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3. An evaluation of handling and physico-mechanical properties of resin-composite materials

Author

Al-Ahdal, Khold Yahya and Silikas, Nikolaos

Subjects
617.6, Resin composites, Speedmixer, Consistency, Stickiness, Rheology, Handling behaviour, Viscosity, Bulk-fill, Degree of conversion, Polymerization kinetics, Depth of cure, Mechanical properties, Visco-elasticity, Creep
Abstract

Resin composites are the most commonly used material in restorative dentistry. They have been used initially for aesthetical reasons, but afterwards were modified to be used widely for their good aesthetic and mechanical properties performance. They are classified as visco-elastic materials which are composed of inorganic fillers and organic matrix. The aim of this study was to investigate some handling properties of uncured resin composites such as stickiness, consistency and rheology. Also, to measure the degree of conversion and creep behaviour under static loading of some resin composites. In the pre-cure stage, their handling properties are very essential to achieve a successful dental restoration. Therefore, dental practitioners are very critical in choosing the resin composite restorative material. A texture analyser was used to measure the stickiness and consistency of some commercial resin composites. Also, the rheology of different commercial and model resin composites were investigated using the Bohlin Rheometer in two different temperatures (room and body temperature).Moreover, Fourier transform infrared spectroscopy (FTIR) was used to determine the degree of conversion of several bulk-fill resin composites (DC) at 4 mm depth at different periods during 24 h post-irradiation. Also, the visco-elastic stability of cured resin composites with different resin matrices was investigated under static load at different maturation times (1 h and 24 h).

Published
2015

5. The Effect of Dentifrice on Micro-Hardness, Surface Gloss, and Micro-Roughness of Nano Filled Conventional and Bulk-Fill Polymer Composite—A Micro Indentation and Profilometric Study

Author

Binhasan, Mashael, primary, Solimanie, Abdulilah H., additional, Almuammar, Khalid S., additional, Alnajres, Ahmed R., additional, Alhamdan, Mai M., additional, Al Ahdal, Khold, additional, Alfaawaz, Yasser F., additional, Ali, Khalid, additional, Vohra, Fahim, additional, and Abduljabbar, Tariq, additional

Published
2022
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6. Assessment of Golden Proportion among Natural Maxillary Anterior Teeth of Global Population: A Systematic Review

Author

Ahmed, Naseer, primary, Abbasi, Maria S., additional, Vohra, Fahim, additional, Khalid, Shiza, additional, Halim, Mohamad Syahrizal, additional, Ab-Ghani, Zuryati, additional, Alrabiah, Mohammed, additional, Al Ahdal, Khold, additional, Alhamdan, Mai M., additional, AlFaraz, Yassen, additional, Al-Aali, Khulud A., additional, and Abduljabbar, Tariq, additional

Published
2022
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10. Influence of milling systems and marginal configurations on the fit of yttrium stabilized tetragonal zirconia polycrystals (Y-TZP)’ copings

Author

Al-Aali, Khulud A, primary, Bin-Shuwaish, Mohammed S., additional, Alhenaki, Aasem M, additional, Al Ahdal, Khold, additional, Al Deeb, Laila, additional, Maawadh, Ahmed M, additional, AlHelal, Abdulaziz, additional, Alshehri, Hiba, additional, Vohra, Fahim, additional, and Abduljabbar, Tariq, additional

Published
2020
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14. Adhesive Bond Integrity of Experimental Zinc Oxide Nanoparticles Incorporated Dentin Adhesive: An SEM, EDX, μ TBS, and Rheometric Analysis.

Author

Alfaawaz YF, Alamri R, Almohsen F, Shabab S, Alhamdan MM, Al Ahdal K, Farooq I, Vohra F, and Abduljabbar T

Subjects
Adhesives analysis, Composite Resins chemistry, Dental Cements, Dentin, Dentin-Bonding Agents, Materials Testing, Microscopy, Electron, Scanning, Resin Cements analysis, Resin Cements chemistry, Tensile Strength, Dental Bonding, Zinc Oxide analysis, Zinc Oxide chemistry
Abstract

Objective: Our study is aimed at preparing an experimental adhesive (EA) and assessing the influence of adding 5-10 wt.% concentrations of zinc oxide (ZnO) nanoparticles on the adhesive's mechanical properties., Methods: Field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX) spectroscopy were employed to investigate the morphology and elemental distribution of the filler nanoparticles. To examine the adhesive properties, microtensile bond strength ( μ TBS) testing, an investigation of the rheological properties, degree of conversion (DC), and analysis of the interface between the adhesive and dentin were carried out., Results: The SEM micrographs of ZnO nanoparticles demonstrated spherical agglomerates. The EDX plotting confirmed the incidence of Zn and oxygen (O) in the ZnO nanoparticles. The highest μ TBS was observed for nonthermocycled (NTC) 5 wt.% ZnO group (32.11 ± 3.60 MPa), followed by the NTC-10 wt.% ZnO group (30.04 ± 3.24 MPa). Most of the failures observed were adhesive in nature. A gradual reduction in the viscosity was observed at higher angular frequencies, and the addition of 5 and 10 wt.% ZnO to the composition of the EA lowered its viscosity. The 5 wt.% ZnO group demonstrated suitable dentin interaction by showing the formation of resin tags, while for the 10 wt.% ZnO group, compromised resin tag formation was detected. DC was significantly higher in the 0% ZnO (EA) group., Conclusion: The reinforcement of the EA with 5 and 10 wt.% concentrations of ZnO nanoparticles produced an improvement in the adhesive's μ TBS. However, a reduced viscosity was observed for both nanoparticle-reinforced adhesives, and a negotiated dentin interaction was seen for 10 wt.% ZnO adhesive group. Further research exploring the influence of more filler concentrations on diverse adhesive properties is recommended., Competing Interests: The authors declare that they have no conflicts of interest., (Copyright © 2022 Yasser F. Alfaawaz et al.)

Published
2022
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