169 results on '"Resin adhesive"'
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2. 冷热循环对新型低收缩树脂粘接剂粘接性能的影响.
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王宗华, 张晓冉, 姚烁, 赵家鑫, 周传健, and 吴峻岭
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THERMOCYCLING ,RESIN adhesives ,SCANNING electron microscopes ,EPOXY resins ,EXPERIMENTAL groups - Abstract
Copyright of West China Journal of Stomatology is the property of Sichuan University, West China College of Stomatology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
- Published
- 2023
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3. Research progress on nano-calcium phosphate modified dental materials for the prevention and treatment of dental pulp diseases
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HUANG Yannan and CHENG Lei
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nanometer calcium phosphate ,dental materials ,material modification ,pit-and-fissure sealant ,composite resin ,resin adhesive ,root canal sealant ,dental decay ,dental pulp disease ,oral microorganisms ,Medicine - Abstract
Nanomaterials usually refer to tiny particles with a diameter of 1-100 nm, which often have unique physicochemical properties and are one of the main areas of research interest for development of dental biomaterials. Nano-calcium phosphate modified dental materials have been widely used in pit and fissure sealing, dental resin restoration, tooth adhesion, and root canal sealing. The current research shows that the dental material modified by nano-calcium phosphate has stronger mechanical properties and shows long-term calcium and phosphorus ion release and excellent ion recharging ability, which can promote the remineralization of tooth hard tissue and has good prospects for application. However, it is difficult to accurately simulate the complex environment of the oral cavity. Therefore, the biocompatibility, cytotoxicity and effect of clinical application of nano-calcium phosphate modified dental materials still needs further study. This review summarizes and discusses the recent research progress regarding nano-calcium phosphate modified dental materials in the prevention and treatment of dental pulp diseases. more...
- Published
- 2021
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4. Evaluation of the effects of three pretreatment conditioners and a surface preparation system on the bonding durability of composite resin adhesive to a gold alloy.
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Hiroaki YANAGIDA, Naomi TANOUE, Kanako HODATE, Koichi MURAGUCHI, Asami UENODAN, Yoshito MINESAKI, and Hiroyuki MINAMI
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GOLD alloys ,SURFACE preparation ,RESIN adhesives ,DENTAL cements ,BOND strengths ,COATINGS industry ,ADHESIVES industry - Abstract
This study aimed to evaluate the effect of three pretreatment conditioners and surface preparations on a composite resin adhesive for a gold alloy. Cast disk specimens were made and bonded with RelyX Unicem luting agent under six surface conditions: 1) polished with No.600 carbide paper, 2) air-abraded with alumina, 3) Alloy Primer metal conditioner was applied after alumina-abrasion, 4) Monobond Plus multipurpose conditioner was applied after alumina-abrasion, 5) M. L. Primer metal conditioner was applied after alumina-abrasion, and 6) Rocatec multipurpose silica-coating system was applied. The bond strengths were determined before and after thermocycling (50,000 cycles). The bond strengths of the alumina-abrasion group were significantly decreased after thermocycling. The Rocatec and M. L. Primer exhibited higher bond strengths than other treatments. The application of metal conditioners and multipurpose surface preparations was recommended for improved bonding between the evaluated adhesive resin and gold alloy. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
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5. 多余树脂粘接剂清除方法对不同边缘间隙全瓷冠边缘完整性的影响.
- Author
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张海洋, 刘建彰, 阚 娜, 李红霞, 王俊丰, 姜海巍, 邱澄宇, and 肖 震
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RESIN adhesives , *DENTAL crowns , *SCANNING electron microscopes , *DENTAL adhesives , *AUTOMATION , *DENTIN - Abstract
BACKGROUND: There are many studies on the marginal integrity of all ceramic crowns with different resin adhesives, or different shoulder, different polymerization angles, but there is no research on whether different methods of redundant bonding will affect the marginal integrity of all ceramic crowns. OBJECTIVE: To analyze the effect of removing excess resin adhesive on the marginal integrity of all ceramic crowns with different marginal gaps. METHODS: Totally 40 extracted third molars were prepared with all ceramic crowns and randomly divided into groups A, B, C, and D (10 teeth in each group). After the model scanning was completed, the edges of restoration in groups A, B and C were lifted at 30, 60 and 90 µm respectively by computer control, while those in group D were not raised. Procera alumina CAD-CAM all ceramic crowns were made. Then, the four groups of groups A, B, C and D were randomly divided into two subgroups. In one subgroup, a large amount of excess resin adhesive was removed with a small brush, and then the light was illuminated for 40 seconds after the full crown bonding. Subsequently, a small amount of resin adhesive was scraped off with sickle scalpel (small brush group). The sample in the other subgroup was exposed to light for 2 seconds, scraped off with sickle scalpel, and then illuminated for 40 seconds (sickle group). The marginal integrity and surface quality of the adhesive were observed by scanning electron microscope. RESULTS AND CONCLUSION: (1) Scanning electron microscope showed that the continuity of the bonding interface was better in the small brush group. Different degrees of adhesive defects were found in the sickle group. Under the same marginal gap, the defect rate of cement in the small brush group was lower than that in the sickle group (P < 0.05). Under the same adhesive removal method, there was no significant difference in the defect rate of cement between groups A, B, C, and D (P > 0.05). (2) Results indicate that the method of using small brush to remove excess adhesive, then lighting for 40 seconds, and finally using sickle scalpel to remove the remaining small amount of adhesive is more suitable for clinical practice. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
6. Synthesis and characterization of new hydrolytic-resistant dental resin adhesive monomer HMTAF
- Author
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Nattawut Decha, Supitcha Talungchit, Panata Iawsipo, Arthit Pikulngam, Piangkwan Saiprasert, and Chittreeya Tansakul
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methacrylamide ,quaternary ammonium salt ,resin adhesive ,hydrolytic resistance ,antibacterial monomer ,Polymers and polymer manufacture ,TP1080-1185 - Abstract
Hydrolytic and enzymatic degradation of resin adhesives over time has been mainly attributed to secondary caries formation of methacrylate-based tooth-colored resin-based composite restorations. Ability of resin adhesive monomers to infiltrate into demineralized dentin forming stiff polymer matrix and potentially bonding to tooth structure is also a crucial property. The only commercially available antibacterial monomer, 12-methacryloyloxydodecyl pyridinium bromide (MDPB), is a quaternary ammonium methacrylate. This methacrylate monomer undergoes hydrolytic degradation, and could not bond to tooth structure. In this study, a new hydrolytic resistant monomer HMTAF was synthesized. It is methacrylamide-based monomer that, unlike methacrylate, is highly resistant to hydrolysis. Its molecular structure has particular functional groups; quaternary ammonium fluoride salt with potential antibacterial fluoride-releasing activity, hydroxyl and amide group with hydrogen bonding potential to dentin collagen. Hydroxyl group also increases monomer hydrophilicity for better penetration into water-saturated dentin and sufficient resin-dentin bond. The synthesized HMTAF and its polymer showed no hydrolytic degradation in acidic environment, while MDPB and its polymer were partially decomposed under this challenge. The conversion of monomer HMTAF to polymer was illustrated by FT-IR. The results indicated that HMTAF is highly resistant to hydrolysis, polymerizable and non-cytotoxic to Vero cell lines. It is a potential monomer to be incorporated into resin adhesives for improving hydrolytic and enzymatic resistance. more...
- Published
- 2019
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7. Kleben bis das Zeug hält – Experimente zu historischen Klebstoffen.
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Schälte, Miriam and Lück, Gisela
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RESIN adhesives , *SCIENCE projects , *INTERMOLECULAR interactions , *ADHESIVES , *GLUE - Abstract
Adhesives have been used by mankind for several millennia. Initially used in the creation of tools and hunting weapons, they can nowadays be found in almost all branches of industry and everyday life. This article presents three experiments on some of the most ancient adhesives: birch pitch, resin adhesives, and animal glue. They can be conducted in chemistry and science classes of secondary and primary schools and especially in school science clubs or projects in order to discuss intermolecular interactions. In addition to the experiments, this article gives an illustration of the physicochemical and historical background of adhesives. [ABSTRACT FROM AUTHOR] more...
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- 2020
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8. Evaluation of 2 thione primers and 3 resin adhesives for silver-palladium-copper-gold alloy bonding.
- Author
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Koishi, Yoshikazu, Tanoue, Naomi, Yanagida, Hiroaki, Atsuta, Mitsuru, Nakamura, Mitsuo, and Matsumura, Hideo
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DENTAL bonding ,SILVER alloys ,COPPER alloys ,PALLADIUM alloys ,GOLD alloys ,DENTAL metallurgy ,DENTAL resins - Abstract
Objective: The purpose of this study was to evaluate 2 thione primers and 3 resin adhesives for enhancement of bonding strength to a silver-palladium-copper-gold alloy. Method and Materials: Two different sized disk specimens (10- and 8-mm diameter by 2.5-mm thick) were prepared from a silver-palladium-copper-gold alloy (Castwell MC. 12, GC). The specimens were airborne-particle abraded with 50-μm-grain alumina, conditioned either with a thiouracil primer (Metaltite, Tokuyama Dental) or with a triazine dithione primer (V-Primer, Sun Medical), and then bonded with 1 of 3 acrylic resins: a benzoyl peroxide-amine redox-initiated resin adhesive (Multi-Bond, Tokuyama Dental) or a tri-n-butylborane-initiated resin adhesive (Super-Bond C&B and Super-Bond Quick, Sun Medical). For each adhesive, unprimed specimens were prepared as experimental controls. Shear bond strength was determined after thermocycling (100,000 cycles). Results: Use of primers significantly (P < .05) enhanced the bond strength of specimens in all adhesives. Irrespective of the type of primer, the strength of Multi-Bond adhesive was significantly (P < .05) lower than that of Super-Bond C&B and Super-Bond Quick adhesives. The strength of the 2 tri-n-butylborane-initiated adhesives did not differ significantly (P> .05). The mean strength of the Super-Bond C&B adhesive was 40.4 MPa with Metaltite and 37.8 MPa with V-Primer; that of Super-Bond Quick adhesive was 40.9 MPa with Metaltite and 36.5 MPa with V-Primer. Conclusion: Use of thione primers effectively enhanced the strength of the bond to the silver-palladium-copper-gold alloy. Furthermore, the combinations of primers and tri-n-butylborane-initiated adhesives were found to be more efficient for bonding. [ABSTRACT FROM AUTHOR] more...
