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 MSA  Vol.9 No.4 , April 2018
Artificial Enamel Wear after Prolonged Chewing Simulation against Monolithic Y-TZP Crowns
Abstract: The aim of this study was to evaluate the effect of chewing simulation on wear of artificial enamel abraded against zirconia-based crowns. Fifteen crown preparations were scanned for the manufacturing of crowns using computer-aided-design/computer-aided-machining technique (CAD/CAM), according to the following (n = 5): Polished (PM) and glazed (GM) monolithic zirconia (1.5 mm uniform thickness), and Bilayer (BL - 0.8 mm zirconia coping, 0.7 mm porcelain veneer) crowns. The samples were cemented and chewing simulation (2.5 million cycles/0-80N/artificial saliva/37°C) was performed with steatite indenters (6 mm diameter) as antagonists. Assuming the uniformity of the unaged samples, antagonists were scanned using a surface profilometer and the material loss volume was calculated. Roughness of the crowns’ occlusal surface was also analyzed using the profilometer. Scanning electron microscopy was used to characterize the abraded surface. One-way ANOVA and Tukey test (p = 0.05) were employed for analysis of wear results. A significant difference was observed among the groups (p < 0.001). Artificial enamel abraded against porcelain (BL) had significantly higher material loss (0.217 mm3 ± 0.015) than those abraded against monolithic zirconia, polished (PM - 0.167 mm3 ± 0.02) and glazed (0.101 mm3 ± 0.03), which were similar to each other. Veneering porcelain results in more pronounced wear of the artificial enamel than monolithic zirconia. However, mastication against monolithic Y-TZP also imposes wear to the opposing teeth.
Cite this paper: Vedana, D. , Vedana, L. , Martins, E. , Brodersen, P. and De Souza, G. (2018) Artificial Enamel Wear after Prolonged Chewing Simulation against Monolithic Y-TZP Crowns. Materials Sciences and Applications, 9, 381-392. doi: 10.4236/msa.2018.94026.
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