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    Evaluation of Fracture Strength of Different CAD/CAM Veneers That are Manufactured for Zirconia Cores
    (Selçuk Üniversitesi, 2022 Aralık) Akat, Bora; Çakırbay Tanış, Merve; Kılıçarslan, Mehmet Ali
    Background: The purpose of this study was to evaluate the fracture resistance of zirconia crowns veneered with CAD/CAM fabricated veneers by using simple and anatomic core designs with different veneering materials and procedures.. Methods: A total of 100 zirconia frameworks were fabricated with an anatomic core design or simple core design. The frameworks were then divided into five subgroups according to the following veneering procedures: Control (layering), cemented CAD/CAM fabricated feldspathic veneer, cemented CAD/CAM fabricated lithium disilicate veneer, fused CAD/CAM fabricated feldspathic veneer, and fused CAD/CAM fabricated lithium disilicate veneer. Next, 250000 cycles were applied with an occlusal load of 50 N at 1.6 Hz in a chewing simulator, and a thermal cycle was applied during loading (5°C to 50°C every 60 s). The crowns were then subjected to a single load failure test by using a universal test machine. Results: Statistical analyses between the groups showed significant differences (F= 23.296; p<0,001). The lowest fracture resistance values were observed in fused feldspathic CAD/CAM veneers with an anatomic core design (470.63 N). The highest fracture resistance was obtained in cemented lithium disilicate CAD/CAM veneers with a simple core design (2075.06 N). Conclusion: Within the limitations of this study, it can be said that the use of CAD/CAM fabricated veneers can be an alternative to layering when their advantages are considered.