- Published
- 2006
9. Synthesis and characterization of new hydrolytic-resistant dental resin adhesive monomer HMTAF.
- Author
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Decha, Nattawut, Talungchit, Supitcha, Iawsipo, Panata, Pikulngam, Arthit, Saiprasert, Piangkwan, and Tansakul, Chittreeya
- Subjects
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HYDROXYL group , *DENTAL resins , *DENTAL adhesives , *RESIN adhesives , *DENTAL glass ionomer cements , *MONOMERS , *QUATERNARY ammonium salts - Abstract
Hydrolytic and enzymatic degradation of resin adhesives over time has been mainly attributed to secondary caries formation of methacrylate-based tooth-colored resin-based composite restorations. Ability of resin adhesive monomers to infiltrate into demineralized dentin forming stiff polymer matrix and potentially bonding to tooth structure is also a crucial property. The only commercially available antibacterial monomer, 12-methacryloyloxydodecyl pyridinium bromide (MDPB), is a quaternary ammonium methacrylate. This methacrylate monomer undergoes hydrolytic degradation, and could not bond to tooth structure. In this study, a new hydrolytic resistant monomer HMTAF was synthesized. It is methacrylamide-based monomer that, unlike methacrylate, is highly resistant to hydrolysis. Its molecular structure has particular functional groups; quaternary ammonium fluoride salt with potential antibacterial fluoride-releasing activity, hydroxyl and amide group with hydrogen bonding potential to dentin collagen. Hydroxyl group also increases monomer hydrophilicity for better penetration into water-saturated dentin and sufficient resin-dentin bond. The synthesized HMTAF and its polymer showed no hydrolytic degradation in acidic environment, while MDPB and its polymer were partially decomposed under this challenge. The conversion of monomer HMTAF to polymer was illustrated by FT-IR. The results indicated that HMTAF is highly resistant to hydrolysis, polymerizable and non-cytotoxic to Vero cell lines. It is a potential monomer to be incorporated into resin adhesives for improving hydrolytic and enzymatic resistance. [ABSTRACT FROM AUTHOR] more...
- Published
- 2019
- Full Text
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10. Influence of testing conditions on thermal distribution and resulting load-bearing capacity of bonded anchors under fire.
- Author
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Al-Mansouri, Omar, Mege, Romain, Pinoteau, Nicolas, Guillet, Thierry, and Rémond, Sébastien
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R-curves , *FIRE testing , *ANCHORS , *BOND strengths , *HIGH strength steel , *STEEL , *FIRE - Abstract
• Pull-out fire tests on bonded anchors for ISO 843-1 fire. • Bond strength vs. time curve using resistance integration method based on fire tests. • Thermal investigation parameter of pull-out fire tests in the current guidelines. • Analysis of the predicted bond resistance for each parameter. This paper aims to experimentally apply the existing method for evaluating the pull-out capacity of mechanical anchors under fire, to bonded anchors. Due to the absence of sufficient guidelines for evaluating bonded anchors directly exposed to fire, this experimental work studies the influence of the existing evaluation method on the prediction of the bond resistance and failure time. Different testing conditions and possible configurations for anchors in buildings are explored. The studied influencing parameters are: presence of fixtures, insulation of fixtures, thickness of the concrete bearing element, diameter of the anchor, concrete/steel temperature. The influence of each parameter on the predicted bond resistance and failure time, determined with a design method based on resistance integration is studied. Results show that parameters such as concrete element thickness and attaching metallic fixtures on anchors have a negligible influence on the predicted load-bearing capacity and failure time. However, adopting concrete temperature instead of anchor steel temperature in the resistance integration method, and putting insulation around fixtures may lead to a false estimation of the load-bearing capacity and failure time. [ABSTRACT FROM AUTHOR] more...
- Published
- 2019
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11. Application of Simple Notch to Selective Separation of Adherend Bonded With Resin Adhesive by Pulsed Discharge in Air
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Soowon Lim, Taketoshi Koita, Manabu Inutsuka, Satoshi Oyama, Masataka Kondo, Chiharu Tokoro, and Takao Namihira
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Nuclear and High Energy Physics ,Materials science ,Simple (abstract algebra) ,Separation (aeronautics) ,Composite material ,Condensed Matter Physics ,Resin adhesive - Published
- 2021
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12. Substantial in-vitro and emerging clinical evidence supporting immediate dentin sealing
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Heba E. Elsubeihi, Emad S. Elsubeihi, Haitham Elbishari, and Taif Alkhoujah
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Dentin permeability ,Materials science ,business.industry ,Bond strength ,Post-operative sensitivity ,Dentistry ,RK1-715 ,Review Article ,Indirect restoration ,Dentin bonding ,stomatognathic diseases ,medicine.anatomical_structure ,Dentinal Tubule ,Flexural strength ,stomatognathic system ,Clinical evidence ,Ceramic veneers ,Dentin ,medicine ,Adhesive ,business ,General Dentistry ,Resin adhesive ,Immediate dentin sealing - Abstract
The application of resin adhesive to freshly cut dentin after teeth preparation, the so-called immediate dentin sealing (IDS) has been suggested as an alternative to the delayed dentin sealing (DDS), a technique in which resin adhesive is applied just before final bonding of indirect restorations. The aim of this review is to demonstrate the evidence of the claimed advantages made by the proponents of IDS technique. The results of this review revealed substantial in-vitro evidence supporting the IDS benefits including improved bond strength, reduced dentin permeability, improved restorations' adaptation, and increased fracture strength of the restorations. Clinical studies have shown that IDS improves survival of ceramic laminate veneers bonded to prepared teeth with increased exposure of dentin. Moreover, it has been shown that IDS reduces post-cementation hypersensitivity in full coverage restorations, which is characterized by exposure of a large number of dentinal tubules. The selection of filled resin adhesive that is capable of producing thick adhesive layer appears to contribute to the success of the technique. Furthermore, careful management of the oxygen inhibition layer before conventional impression making and proper cleaning of the residual temporary cement used with provisional restorations appears to affect the outcome of the restorations. more...
- Published
- 2021
13. Effect of Caries Removal Methods on the Shear Bond Strength of Resin and Glass IonomerAdhesives to Primary Dentin
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Mohammadi N, Ferooz M, Eskandarian T, and Bagheri R
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Primary Dentin ,Carisolv ,Resin Adhesive ,Resin Modified Glass ,Ionomer Adhesive ,Technology ,Dentistry ,RK1-715 - Abstract
Statement of Problem: There is no enough published data about the shear bond strength of resin modified glass ionomer adhesives on caries-affected primary tooth dentin excavated using minimally invasive systems. Objectives: To evaluate the shear bond strength of 2 different adhesives (one resin modified glass ionomer and one resin) using two caries removal tech- niques on healthy and caries-affected primary dentin. Materials and Methods: Two caries removal methods including mechanical (handpiece) and chemomechanical (Carisolv) techniques and two types of ad- hesives including one resin adhesive (Clearfil SE Bond; CSEB, Kuraray) and one resin-modified glass ionomer adhesive (Riva Bond LC; RBLC, SDI) were used in this study. Ten extracted healthy primary teeth were used for the control group. The teeth were sectioned bucco-lingually and mesio-distally in order to obtain four specimens from each tooth. Thirty suitable specimens were selected as the “control” and randomly divided into two groups of “sound dentin” based on the type of the adhesive used. Sixty extracted caries affected teeth were used for the carious group; sectioned as mentioned above and sixty suitable specimens were selected as the “treatment”. Then the specimens were arbitrarily divided into four groups based on caries removal techniques and the type of ad- hesive used (n = 15). After bonding with either CSEB or RBLC, the specimens were restored with a resin composite by means of PVC tubes and subjected to the shear bond strength test. The data was analyzed using ANOVA and Tukey’s test. Results: The specimens in Carisolv group bonded with CSEB (11.68 ± 3.1) showed a statistically significant higher mean bond strength followed by those in handpiece group bonded with CSEB (9.4 ± 2.7), which exhibited higher mean values than those groups with RBLC (p < 0.05). Shear bond strength values for Clearfil SE Bond was not significantly higher than Riva Bond LC when used in sound dentin. Conclusions: The lowest shear bond strengths for both adhesives were observed on caries-free dentin. more...
- Published
- 2015
14. PENGARUH BERBAGAI KONDITIONER DENTIN (ASAM PHOSPHAT) TERHADAP KEKUATAN TARIK ANTARA ADHESIVE RESIN (HNPM/TEGDMA) DENGAN JARINGAN DENTIN
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Andi Soufyan, B. Irawan, G. Gunadi, and Ali Nurdin
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dentin conditioner ,resin adhesive ,Dentistry ,RK1-715 - Abstract
The aim of this research is to see the effect of various dentin conditioners (phosphoric acid) to the bond strength between resin adhesive HNPM/TEGDMA (2 Hydroxy-3,2-Napthoxy-Propyl Methacrylate/Trietilen Glokol di Methacrylate) and dentin tissue of bovine teeth. Dentin conditioner that was used are phosphoric acid solution 10% 25%, 35% (Group A1, A2, A3). Specimens was divided into 3 groups, each group has 10 specimens. Bond strength test used "Universal Testing Machine" AG 5000 and SHIMADZU type. The result of this research shows average differences of bond strength of each group. Anova test there is a significant difference (8.545 and p2 and A3 group. The result of the research stated there are effects of various dentin conditioners to the bond strength between resin adhesive HNPM/TEGDMA and dentin tissue. more...
