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234 results on '"Silikas, Nikolaos"'

20. In Vitro Evaluation of Marginal and Internal Adaptations of Ceramic Inlay Restorations Associated with Immediate vs Delayed Dentin Sealing Techniques.

Author

Ashy, Linah M., Marghalani, Hanadi, and Silikas, Nikolaos

Subjects
IN vitro studies, PHYSIOLOGICAL adaptation, INLAYS (Dentistry), IMMEDIATE dentures, DENTAL ceramics, DENTAL bonding, DENTIN, MOLARS
Abstract

Purpose: To investigate the marginal and internal adaptations of ceramic inlay restorations placed with immediate dentin sealing (IDS) vs delayed dentin sealing (DDS) procedures.Materials and Methods: Mesial and distal Class II cavities were prepared in 12 extracted molar teeth, which were randomly allocated into six groups of 2 teeth each. Lava Ultimate inlays were fabricated and luted to the cavities using All-Bond universal adhesive system and eCEMENT dual-curing resin cement following IDS/immediate cementation (control groups 1 and 2), IDS/delayed cementation (groups 3 and 4), or DDS/delayed cementation (groups 5 and 6) protocols. Teeth in groups 2, 4, and 6 were subjected to thermocycling of 500 cycles between 5°C and 55°C after inlay cementation. Following staining with silver nitrate solution, the marginal and internal gap volumes were determined using microcomputed tomography images. Statistical analyses were conducted using independent t test and one-way analysis of variance followed by Tukey post hoc test (P < .05).Results: Marginal gap volume for DDS (1.856 ± 0.323 mm3) was significantly higher than that of IDS immediately after inlay cementation (0.891 ± 0.281 mm3) (P = .025). Following thermocycling, the internal gap volume for DDS (0.838 ± 0.248 mm3) was significantly higher than that for IDS (0.098 ± 0.066 mm3) (P = .000), but the marginal gap volume of DDS (1.964 ± 0.956 mm3) was not significantly different from that of IDS (1.426 ± 0.725 mm3) (P = .622).Conclusion: Luted ceramic inlays have a superior marginal adaptation right after cementation and a superior internal adaptation after thermocycling when using the IDS technique compared to the DDS technique. However, marginal adaptation after thermocycling was not significantly different between the two techniques. [ABSTRACT FROM AUTHOR]

Published
2020
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29. Assessing Tensile Bond Strength Between Denture Teeth and Nano-Zirconia Impregnated PMMA Denture Base

Author

Zidan, Saleh, Silikas, Nikolaos, Haider, Julfikar, Alhotan, Abdulaziz, Jahantigh, Javad, and Yates, Julian

Subjects
Dental Stress Analysis, zirconia, ZrO2, Denture Bases, denture, Acrylic Resins, Biophysics, Metal Nanoparticles, Pharmaceutical Science, Zirconia, ZrO, Bioengineering, Biomaterials, International Journal of Nanomedicine, Tensile Strength, Materials Testing, Drug Discovery, tensile bond strength, TBS, Polymethyl Methacrylate, Original Research, Nanocomposite, Tensile bond strength, nanocomposite, Organic Chemistry, Dental Bonding, Failure mode, PMMA, Denture, Zirconium, failure mode
Abstract

Saleh Zidan,1,2 Nikolaos Silikas,1 Julfikar Haider,3 Abdulaziz Alhotan,1 Javad Jahantigh,1 Julian Yates1 1Dentistry, School of Medical Sciences, University of Manchester, Manchester M13 9PL, UK; 2Department of Dental Materials, Faculty of Dentistry, Sebha University, Sebha, Libya; 3Department of Engineering, Manchester Metropolitan University, Manchester M1 5GD, UKCorrespondence: Saleh ZidanDentistry, School of Medical Sciences, University of Manchester, Coupland Building 3, Oxford Road, Manchester M13 9PL, UKTel +44-7933096536Email saleh_0072002@yahoo.co.ukPurpose: This study evaluated tensile bond strength (TBS) between anterior acrylic teeth and denture bases made of high-impact heat-cured acrylic resin (HI PMMA) impregnated with zirconia nanoparticles.Materials and Methods: A total of 30 specimens (each specimen containing a set of six upper anterior teeth) were fabricated from HI PMMA denture base acrylic resin reinforced with different weight concentrations of zirconia nanoparticles: 0% (control), 1.5%, 3%, 5%, 7% and 10%. TBS was tested according to a British standard (BS EN ISO 22112: 2017). A one-way analysis of variance (ANOVA) was employed with a Tukey post-hoc test.Results: TBS values between the anterior teeth (central and lateral incisors and canine) and HI-PMMA denture base groups containing 7 wt.% (261.5 ± 66.0 N, 172.5 ± 57.4 N and 271.9 ± 86.3 N) and 10 wt.% (332.1 ± 122.9 N, 165.4 ± 48.7 N and 301.6 ± 73.2 N) zirconia were significantly lower compared to the control group (645.4 ± 84.8 N, 306.1 ± 81.6 N and 496.7 ± 179.1 N) and the other nanocomposite groups. However, TBS values for HI PMMA with 1.5 wt.% (534.4 ± 115.3 N, 304.7 ± 86.4 N, 514.0 ± 143.2 N), 3 wt.% (685.7 ± 159.6 N, 281.1 ± 78.3 N, 462.6 ± 122.1 N) and 5 wt.% (514.5 ± 134.3 N, 229.8 ± 67.3 N, 387.2 ± 99.4 N) zirconia showed slightly lower values than that of the control group but these were not significant. Failure modes between the teeth and denture base nanocomposites were predominantly cohesive fractures, which were clinically acceptable according to the Standard.Conclusion: The addition of zirconia nanoparticles to HI PMMA denture base at high concentration (7 wt.% and 10 wt. %) significantly (p< 0.05) reduced the bonding strength for all types of anterior teeth compared to the control group.Keywords: denture, PMMA, zirconia; ZrO2, nanocomposite, tensile bond strength; TBS, failure mode

Published
2020

49. Improved mechanical performance of self-adhesive resin cement filled with hybrid nanofibers-embedded with niobium pentoxide

Author

Velo, Marilia M.A.C., primary, Nascimento, Tatiana R.L., additional, Scotti, Cassiana K., additional, Bombonatti, Juliana F.S., additional, Furuse, Adilson Y., additional, Silva, Vinícius D., additional, Simões, Thiago A., additional, Medeiros, Eliton S., additional, Blaker, Jonny J., additional, Silikas, Nikolaos, additional, and Mondelli, Rafael F.L., additional

Published
2019
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