Marginal Fit of Veneers Made From Different Lithium Disilicate CAD/CAM Materials

: Objective: To assess the degree of marginal adaptation of CAD/CAM milled veneers from three different lithium disilicate materials: Upcera Lithium Disilicate CAD, Rosetta SM Lithium Disilicate CAD, and Ivoclar IPS e.max CAD, with a marginal thickness of 0.3mm. Materials and Methods: Twenty-four laminate veneers were milled from lithium disilicate blocks (IPS e.max, Upcera, and Rosetta SM) with a marginal thickness of 0.3mm using a CAD/CAM milling machine (Sirona Cerec MCXL), each group of materials consists of 8 veneers and were cemented to duplicated epoxy dies then a digital microscope was used to assess the marginal adaptation. Results: For cervical surfaces, IPS e.max showed a significantly higher value than other materials (p<0.001). For proximal (1), Upcera material showed a significantly higher value than other materials (p<0.001). For all other surfaces and the total averages for each sample, the difference was not statistically significant between the three materials (p>0.05). Conclusions: Within the limitations of this in vitro study, the following conclusion was drawn: The overall marginal gap values of laminates fabricated from IPS e.max, Upcera, and Rosetta SM lithium disilicate CAD blocks are comparable to each other and are considered to be clinically acceptable.