- Published
- 2015
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15. Influence of adhesive-composite application modalities on their bonding to tooth structure and resistance of the performed restorations to failure.
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Abdelaziz, Khalid M. and Saleh, Ahmed A.
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BOND strengths ,SHEAR strength - Abstract
Abstract Background/purpose The longevity of bonded composite restorations could be affected by the utilized adhesive-composite application techniques. This in vitro study aimed to evaluate the influence of adhesive-composite application modalities on their bonding values to tooth structure and on the failure resistance of the performed restorations on loading. Materials and methods Resin composite studs, 2 mm in diameter and 4 mm high, were bonded in 2 groups to flattened enamel and dentin surfaces of 80 extracted premolars using pre-cured (PC) and co-cured (CC) self-etch resin adhesive. Studs in each group were built-up in 4 subgroups using either multiple increments of nano-filled composite (IF, control) or single increment of preheated nano-filled (PH), bulk-fill (BF) and sonic-activated bulk-fill composites (SF). Another 80 premolars with standard class II cavities were also restored using the same adhesive-composite application modalities. All specimens were then stressed on a universal testing machine to assess the composite-tooth shear bond strength and the resistance of the performed restorations to failure. The modes of specimens' failure were also assessed following each test. Results The PC adhesive provided higher bond strength to dentin (p < 0.05) and comparable bond strength to enamel in comparison to the CC one (p>0.05%). Both PH and BF composites showed lower bond strength to dentin in presence of PC adhesive (p < 0.05). Comparable bond strengths were noticed for PH, BF and SF composites to dentin in presence of CC adhesive (p > 0.05). PH and SF restorations presented the highest resistance to failure (p < 0.05). Conclusion Both incrementally and bulky-inserted composites offer clinically acceptable bond strength in presence of pre-cured resin adhesive. Both Preheated and sonic-activated composite restorations offer the highest resistance to failure on loading. The preheating procedure renders regular composite material suitable for bulk-fill applications. [ABSTRACT FROM AUTHOR] more...
- Published
- 2018
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16. 三种树脂粘接剂对纯氧化铝粘接强度的影响.
- Author
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王柳力, 郭欣, 魏天骄, 廖国婷, and 冯剑桥
- Subjects
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SILANE coupling agents , *SCANNING electron microscopes , *SHEAR strength , *RESIN adhesives , *FAILURE mode & effects analysis - Abstract
Objective: The shear strength of three resin adhesives and pure alumina veneers was determined by sandblasting, silica hydrothermal heat treatment and silane coupling agent. After the surface treatment, the shear strength of three kinds of resin adhesives and pure alumina was determined. Methods: Thirty cases of the high purity α-Al2O3 pure alumina specimens were randomly divided into three groups: group A(SACTM resin adhesive), group B(Vorilink N resin adhesive), group C(RelyXTM Unicem adhesive), with 10 cases in each group. After bonding with the specimen, the shear adhesive strength was tested after incubation at 37 ℃ for 24 hours. The failure modes of the bonding interface of each specimen were observed under scanning electron microscope. Results: The bonding strength of SAC resin adhesive was(25.91±2.97), which was the highest in the hree kinds of resin adhesives(P<0.05) and was higher than that of Vorilink N(18.37±2.11) and RelyXTM Unicem was(9.98±1.22)(P<0.05). Group A was mixed for all, Group B had internal damage to the adhesive. Group C had both damage and interface damage and internal damage of the adhesive. Scanning electron microscopy showed that there were many resin residues in the adhesive cross section of group A and B, the residual resin on group C was few. Conclusion: Different resin adhesives had an effect on the bonding strength of pure alumina specimens. The SACTM adhesive had the best bonding effect. [ABSTRACT FROM AUTHOR] more...
- Published
- 2018
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17. Improving the durability of resin-dentin bonds with an antibacterial monomer MDPB.
- Author
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Masanori HASHIMOTO, Nanako HIROSE, Haruaki KITAGAWA, Satoshi YAMAGUCHI, and Satoshi IMAZATO
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DENTAL resins ,DENTIN ,BOND strengths ,MONOMERS ,ANTIBACTERIAL agents ,BROMIDES - Abstract
The 12-methacryloxydodecylpyridium bromide (MDPB) has been reported to act as a matrix metalloprotease (MMP) inhibitor. In this study, the effects of application of MDPB on resin-dentin bonds were evaluated. The resin-dentin bonded specimens were prepared with a commercial MDPB-containing self-etching primer or a self-etching primer without MDPB, and stored 24 h or 1 year. Surfaces were pretreated with chlorhexidine or MDPB-containing cavity disinfectant. Additionally, we compared the degradation patterns between the two self-etching adhesives and etch and rinse system. Water tree formations were observed as the typical morphological phase of the two tested self-etching adhesives for both 24 h and 1 year groups. The degradation phase of collagen network depletion was observed in the adhesive interface of the etch-and-rinse system in the 1 year group. Pretreatment with chlorhexidine did not prevent bond strength reduction after 1 year. The cavity disinfectant improved the bond durability for the self-etching adhesive. [ABSTRACT FROM AUTHOR] more...
- Published
- 2018
- Full Text
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18. Influence of graphene oxide filler content on the dentin bond integrity, degree of conversion and bond strength of experimental adhesive. A SEM, micro-Raman, FTIR and microtensile study
- Author
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Mohammed S Bin-Shuwaish, Ahmed M Maawadh, Rana S Al-Hamdan, Saad Alresayes, Thamer Ali, Basil Almutairi, Fahim Vohra, and Tariq Abduljabbar
- Subjects
graphene oxide ,dentin bond ,resin adhesive ,degree of conversion ,Micr-Raman Spectroscopy ,bond strength ,Materials of engineering and construction. Mechanics of materials ,TA401-492 ,Chemical technology ,TP1-1185 - Abstract
The study aimed to evaluate the effect of graphene oxide (GO) nano-filler content in experimental dental adhesive on its degree of conversion (DC), microtensile bond strength ( μ TBS) and structural reliability, using Fourier transform infrared spectroscopy (FTIR), Micro-Raman spectroscopy and Scanning electron microscopy (SEM). A resin adhesive was fabricated (control adhesive - CA) and fabricated GO nano-particles were added at 0.5% and 2.0% (m/m) to produce adhesives GOA1 and GOA2 respectively. One hundred and two teeth (specimens) were prepared for dentin exposure and conditioned with 36% phosphoric acid. Specimens in each group (n = 34) were treated with formulated adhesives (CA, GOA1 & GOA2) and photo-polymerized for 20 s followed by composite build up. Sixty specimens were used for μ TBS testing in the adhesive groups (CA, GOA1 & GOA2), with half exposed to thermocycling (TC) whereas the remaining half (n = 10) stored in distilled water. Seven specimens each were assessed using SEM and Micro-Raman spectroscopy, in each adhesive group (n = 7). DC for the adhesives was assessed using FTIR. The means of μ TBS and DC were analyzed using ANOVA and post hoc Tukey multiple comparisons test. GO nano-filler content showed significant influence on the adhesive μ TBS in comparison to controls (p < 0.01). Ageing (TC) revealed significant reduction in the μ TBS, except in GOA2 specimens, which showed comparable outcomes among TC and non-TC specimens (p > 0.05). DC was significantly higher in control adhesive [46.8 (3.6)%] compared to GOA2 [37.7 (4.2)%] specimens, however DC was comparable among GOA1 [42.3 (2.9)%] and GOA2 [37.7 (4.2)%] specimens (p > 0.05) respectively. GO exhibited interaction within adhesive and tooth dentin comparable to control adhesive. Increasing GO content showed increase in μ TBS of adhesive to dentin, but a decrease in degree of conversion. Under ideal conditions, experimental adhesive with 2% GO content showed acceptable bond strength and DC; and should be further assessed under dynamic conditions to recommend clinical use. more...
- Published
- 2020
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19. Microtensile bond strength of TTEMA/TEGDMA remineralizing adhesive to early carious enamel lesions
- Author
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Mon Ghoniem and Moustafa N. Aboushelib
- Subjects
Remineralisation ,Materials science ,Enamel paint ,Bond strength ,Scanning electron microscope ,030206 dentistry ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Apatite ,stomatognathic diseases ,03 medical and health sciences ,0302 clinical medicine ,stomatognathic system ,visual_art ,Calcium content ,visual_art.visual_art_medium ,Adhesive ,Composite material ,0210 nano-technology ,Resin adhesive - Abstract
Objectives: Resin adhesive could be used as a carrier of nano-hyrdoxy apatite particles added to treat early enamel caries. The aim of this study was to evaluate microtensile bond strength of a remineralizing enamel infiltrant to early carious enamel lesion. Methods: An artificial caries model was used to induce early partially-cavitated enamel caries-like lesion in maxillay centrals. Nano hydroxyapatite particles (nHA) were applied in two forms to a low shrinkage low viscosity resin adhesive: particles were directly added to resin adhesive or silanated before addition. Unmodified ad-hesive was used as control. Micro-tensile bond strength (MTBS) was performed to evaluate bond strength to demineralized enamel after application of the remineralizing resin adhesive (n=20, α=0.05). Scanning electron microscopy (SEM) was performed to assess mode of failure and to study infiltrant-enamel interface. Results: Direct addition of nano-particles resulted in significant reduction (F=32, P more...
