Numerical investigation of failure risk of cad/cam ceramic restoration for an endodontically treated maxillary premolar with mo preparation

摘要

This study evaluates the risk of failure for an endodontically treated premolar with mesio-occlosal (MO) preparation and four different computer-aided design/manufacturing (CAD/CAM) ceramic restoration configurations. Four three-dimensional finite element (FE) models designed with CAD/CAM ceramic inlay, endoinlay, endocrown, and classical crown restorations were constructed to perform simulations. The Weibull function was incorporated with an FE analysis to calculate the long-term failure probability relative to different load conditions. The results indicated that the stress values on the enamel, dentin, and luting cement for endocrown restoration were the lowest values relative to the other three restorations. According to the Weibull analysis, overall failure probabilities were found at 100, 100, 1 and 1% for the inlay, endoinlay, endocrown, and classical crown restorations, respectively in the normal biting. The corresponding values for clenching were over 100% for inlay and endoinlay restorations and about 87 and 70% for endocrown and classical crown, respectively. This numerical investigation suggests that endocrown and classical crown restorations for endodontically treated premolars with MO preparation present similar longevity.