Marginal Accuracy and Fracture Resistance of Occlusal Veneers Constructed from Different Pressable Ceramics

Authors

1 B.D.S (2015) Al-Zawia University, Libya

2 Professor of Crowns and Bridges, Faculty of Dental Medicine for Girls, Al Azhar University, Cairo, Egypt.

3 Lecturer of Fixed Prosthodontics, Faculty of Dentistry, Pharos University in Alexandria, Egypt

Abstract

Purpose: to assess the marginal accuracy and fracture resistance of occlusal veneers constructed from four different pressable ceramics. Materials & methods: typodont lower second molar tooth was chosen and prepared using CNC. The tooth was duplicated to produce 40 epoxy-resin dies and divided into four groups according to pressable ceramic, Group1: LiSi, Group2: Celtra, Group3: Ambria, Group4:e.max. Marginal accuracy of each sample was evaluated by measuring the marginal gap using a digital microscope, all veneers bonding to their corresponding epoxy-resin dies, and exposure to the ROBOTA chewing simulator. After that, the marginal accuracy was evaluated again after cementation and thermo-mechanical aging. The fracture resistance was measured by universal testing machine. Data was performed using ANOVA then Tukey’s Post Hoc test(PResults: the four ceramic materials showed an acceptable marginal accuracy value. Regardless of measurement stage, the highest marginal gap was recorded by LiSi then e.max and Ambria groups the lowest marginal gap was recorded by Celtra group. There were statistically significant differences among groups. Regarding fracture resistance, it was found that the highest value was recorded with e.max then Celtra and Ambria groups, the lowest value was recorded by LiSi group and this difference was statistically significant. Conclusions: Different pressable ceramics used for the construction of occlusal veneer significantly affect their marginal accuracy. However, the occlusal veneers constructed from e.max, LiSi, AMBRIA, and Celtra provides clinically acceptable marginal discrepancy but the marginal discrepancy after thermo-mechanical fatigue recorded a statistically increased significantly. Different pressable ceramic materials have effect on the fracture resistance of occlusal veneers.

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