- Published
- 2020
- Full Text
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20. Acoustical properties of wood fiberboards prepared with different densities and resin contents
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Se-Hwi Park, Eun-Chang Kang, Pureun-Narae Seo, Chun-Won Kang, and Min Lee
- Subjects
0106 biological sciences ,Environmental Engineering ,Materials science ,Mixing (process engineering) ,Bioengineering ,Fiberboard ,01 natural sciences ,Flexural strength ,010608 biotechnology ,visual_art ,Attenuation coefficient ,visual_art.visual_art_medium ,Composite material ,Porosity ,Waste Management and Disposal ,Resin adhesive - Abstract
The demand for noise control in residential environments is steadily increasing, but the currently available noise-reducing materials used in walls and floors are unsustainable and expensive. As an alternative, wood-fiber could be a good resource to manufacture eco-friendly acoustic materials. In this study, fiberboards were prepared by mixing wood-fibers (Pinus densiflora) with melamine-urea-formaldehyde resin adhesive, obtaining specimens with different final densities and resin contents. The acoustic, physical, and morphological properties of the fiberboards were investigated. The sound absorption was greatly influenced by the density of the fiberboard: lower densities showed higher sound absorption performances. Furthermore, the low-frequency absorption coefficient was higher for lower resin contents. The materials met all the criteria required by the Korean standards for fiberboards. As the density increased, the dimensional stability and the bending strength increased; in contrast, the physical properties were not affected by the resin content. Microscopy observations confirmed that specimens with different densities and resin contents had different porosities; the porosity was assumed to be the main property that governs the noise-reducing ability. Due to their eco-friendliness and inexpensiveness, these fiberboards offer themselves as efficient and effective alternative sound-absorbing materials. more...
- Published
- 2020
- Full Text
- View/download PDF
21. Glue till you drop – Experiments on Historical Adhesives
- Author
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Gisela Lück and Miriam Schälte
- Subjects
Polymer science ,General Medicine ,Animal glue ,Resin adhesive - Abstract
Adhesives have been used by mankind for several millennia. Initially used in the creation of tools and hunting weapons, they can nowadays be found in almost all branches of industry and everyday life. This article presents three experiments on some of the most ancient adhesives: birch pitch, resin adhesives, and animal glue. They can be conducted in chemistry and science classes of secondary and primary schools and especially in school science clubs or projects in order to discuss intermolecular interactions. In addition to the experiments, this article gives an illustration of the physicochemical and historical background of adhesives. more...
- Published
- 2020
- Full Text
- View/download PDF
22. A review: Biodegradation of resin–dentin bonds
- Author
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Masanori Hashimoto, Futami Nagano, Kazuhiko Endo, and Hiroki Ohno
- Subjects
Adhesion ,Hybrid layer ,Degradation ,Electron microscopy ,Polymer ,Resin adhesive ,Dentistry ,RK1-715 - Abstract
Resin–dentin bonding was first achieved through mechanical hybridization between resin and collagen fibrils using a functional monomer containing resin system. In the last decade, new adhesive resin systems were frequently released onto the market within a short-period of time. Before and after commercialization, the bond integrity has been tested by bond tests, and leakage evaluation by researchers, but it is very difficult for clinicians to obtain a comprehensive, up-to-date understanding of their nature and degradation. Although newly developed adhesive resins have attempted to improve the bond strength at least in the first 24 h after bonding, the long-term durability of the bonds has not yet been established analytically. However, numerous recent studies have shown micromorphological evidence of biodegradation of resin–dentin bonds, due to hydrolysis of the resin and collagen fibrils within the bonds. This review mainly summarizes the most recent work in biodegradation of resin–dentin bonds based on micromorphological analyses of data obtained by scanning and transmission electron microscopy. more...
- Published
- 2011
- Full Text
- View/download PDF
23. Effects of thermal cycling on bonding properties of novel low-shrinkage resin adhesive.
- Author
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Wang Z, Zhang X, Yao S, Zhao J, Zhou C, and Wu J
- Subjects
- Dental Cements, Surface Properties, Resin Cements, Dentin-Bonding Agents, Dentin, Materials Testing, Microscopy, Electron, Scanning, Composite Resins, Dental Bonding
- Abstract
Objectives: The current study aimed to investigate the bonding properties of a novel low-shrinkage resin adhesive containing expanding monomer and epoxy resin monomer after thermal cycling aging treatment., Methods: Expanding monomer of 3,9-diethyl-3,9-dimethylol-1,5,7,11-tetraoxaspiro-[5,5] undecane (DDTU) as an anti-shrinkage additive and unsaturated epoxy monomer of diallyl bisphenol A diglycidyl ether (DBDE) as a coupling agent were synthesized. A blend of DDTU and DBDE at a mass ratio of 1∶1, referred to as "UE", was added into the resin matrix at the mass fraction of 20% to prepare a novel low-shrinkage resin adhesive.Then, the methacrylate resin adhesive without UE was used as the blank control group, and a commercial resin adhesive system was selected as the commercial control group. Moreover, the resin-dentin bonding and micro-leakage testing specimens were prepared for the thermal cycling aging treatment. The bonding strength was tested, the fracture modes were calculated, the bonding fracture surface was observed by scanning electron microscope (SEM), and the dye penetration was used to evaluate the tooth-restoration marginal interface micro-leakage. All the data were analyzed statistically., Results: After aging, the dentin bonding strength of the experimental group was (19.20±1.03) MPa without a significant decrease ( P >0.05), that of the blank control group was (11.22±1.48) MPa with a significant decrease ( P <0.05) and that of the commercial control group was (19.16±1.68) MPa without a significant decrease ( P >0.05). The interface fracture was observed as the main fracture mode in each group after thermal cycling by SEM. The fractured bonding surfaces of the experimental group often occurred on the top of the hybrid layer, whereas those of the blank and commercial control groups mostly occurred on the bottom of the hybrid layer. Micro-leakage rating counts of specimens before and after thermal cycling were as follows: the experimental group was primarily 0 grade, thereby indicating that a relatively ideal marginal sealing effect could be achieved ( P >0.05); meanwhile, the blank control group was primarily 1 grade, and the penetration depth of dye significantly increased after thermal cycling ( P <0.05); the commercial control group was primarily 0 grade without statistical difference before and after thermal cycling ( P >0.05), while a significant difference was observed between the commercial control group and experimental group after thermal cycling ( P <0.05)., Conclusions: The novel low-shrinkage resin adhesive containing 20%UE exhibited excellent bonding properties even after thermal cycling aging treatment, thereby showing a promising prospect for dental application. more...
- Published
- 2023
- Full Text
- View/download PDF
24. 生物活性玻璃改性树脂粘接剂对牙本质脱矿及 树脂粘接强度的影响.
- Author
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王瑜, 龚玲, 计艳, 郑丽纯, and 陈嵩
- Abstract
Copyright of West China Journal of Stomatology is the property of Sichuan University, West China College of Stomatology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
- Published
- 2016
- Full Text
- View/download PDF
25. Longevity of resin-bonded fixed partial dental prostheses made with metal alloys.
- Author
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Tanoue, Naomi
- Subjects
- *
DENTURES , *DENTAL resins , *DENTAL metallurgy , *DENTAL cements , *DEBONDING , *DENTISTRY - Abstract
Objectives: The purpose of this study was to evaluate the clinical performance of resin-bonded fixed partial dental prostheses (RBFPDPs) made with metal alloys. Materials and methods: The retention of 311 RBFPDPs from 226 patients fabricated from 1983 to 2013 using an adhesive resin was clinically evaluated. Partial or complete debonding of the RBFPDP or framework fracture was considered a treatment failure. All data were obtained from clinical examinations, and missing data were censored at the date of the last available information. The effect of the following factors on survival rate were investigated: patient gender, location (maxilla/mandible and anterior/posterior), number of missing teeth, number of abutment teeth, framework structure, type of metal alloy, patient age at the point of cementation, cement type, and distinction of the treating dentist. Data were analyzed with the Kaplan-Meier survival tests, log-rank tests, and Cox regression analyses ( α = 0.05). Results: The Kaplan-Meier survival rate was 41.2 % ± 6.5 % (standard error) at 28.8 years (last outcome event). Significant differences were found for patient age and treating dentist ( p < 0.05). The risk of failure in younger patients was 1.7 times greater than that in older patients and that of inexperienced dentists was 2.0 times greater than that of dentist experienced and specialized in adhesive dentistry. Conclusions: When fabricating RBFPDPs for younger patients, mechanical preparation for bonding may be necessary in consideration of the risk for debonding. Experienced dentists may achieve better results. Clinical relevance: Mastery of skills is necessary to ensure excellent prognoses for RBFPDPs. [ABSTRACT FROM AUTHOR] more...
- Published
- 2016
- Full Text
- View/download PDF
26. FEM analysis on combined bond-cone fracture of a post-installed adhesive anchor filled with UHPFRC
- Author
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Kiyoshi Murakami, Ayumi Satoh, and Koji Takeda
- Subjects
Cement ,Materials science ,Applied Mathematics ,Mechanical Engineering ,0211 other engineering and technologies ,02 engineering and technology ,Epoxy ,Condensed Matter Physics ,Finite element method ,Anchor bolt ,020303 mechanical engineering & transports ,0203 mechanical engineering ,visual_art ,Fracture (geology) ,visual_art.visual_art_medium ,General Materials Science ,Adhesive ,Composite material ,Resin adhesive ,021101 geological & geomatics engineering ,Interfacial bond - Abstract
This paper is focused on the improvement of a post-installed adhesive anchor for repairing concrete structures. The weakest point of a conventional adhesive anchor is epoxy resin for the adhesive, which suffers from quick degradation due to the environmental burden. An adhesive anchor is developed, where the adhesive is a cement-based material. Previous studies have shown that the most important point of a cement-based adhesive is the interfacial bond properties, and therefore this is the main focus in this study. An experimental pull-out test and finite element model (FEM) analysis are conducted in order to examine the fracture process and the pull-out capacity of a post-installed adhesive anchor bonded with ultrahigh-performance fiber-reinforced concrete (UHPFRC). The experimental results show that the UHPFRC adhesive anchor has an equal pull-out capacity to that of the resin adhesive anchor, but it has a special fracture mode (combined bond-cone fracture). The FEM analysis results reveal that the fracture process is triggered by debonding at the bottom of the anchor. Improving the interfacial properties between anchor bolt and UHPFRC adhesive can make the UHPFRC adhesive anchor 40–50% stronger than the resin adhesive anchor. more...
