Reliability of nonretentive all-ceramic CAD/CAM overlays

Intracoronal restorations have a variable risk of cusp fracture depending on the amount of tooth structure remaining. All-ceramic restorations with acusp-supporting design could be a long-lasting alternative. The aim of this study was to verify the clinical reliability of occlusal veneers. A total of 286 occlusal veneers made of Vita Mark II ceramic that were fabricated and inserted in 244 patients from 2003 to 2004 using the Cerec method with an optimized ceramic design were periodically re-assessed over the following years. Based on the fracture rate observed over 93 months of follow-up, the probability of survival was 99.3%, demonstrating the excellent practical suitability of the method. In light of this, it is worth reconsidering the question of treatment with intracoronal restorations versus occlusal veneers in the posterior region.