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Statement of the problem: posterior quadrants of the oral cavity are subjected to high occlusal loads. Performance of occlusal veneers is affected by fabrication material and veneer thickness.Objective: This study was conducted to assess the effect of veneer material and thickness on fracture resistance of CAD/CAM occlusal veneers. Materials and Methods: Sixty human premolars were prepared for occlusal veneers manufactured from three CAD/CAM materials; IPS E-max (E.max), Vita Enamic (VE) and Lava Ultimate (LU). Veneers were manufactured in 1 mm and 0.5mm thicknesses. (n=10). After cementation, specimens were subjected to Fracture resistance test and failure mode analysis. Results: Two-way ANOVA showed that both material and thickness had significant effect on the fracture resistance. Significant differences were present between the two thicknesses for VE and LU. For IPS E-max, no significant difference was present between the two thicknesses.Conclusion: E.max showed the highest fracture resistance in both thicknesses followed by LU and the lowest was recorded with VE. Results of 1mm Veneers were significantly higher than 0.5 mm.
Soliman et al. (Mon,) studied this question.