- Published
- 2019
- Full Text
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27. Calcium carbonate modified urea-formaldehyde resin adhesive for strength enhanced medium density fiberboard production
- Author
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Yan Qing, Supeng Wang, Xingong Li, Yiqiang Wu, Liu Ming, Yan Wang, Li Lu, Shoulu Yang, and Li Tianhua
- Subjects
Materials science ,General Chemical Engineering ,Gel time ,Urea-formaldehyde ,technology, industry, and agriculture ,Formaldehyde ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,chemistry.chemical_compound ,Viscosity ,Calcium carbonate ,stomatognathic system ,chemistry ,Chemical engineering ,Internal bonding ,0210 nano-technology ,Medium density fiberboard ,Resin adhesive - Abstract
This study investigated the improved properties of calcium carbonate (CaCO3) modified urea–formaldehyde (UF) resin adhesive for medium density fiberboard (MDF) production. The CaCO3 modified UF resins were prepared by adding different proportions of CaCO3 to a low molar ratio UF resin at the initial stage of a typical synthetic process of the resin. The physicochemical properties of the resins were measured. The mechanical and environmental performances of the resin-bonded MDF panels were tested. The results show that the viscosity and free formaldehyde content of UF resins with or without CaCO3 modification were not significantly different. The solid content of the CaCO3 modified UF resin was significantly lower than that of the control group. In addition, the measured gel time of the CaCO3 modified UF resin was 111–149 s, which was longer than that of the control resin (82 s). The gel time was further extended with the increase of the CaCO3 content in the UF resin. The chemical group and crystal structure of UF resins with or without the modification of CaCO3 were not significantly different. The internal bonding (IB) strength of the MDF panels significantly increased from 0.75 MPa to 0.97 MPa when the UF resin was modified with 2% of CaCO3. This study provides scientific support for the preparation of inorganic mineral modified UF resins for strength enhanced wood-based panel manufacturing. more...
- Published
- 2021
28. Mechanical Properties Assessment of Laminated Veneer Lumber from Teak Plantation in Laos
- Author
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Latsamy Boupha, Khanxay Khammanivong, Fu Yu, Khamtan Phonetip, Khonethong Soukphaxay, and Lothim Saetern
- Subjects
Multidisciplinary ,Materials science ,Forest plantation ,medicine.medical_treatment ,Laminated veneer lumber ,Young's modulus ,Bending ,symbols.namesake ,Flexural strength ,medicine ,symbols ,Veneer ,Composite material ,Resin adhesive - Abstract
The objective of this study was to investigate the most influenced levels of pressure and length of time on modulus of rupture (MOR) and modulus of elasticity (MOE) of teak laminated veneer lumber (LVL). Teak LVL was taken from the Faculty of Forestry’s forest plantation in Vientiane, Laos. The peeled veneer’s thickness was 2.3 mm. The veneer was air-dried until the moisture content reached the range of 6 to 10 %. Teak LVL panels were assembled from 9-ply panels of veneer using PL116- Liquid phenol-formaldehyde resin adhesive. The temperature was at 120 °C at 3 different pressure levels i.e., 1.5, 2 and 2.5 MPa and levels of time i.e. 9, 11 and 13 min. The experiment was conducted based on ISO16978. Intron Machine Model 5569 was used for the bending test of LVL with a dimension of 20×20×360 mm3. The bending test results on teak LVL showed significantly different MOR and MOE based on length of time and pressure levels of pressing. more...
- Published
- 2021
- Full Text
- View/download PDF
29. Polycarboxylated microfillers incorporated into light-curable resin-based dental adhesives evoke remineralization at the mineral-depleted dentin.
- Author
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Wang, Zhejun, Shen, Ya, Haapasalo, Markus, Wang, Jiao, Jiang, Tao, Wang, Yining, Watson, Timothy F., and Sauro, Salvatore
- Subjects
- *
DENTAL resins , *DENTAL adhesives , *CARBOXYLATES , *REMINERALIZATION (Teeth) , *BIOACTIVE compounds , *CALCIUM silicates , *FOURIER transform infrared spectroscopy - Abstract
This study aimed at evaluating the remineralizing properties of three experimental light-curable resin-based dental adhesives containing tailored polycarboxylated microfillers. A co-monomers blend was firstly formulated and then mixed with each of the following microfillers: polycarboxylated bioactive glass (PBAG), polycarboxylated calcium silicates (PCS), and polycarboxylated calcium silicates-doped brushite (PDP). The three experimental and a filler-free control resins were applied onto 10% orthophosphoric acid treated dentin discs and light cured. The specimens were soaked in artificial saliva (AS) for 3, 7, and 14 days. Dentin mineral variation was monitored using attenuated total reflection-Fourier transform infrared (ATR-FTIR) and Raman spectroscopy. Confocal laser scanning microscopy (CLSM) was employed to observe the ultra-morphology/nanoleakage along the resindentin interface. The bonding ability and the durability of the resin-dentin bonds were investigated through microtensile bond strength (μTBS) test. ATR-FTIR and Raman showed a significant increase of the mineral matrix area ratio and phosphate peak intensity in specimens treated with the experimental resins within 14 days (p<0.05). No significant increment of minerals was found in untreated specimens or specimens treated using the control filler-free resin (p>0.05). Dentin treated using PBAG or PCS exhibited higher level of remineralization than the specimens in PDP group. CLSM showed reduction in nanoleakage, although the remineralization of the hybrid layer induced a significant drop in the μTBS after 3-month storage (p<0.05). The experimental resin-based dental adhesives containing bioactive microfillers remineralize the resin-dentin interfaces when in intimate contact with biological fluids. [ABSTRACT FROM AUTHOR] more...
- Published
- 2014
- Full Text
- View/download PDF
30. Influence of adhesive-composite application modalities on their bonding to tooth structure and resistance of the performed restorations to failure
- Author
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Khalid M. Abdelaziz and Ahmed A Saleh
- Subjects
Materials science ,0206 medical engineering ,Composite number ,Resin adhesive ,02 engineering and technology ,03 medical and health sciences ,0302 clinical medicine ,stomatognathic system ,Resin composite ,Dentin ,medicine ,Curing ,Composite material ,General Dentistry ,Curing (chemistry) ,Bond strength ,Universal testing machine ,Failure resistance ,Enamel paint ,030206 dentistry ,020601 biomedical engineering ,lcsh:RK1-715 ,medicine.anatomical_structure ,visual_art ,lcsh:Dentistry ,visual_art.visual_art_medium ,Original Article ,Adhesive - Abstract
Background/purpose: The longevity of bonded composite restorations could be affected by the utilized adhesive-composite application techniques. This in vitro study aimed to evaluate the influence of adhesive-composite application modalities on their bonding values to tooth structure and on the failure resistance of the performed restorations on loading. Materials and methods: Resin composite studs, 2 mm in diameter and 4 mm high, were bonded in 2 groups to flattened enamel and dentin surfaces of 80 extracted premolars using pre-cured (PC) and co-cured (CC) self-etch resin adhesive. Studs in each group were built-up in 4 subgroups using either multiple increments of nano-filled composite (IF, control) or single increment of preheated nano-filled (PH), bulk-fill (BF) and sonic-activated bulk-fill composites (SF). Another 80 premolars with standard class II cavities were also restored using the same adhesive-composite application modalities. All specimens were then stressed on a universal testing machine to assess the composite-tooth shear bond strength and the resistance of the performed restorations to failure. The modes of specimens’ failure were also assessed following each test. Results: The PC adhesive provided higher bond strength to dentin (p 0.05%). Both PH and BF composites showed lower bond strength to dentin in presence of PC adhesive (p 0.05). PH and SF restorations presented the highest resistance to failure (p more...
- Published
- 2018
31. Practical relationship between apparent viscosity and molecular weight of urea-formaldehyde resin adhesives
- Author
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Bora Jeong and Byung-Dae Park
- Subjects
Materials science ,Urea-formaldehyde ,Composite number ,technology, industry, and agriculture ,Mark–Houwink equation ,030206 dentistry ,02 engineering and technology ,Surfaces and Interfaces ,General Chemistry ,Adhesion ,Apparent viscosity ,021001 nanoscience & nanotechnology ,complex mixtures ,Surfaces, Coatings and Films ,03 medical and health sciences ,chemistry.chemical_compound ,Viscosity ,0302 clinical medicine ,chemistry ,Mechanics of Materials ,Materials Chemistry ,Adhesive ,Composite material ,0210 nano-technology ,Resin adhesive - Abstract
The proper viscosity of urea-formaldehyde (UF) resin adhesive for optimum adhesion depends on the type of a raw wood material for wood-based composite panels. This study investigated the practical ... more...
