Estimation of the risk of failure for an endodontically treated maxillary premolar with MODP preparation and CAD/CAM ceramic restorations.
BACKGROUND
This study evaluated the risk of failure for an endodontically treated premolar with mesio occlusodistal palatal (MODP) preparation and 3 different computer-aided design/computer-aided manufacturing (CAD/CAM) ceramic restoration configurations.


METHODS
Three 3-dimensional finite element (FE) models designed with CAD/CAM ceramic onlay, endocrown, and conventional crown restorations were constructed to perform simulations. The Weibull function was incorporated with FE analysis to calculate the long-term failure probability relative to different load conditions.


RESULTS
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 2 restorations. Weibull analysis revealed that the individual failure probability in the endocrown enamel, dentin, and luting cement obviously diminished more than those for onlay and conventional crown restorations. The overall failure probabilities were 27.5%, 1%, and 1% for onlay, endocrown, and conventional crown restorations, respectively, in normal occlusal condition.


CONCLUSIONS
This numeric investigation suggests that endocrown and conventional crown restorations for endodontically treated premolars with MODP preparation present similar longevity.
Lin
Chun-Li
CL
Department of Mechanical Engineering, Chang Gung University, Tao-yuan, Taiwan. cllin@mail.cgu.edu.tw
Chang
Yen-Hsiang
YH
Pa
Che-An
CA
D001641:Bicuspid / Q000473:pathology*; D017076:Computer-Aided Design; D003442:Crowns; D003738:Dental Cements / Q000737:chemistry; D003743:Dental Enamel / Q000648:ultrastructure; D003776:Dental Porcelain; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000145:classification; D003804:Dentin / Q000648:ultrastructure; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional; D007284:Inlays; D008437:Maxilla; D011176:Post and Core Technique; D018570:Risk Assessment; D012390:Root Canal Therapy; D013314:Stress, Mechanical; D019246:Tooth Preparation / Q000145:classification*; D019553:Tooth, Nonvital / Q000628:therapy*; D017211:Treatment Failure; D055114:X-Ray Microtomography
D003738:Dental Cements; D003776:Dental Porcelain