- Published
- 2018
- Full Text
- View/download PDF
32. Catalytic and ortho-directing effect of Zn2+, Mg2+, Ba2+, and Ca2+ metal hydroxides on the preparation of phenolic-formaldehyde resin
- Author
-
Yuhe Chen, Hanjiang Cai, Jian Han, Rencong Guo, Chen Zhangmin, He Sheng, Jingpeng Li, and Yanhong Pan
- Subjects
inorganic chemicals ,0106 biological sciences ,Materials science ,Formaldehyde ,One-Step ,Surfaces and Interfaces ,General Chemistry ,010501 environmental sciences ,01 natural sciences ,Surfaces, Coatings and Films ,Catalysis ,Metal ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,010608 biotechnology ,visual_art ,Materials Chemistry ,visual_art.visual_art_medium ,Organic chemistry ,Phenol ,Resin adhesive ,0105 earth and related environmental sciences - Abstract
A one step method was employed to prepare PF (phenol-formaldehyde) resin adhesive from phenol and formaldehyde with Zn2+, Mg2+, Ba2+, and Ca2+ hydroxides as catalysts, and the physicochemical prope... more...
- Published
- 2018
- Full Text
- View/download PDF
33. Complete denture fabrication using piezography and CAD-CAM: A clinical report
- Author
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Eun Jin Park, Ai Tokue, Chikahiro Ohkubo, Hidemasa Shimpo, and Tae Hyung Kim
- Subjects
Fabrication ,Materials science ,medicine.medical_treatment ,Dentistry ,Polymethylmethacrylate resin ,CAD ,03 medical and health sciences ,0302 clinical medicine ,Clinical report ,stomatognathic system ,medicine ,Humans ,Denture Design ,Resin adhesive ,Aged, 80 and over ,Denture, Complete ,business.industry ,Neutral zone ,technology, industry, and agriculture ,030206 dentistry ,Printing, Three-Dimensional ,Computer-Aided Design ,Denture base ,Female ,Mouth, Edentulous ,Oral Surgery ,Dentures ,business ,030217 neurology & neurosurgery - Abstract
To provide maxillary and mandibular complete dentures for a patient with severe ridge resorption, the denture space was recorded using the piezography technique. After the piezographic space was scanned, a virtual tooth arrangement and festooning were performed within the space using computer-aided design software. The denture bases were milled from a polymethylmethacrylate resin block using computer-aided manufacturing, and commercially available denture teeth were bonded with resin adhesive. Using the piezography technique described, physiologically appropriate complete dentures were fabricated based on the neutral zone concept. more...
- Published
- 2018
- Full Text
- View/download PDF
34. The effect of margin thickness, degree of convergence and bonding interlayer on the marginal failure of glass-simulated all-ceramic crowns.
- Author
-
Sornsuwan, Tanapon and Swain, Michael V.
- Subjects
DENTAL crowns ,DENTAL ceramics ,BIOMATERIALS ,PHYSIOLOGIC strain ,WEIBULL distribution ,CRACK propagation (Fracture mechanics) - Abstract
Abstract: The objectives of this study were to identify the effect of design parameters, namely marginal thickness, degree of convergence and the different interfacial conditions, on the initial failure load that induces cracking from the margin in glass-simulated dental crowns. Crown-like glass cylinders were prepared to simulate posterior all-ceramic crowns with two different marginal thicknesses (0.8 or 1.2mm) and degrees of convergence (6° or 12°). A three-step bonding system was used complementarily with a silane coupling agent to adhesively bond the specimens to resin dies. The crowns were subjected to an axial applied load to generate hoop tensile stress at the crown margin. The entire loading and fracture processes were recorded by video camera. The loading data were compared with the other two interfacial treatments (Vaseline grease and directly poured uncured resin on glass). The Weibull distribution was used to statistically analyze the characteristic failure load and the mean values. The fracture surfaces were fractographically analyzed along with the load–displacement curves, and the degrees of crack stability for each parameter were also identified. It was found that there is no difference in the initial failure load between the different marginal thicknesses in all interfacial conditions. The bonded crowns present more resistance to crack propagation. The higher convergence crown preparation can reduce the initial failure load at the crowns’ margin, which can be resisted by a strongly bonded interface. Clear interactions between margin design parameters and their effects on the stress development and crack propagation are necessary to develop an appropriate design of all-ceramic crowns. [Copyright &y& Elsevier] more...
- Published
- 2012
- Full Text
- View/download PDF
35. Selective Liquefaction of Wheat Straw in Phenol and Its Fractionation.
- Author
-
Chen, Hongzhang, Zhang, Yuzhen, and Xie, Shuangping
- Abstract
For the first time, a method of phenol-selective liquefaction is proposed for the fractionation and multilevel conversion of lignocellulose. Through phenol-selective liquefaction, lignin and hemicellulose are liquefied, with large amounts of cellulose retained in the unliquefied residues. Using a phenol/straw ratio of 3 and a sulfuric acid concentration of 3 %, large amounts of hemicellulose (≥85 %) and lignin (≥70 %) can be liquefied at 100 °C in 30 min, with a high quantity of cellulose (≥80 %) retained. Unliquefied residues from selective liquefaction have higher susceptibility for enzymatic attack. Enzymatic hydrolyzation of residues can be as high as 65 % in 48 h with 40.7 FPU/g of dry materials, which can then be used to prepare sugar platform intermediates. The liquefied products of wheat straw are then resinified with formaldehyde in the presence of NaOH as a catalyst and synthesized into phenol formaldehyde-type resins reaching up to GB/T 14732-2006 standards. Phenol selective liquefaction, a new technology for the fractionation of lignocellulose, achieves effective fractionation and multilevel conversion of straw components. Hence, it is an important tool to achieve full utilization of biomass and high value-added conversion of lignocellulose. [ABSTRACT FROM AUTHOR] more...
- Published
- 2012
- Full Text
- View/download PDF
36. Effect of air abrasion and thermocycling on resin adaptation and shear bond strength to dentin for an etch-and-rinse and self-etch resin adhesive.
- Author
-
Freeman, Rebecca, Varanasi, Srinivas, Meyers, Ian A., and Symons, Anne L.
- Subjects
TOOTH abrasion ,THERMOCYCLING ,RESIN adhesives ,CONFOCAL microscopy ,DENTAL materials - Abstract
This study examined the effect of air abrasion and thermocycling on the adaptation and shear bond strength, of composite resin bonded to dentin using etch-and-rinse and self-etch resin adhesives. Confocal microscopy showed both adhesives closely adapted to dentin and a significantly (p<0.001) greater number of resin tags were observed for the etch-and-rinse adhesive. Air abrasion significantly increased resin tag length (p<0.05) for the etch-and-rinse adhesive and significantly increased the number (p<0.001), length (p<0.001) and thickness (p<0.01) of tags for the self-etch adhesive. However, air abrasion resulted in defect formation within the hybrid layer and thermocycling caused separation of the hybrid layer from adjacent dentin containing resin tags. A significant (p<0.05) reduction in shear bond strength was observed for the etch-and-rinse adhesive following thermocycling. Both adhesive systems adapted well to dentin in vitro and shear bond strengths were similar. The area of tag penetration into dentin was significantly (p<0.0001) enhanced following air abrasion. [ABSTRACT FROM AUTHOR] more...
- Published
- 2012
- Full Text
- View/download PDF
37. A review: Biodegradation of resin–dentin bonds.
- Author
-
Hashimoto, Masanori, Nagano, Futami, Endo, Kazuhiko, and Ohno, Hiroki
- Subjects
BIODEGRADATION ,GUMS & resins ,DENTIN ,POLYMERS ,TRANSMISSION electron microscopy ,HYDROLYSIS ,MONOMERS - Abstract
Summary: Resin–dentin bonding was first achieved through mechanical hybridization between resin and collagen fibrils using a functional monomer containing resin system. In the last decade, new adhesive resin systems were frequently released onto the market within a short-period of time. Before and after commercialization, the bond integrity has been tested by bond tests, and leakage evaluation by researchers, but it is very difficult for clinicians to obtain a comprehensive, up-to-date understanding of their nature and degradation. Although newly developed adhesive resins have attempted to improve the bond strength at least in the first 24h after bonding, the long-term durability of the bonds has not yet been established analytically. However, numerous recent studies have shown micromorphological evidence of biodegradation of resin–dentin bonds, due to hydrolysis of the resin and collagen fibrils within the bonds. This review mainly summarizes the most recent work in biodegradation of resin–dentin bonds based on micromorphological analyses of data obtained by scanning and transmission electron microscopy. [ABSTRACT FROM AUTHOR] more...
- Published
- 2011
- Full Text
- View/download PDF
38. Investigation of adhesives based on synthetic resins in works of All-Russia Institute of Aircraft Materials in 1940.
- Author
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Narsky, A. and Smolegovsky, A.
- Abstract
review is given of scientific research conducted by the All-Russia Institute of the Aircraft Materials for the period of 1940 devoted to the creation of new synthetic adhesives for the aircraft and the optimization of gluing technology using VIAM-B3 adhesive produced previously. The creation of KR4 adhesive with a minimal content of toxic substances in a free state and its use in the development of technology for gluing wooden workpieces, as well as for obtaining flexible VIAM-B3 adhesive, is described for the considered time period. [ABSTRACT FROM AUTHOR] more...
- Published
- 2011
- Full Text
- View/download PDF
39. Investigation of artificial resin-based adhesives in works carried out by the all-Russia Scientific Research Institute of Aviation Materials in 1936-1937.
- Author
-
Narskii, A. and Smolegovskii, A.
- Abstract
The main preconditions for developing principally new (for the examined period of time) adhesives based on artificial resins are presented. The results of application of the combined (casein and resin) adhesives, adhesives based on novolak, karbolit and barite phenol formaldehyde resins are given. It is shown that the phenol-barite resin of VIAM-6 grade was the most suitable for the aviation industry at that time. [ABSTRACT FROM AUTHOR] more...
- Published
- 2010
- Full Text
- View/download PDF
40. Polymerization contraction stress in dentin adhesives bonded to dentin and enamel
- Author
-
Hashimoto, Masanori, de Gee, Anton J., and Feilzer, Albert J.
- Subjects
- *
DENTIN , *DENTINOGENESIS , *DENTAL adhesives , *DENTAL materials - Abstract
Abstract: Objective: In a previous study on of polymerization contraction stress determinations of adhesives bonded to dentin a continuous decline of stress was observed after the adhesives had been light-cured. The decline was ascribed to stress relief caused by diffusion into the adhesive layer of water and/or solvents, left in the impregnated dentin surface after drying and/or evaporation in the application procedure. The purpose of the present study was to test the hypothesis that the contraction stress of adhesives bonded to enamel will not decline after light-curing, based on the assumption that water and/or solvents are more efficiently removed from impregnated enamel surfaces in the drying and/or evaporation step. Materials and methods: Contraction stress was determined in a tensilometer for three total-etching adhesives Scotchbond multi-purpose, Single bond and One-step plus and four self-etching adhesives Clearfil SE Bond, Clearfil Protect Bond, AdheSE, and Xeno III. The adhesives were placed in a thin layer between a glass plate and a flat dentin or enamel surface pre-treated with phosphoric acid or self-etching primer and light-cured under constrained conditions. Results: All adhesives bonded to enamel showed a stress decline, but significantly less than for dentin with the exception of two self-etching adhesives. The greatest decline was found for the total-etching adhesive systems bonded to dentin. The presence of hydrophobic monomers in the adhesives had a significant influence on the decline. Significance: The experiments indicate that fluids are withdrawn from the resin impregnated tooth structures, which may result in small defects in the tooth–resin interfaces. [Copyright &y& Elsevier] more...
- Published
- 2008
- Full Text
- View/download PDF
41. Effect of Urea-Formaldehyde Resin Adhesive Viscosity on Plywood Adhesion
- Author
-
Byung-Dae Park and Min-Kug Hong
- Subjects
Chemistry ,Materials Science (miscellaneous) ,Condensation ,Urea-formaldehyde ,Wheat flour ,030206 dentistry ,02 engineering and technology ,Adhesion ,021001 nanoscience & nanotechnology ,Industrial and Manufacturing Engineering ,03 medical and health sciences ,Viscosity ,chemistry.chemical_compound ,0302 clinical medicine ,Composite material ,0210 nano-technology ,Resin adhesive - Published
- 2017
- Full Text
- View/download PDF
42. Synthesis of melamine-glucose resin adhesive.
- Author
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Chen, Shuanhu and Zhang, Lei
- Abstract
The synthesis of a novel melamine-glucose adhesive that is similar to urea-formaldehyde adhesive is reported in this paper. The conditions of synthesis, such as the initial pH, the quantity of catalyst, the temperature of reaction, the percentage of each reactant and the time of reaction, were optimized by using the orthogonal experimental method. [ABSTRACT FROM AUTHOR] more...
- Published
- 2005
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43. FINITE ELEMENT ANALYSIS OF ANISOTROPIC CONDUCTIVE FILM FOR CHIP ON GLASS PROCESS.
- Author
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Cheng, YungNeng, Lee, Shyong, and Lee, Jye
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THIN films ,LIQUID crystal displays ,FINITE element method ,MANUFACTURING processes - Abstract
Anisotropically conductive film (ACF) is a smart electronic packaging material that consumes minimal space for connecting integrated circuit (IC) chips to a liquid crystal display (LCD) panel or printed circuit board. It consists of an adhesive resin and fine conductive fillers such as metallic particles or metal-coated polymer balls. The fillers are compressed and maintain a certain elastic capability while conducted between electrodes. The size of the contact area and the shape of the fillers are important factors in determining conductivity. The process of applying ACF is modeled into three consecutive steps, and the stress and deformation states are studied by finite element analysis in each. In step 1 of the manufacturing process, external load is applied to compress the conductive particles at a temperature of 190°C so that the matrix resin is in a fluid condition. In step 2, an external load is maintained at this temperature to allow the matrix resin to solidify; then, the load is released and the particles spring back to create tensile stresses in the bonding resin matrix. The last step considers the bonded and conducting ACF cooling from 190°C to room temperature. The state of stress and deformation will be readjusted due to different contraction properties between the filler and matrix resin. The results presented in this paper show that changing the thickness of a coated nickel layer does not clearly affect the conductivity of ACF, and the deformation should be greater than 40% for the stability of conductivity. [ABSTRACT FROM AUTHOR] more...
- Published
- 2002
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44. A Comparative Clinical Trial of a Compomer and a Resin Adhesive for Orthodontic Bonding.
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Millett, D. T., McCluskey, L.-A., McAuley, F., Creanor, S. L., Newell, J., and Love, J.
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COMPARATIVE studies ,DENTAL adhesives ,DENTAL resins ,DENTAL bonding ,TREATMENT of malocclusion ,ORTHODONTICS - Abstract
The study aimed to compare the survival time and cariostatic potential of a compomer to that of a resin adhesive when used to bond stainless steel orthodontic brackets to labial segment teeth only. The effect of the patients' sex, age at the start of treatment and presenting malocclusion on bracket survival time was assessed also. Forty-five consecutive patients who attended for fixed appliance therapy were randomly selected. Four hundred twenty-six brackets were bonded (213 with compomer and 213 with resin adhesive) with a split mouth design; the right or left side allocation of compomer in either arch was alternated. Color transparencies of the maxillary incisors, mandibular incisors, or both, and transparencies of the canines, were taken before treatment. At the debond stage, the transparencies were projected (20x) and assessed by an experienced examiner, who used a caries index. The survival time distributions for brackets bonded with each bonding agent were not significantly different (P = .74, paired Prentice-Wilcoxon test; P = .75, Akritas test), with bracket failure rates of 17% and 20% recorded for compomer and resin adhesive, respectively. Neither the patients' sex (P = .85) nor malocclusion (P = .26) appear to affect significantly bracket survival, but patient age was identified as a useful prognostic indicator of bracket survival (P < .001). On average, there was more decalcification related to brackets bonded with resin adhesive than with compomer (P = .0075). Survival time distributions of brackets bonded with compomer or resin adhesive appear comparable, but decalcification was reduced significantly by bonding with compomer. [ABSTRACT FROM AUTHOR] more...
- Published
- 2000
45. Shear Bonding Strength and Thermal Cycling Effect of Fluoride Releasable/Rechargeable Orthodontic Adhesive Resins Containing LiAl-F Layered Double Hydroxide (LDH) Filler
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Jun-Yen Uan, Jian-Hong Yu, Chih-Ying Hung, Yin-Chia Chen, Liang-Wei Su, and Dan-Jae Lin
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Materials science ,orthodontic adhesive resin ,02 engineering and technology ,Temperature cycling ,lcsh:Technology ,Article ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Fluoride release ,thermal cycling ,Adhesive remnant index ,lithium aluminum (fluoride) layered double hydroxide ,General Materials Science ,Composite material ,lcsh:Microscopy ,Resin adhesive ,lcsh:QC120-168.85 ,shear bond strength test ,lcsh:QH201-278.5 ,lcsh:T ,030206 dentistry ,021001 nanoscience & nanotechnology ,chemistry ,Bonding strength ,lcsh:TA1-2040 ,Hydroxide ,cytotoxicity ,lcsh:Descriptive and experimental mechanics ,Adhesive ,fluoride release ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,0210 nano-technology ,lcsh:Engineering (General). Civil engineering (General) ,Fluoride ,lcsh:TK1-9971 - Abstract
This study aims to investigate the shear bonding strength (SBS) and thermal cycling effect of orthodontic brackets bonded with fluoride release/rechargeable LiAl-F layered double hydroxide (LDH-F) contained dental orthodontic resin. 3% and 5% of LDH-F nanopowder were gently mixed to commercial resin-based adhesives Orthomite LC (LC, LC3, LC5) and Transbond XT (XT, XT3). A fluoroaluminosilicate modified resin adhesive Transbond color change (TC) was selected as a positive control. Fifteen brackets each group were bonded to bovine enamel and the SBS was tested with/without thermal cycling. The adhesive remnant index (ARI) was evaluated at 20×, magnification. The fluoride-releasing/rechargeability and cytocompatibility were also evaluated. The SBS of LC, LC3, and LC5 were significantly higher than XT and TC. After thermal cycling, the SBS of LC, LC3, and LC5 did not decrease and was significantly higher than TC. The changes of ARI scores indicate that failure occurred not only cohesive but also semi-cohesive fracture. The 30 days accumulated daily fluoride release of LC3, LC5, and TC without recharge are higher than 300 &mu, g/cm2. The LDH-F contained resin adhesive possesses higher SBS compared to positive control TC. Fluoride release and the rechargeable feature can be achieved for preventing enamel demineralization without cytotoxicity. more...
- Published
- 2019
46. Research status, industrial application demand and prospects of phenolic resin
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Hao Ren, Yanru Xu, Huamin Zhai, Haonan Zhang, and Lifang Guo
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General Chemical Engineering ,technology, industry, and agriculture ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Pulp and paper industry ,01 natural sciences ,0104 chemical sciences ,Environmental resistance ,stomatognathic system ,Wood processing ,Bonding strength ,Business ,Adhesive ,0210 nano-technology ,Resin adhesive - Abstract
The synthesis process of the phenolic resin adhesive was developed in the 19th century, and its excellent environmental resistance and high bonding strength make it one of the main wood adhesives. With the development of industry, phenolic resin adhesive is not only used in plywood, wood processing and laminate, but also in automobile, aerospace, composite materials and other fields. Herein we review the main synthetic processes and latest research progress for phenolic resin adhesives, the capacity distribution of major domestic phenolic resin enterprises, analysis of domestic phenolic resin consumption, import and export volume and price, Chinese plywood production, and the main production and export markets. Furthermore, research and discussion on the commercial application of domestic phenolic resin adhesives in plywood were carried out, which provides a reference for development of better phenolic resin adhesives that meet the development needs of the country, along with quality and economic competitiveness. more...
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- 2019
47. Bonding resin thixotropy and viscosity influence on dentine bond strength
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Alexander Schmidt, Thomas Niem, and Bernd Wöstmann
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Thixotropy ,Materials science ,02 engineering and technology ,Composite Resins ,03 medical and health sciences ,Viscosity ,0302 clinical medicine ,stomatognathic system ,Tensile Strength ,Materials Testing ,Composite material ,Resin tags ,General Dentistry ,Resin adhesive ,Bond strength ,technology, industry, and agriculture ,030206 dentistry ,Penetration (firestop) ,021001 nanoscience & nanotechnology ,Resin Cements ,Distilled water ,Dentin-Bonding Agents ,Dentin ,Adhesive ,Shear Strength ,0210 nano-technology - Abstract
Objectives To investigate the influence of bonding resin thixotropy and viscosity on dentine tubule penetration, blister formation and consequently on dentine bond strength as a function of air-blowing pressure (air-bp) intensity. Methods Two HEMA-free, acetone-based, one-bottle self-etch adhesives with similar composition except disparate silica filler contents and different bonding resin viscosities were investigated. The high-filler-containing adhesive (G-Bond) featured a lower viscous bonding resin with inherent thixotropic resin (TR) properties compared to the low-filler-containing adhesive (iBond) exhibiting a higher viscous bonding resin with non-thixotropic resin (NTR) properties. Shear bond strength tests for each adhesive with low (1.5 bar; 0.15 MPa; n = 16) and high (3.0 bar; 0.30 MPa; n = 16) air-bp application were performed after specimen storage in distilled water (24 h; 37.0 ± 1.0 °C). Results were analysed using a Student’s t -test to identify statistically significant differences ( p Results Statistically significant bond strength differences were obtained for the thixotropic resin adhesive (high-pressure: 24.6 MPa, low-pressure: 9.6 MPa). While high air-bp specimens provided SEM images revealing resin-plugged dentine tubules, resin tags and only marginally blister structures, low air-bp left copious droplets and open dentine tubules. In contrast, the non-thixotropic resin adhesive showed no significant bond strength differences (high-pressure: 9.3 MPa, low-pressure: 7.6 MPa). Conclusions A pressure-dependent distinct influence of bonding resin thixotropy and viscosity on dentine bond strength has been demonstrated. Stronger adhesion with high air-bp application is explained by improved resin fluidity and facilitated resin penetration into dentine tubules. Clinical significance Filler particles used in adhesive systems may induce thixotropic effects in bonding resin layers, accounting for improved free-flowing resin properties. In combination with high air-bp this effect allows an easy plugging of dentine tubules and elimination of blister structures, both resulting in superior dentine bond strength. more...
- Published
- 2016
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48. Decalcification in relation to brackets bonded with glass ionomer cement or a resin adhesive.
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Millett, D. T., Nunn, J. H., Welbury, R. R., and Gordon, P. H.
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ORTHODONTIC appliances ,DENTAL glass ionomer cements ,CALCIFICATION ,DENTAL bonding ,DENTAL adhesives ,FLUORIDES - Abstract
Forty randomly selected patients had brackets bonded on one side of the of the maxillary labial segment with glass ionomer cement. Teeth on the opposite side were bonded with a resin adhesive. Teeth were assessed for decalcification pretreatment, at debond, and at review using a standardized photographic technique and a modified DDE index. The mean number of teeth affected by decalcification and the mean extent of decalcification per tooth increased during the treatment period, but from debond to review both of these measurements decreased for teeth bonded with either material (p<0.01, t-test). Decalcification appears to become less severe posttreatment, but does not appear to be significantly affected during 12 to 18 months of orthodontic treatment by bonding with glass ionomer cement. Dietary and other environmental factors, including fluoride preparations, may be of greater importance in the prevention of decalcification during fixed appliance therapy. [ABSTRACT FROM AUTHOR] more...
- Published
- 1999
49. Long-Term Formaldehyde Emission Potential from UF- and NAF-Bonded Particleboards
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Timothy L. Chaffee, Charles R. Frihart, and James M. Wescott
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urea formaldehyde ,Materials science ,Polymers and Plastics ,formaldehyde emissions ,Formaldehyde ,010501 environmental sciences ,01 natural sciences ,Article ,lcsh:QD241-441 ,soy ,chemistry.chemical_compound ,lcsh:Organic chemistry ,no-added formaldehyde ,Relative humidity ,Resin adhesive ,UF ,0105 earth and related environmental sciences ,040101 forestry ,Urea-formaldehyde ,humidity ,Humidity ,04 agricultural and veterinary sciences ,General Chemistry ,Pulp and paper industry ,NAF ,chemistry ,0401 agriculture, forestry, and fisheries ,Adhesive ,heat - Abstract
As a result of the dominance of urea formaldehyde (UF)-bonded particleboard, it seemed worthwhile to examine formaldehyde emissions years after production. A California Air Resources Board (CARB) phase II-compliant commercial particleboard produced with a UF resin adhesive was compared to a no-added formaldehyde (NAF)-particleboard produced with Soyad&trade, adhesive resin for formaldehyde emissions during exposure to elevated humidity and temperature conditions after being in a room at 21 ±, 1.9 °, C, 50 ±, 3.3% relative humidity for 3.5 years. A modified version of EN 717-3 was used to collect formaldehyde emissions under typical along with higher temperature and humidity conditions. The formaldehyde emissions from the commercial particleboard panel bonded with a UF adhesive even after the 3.5 years of exposure greatly increased only during exposure of the panels to elevated heat and humidity compared to typical testing conditions. The amounts were the same as those with the previous shorter-term study. In contrast, formaldehyde emissions from the NAF-bonded particleboard were not as susceptible (in absolute terms) to increases in temperature and relative humidity conditions. more...
- Published
- 2020
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50. Hafting of Middle Paleolithic tools in Latium (central Italy): New data from Fossellone and Sant’Agostino caves
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Zenobia Jacobs, Paola Villa, Katerina Douka, Carlo Tozzi, Sylvain Soriano, Jeannette J. Lucejko, Luca Pollarolo, Silvana Vitagliano, Ilaria Degano, University of Pisa - Università di Pisa, Archéologies et Sciences de l'Antiquité (ArScAn), Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), University of Colorado Museum, University of Colorado [Boulder], Université de Genève (UNIGE), University of Wollongong [Australia], University of Oxford [Oxford], Istituto Italiano di Paleontologia Umana (Is.I.P.U.), Università di Pisa, Dipartimento di Scienze archeologiche, Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Institut national de recherches archéologiques préventives (Inrap)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS), Anthropologie des techniques, des espaces et des territoires au Pliocène et au Pléistocène (AnTET), Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Institut national de recherches archéologiques préventives (Inrap)-Centre National de la Recherche Scientifique (CNRS)-Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Ministère de la Culture et de la Communication (MCC)-Institut national de recherches archéologiques préventives (Inrap)-Centre National de la Recherche Scientifique (CNRS), Université de Genève = University of Geneva (UNIGE), and University of Oxford more...
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Technology ,Social Sciences ,Stone Age ,01 natural sciences ,law.invention ,[SHS]Humanities and Social Sciences ,ddc:590 ,law ,Middle Paleolithic ,Paleolithic Period ,0601 history and archaeology ,Radiocarbon dating ,Materials ,History, Ancient ,Resin adhesive ,ComputingMilieux_MISCELLANEOUS ,Palaeolithic ,Neanderthals ,Sedimentary Geology ,Minerals ,Multidisciplinary ,geography.geographical_feature_category ,060102 archaeology ,Physics ,Geology ,Hominidae ,06 humanities and the arts ,Mineralogy ,Limestone ,Radioactive Carbon Dating ,Italy ,Archaeology ,Physical Sciences ,Medicine ,Physical Anthropology ,Research Article ,010506 paleontology ,[SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory ,Prehistory ,Science ,Materials Science ,Biophysics ,Research and Analysis Methods ,Hafting ,Fires ,Lithic analysis ,Cave ,Paleoanthropology ,Dosimetry ,Adhesives ,Animals ,Chemical Characterization ,Petrology ,Isotope Analysis ,0105 earth and related environmental sciences ,Lithic industry ,geography ,Tool Use Behavior ,Biology and Life Sciences ,Paleontology ,Correction ,Geologic Time ,Anthropology ,Archaeological Dating ,Earth Sciences ,Sediment ,Resins, Plant - Abstract
Hafting of stone tools was an important advance in the technology of the Paleolithic. Evidence of hafting in the Middle Paleolithic is growing and is not limited to points hafted on spears for thrusting or throwing. This article describes the identification of adhesive used for hafting on a variety of stone tools from two Middle Paleolithic caves in Latium, Fossellone Cave and Sant'Agostino Cave. Analysis of the organic residue by gas chromatography/mass spectrometry shows that a conifer resin adhesive was used, in one case mixed with beeswax. Contrary to previous suggestions that the small Middle Paleolithic tools of Latium could be used by hand and that hafting was not needed since it did not improve their functionality, our evidence shows that hafting was used by Neandertals in central Italy. Ethnographic evidence indicates that resin, which dries when exposed to air, is generally warmed by exposure to a small fire thus softened to be molded and pushed in position in the haft. The use of resin at both sites suggests regular fire use, as confirmed by moderate frequencies of burnt lithics in both assemblages. Lithic analysis shows that hafting was applied to a variety of artifacts, irrespective of type, size and technology. Prior to our study evidence of hafting in the Middle Paleolithic of Italy was limited to one case only. more...
- Published
- 2019
- Full Text
- View/download PDF
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