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Analysis of Post on Dentinal Stress of Maxillary Central Incisor Restored with PFM Crown with Three dimensional Finite Element Method

Tang Gaoyan,Wen Zhihong,Cao Yonglie College of Stomatology, West China University of Medical Sciences Fan Yubo Department of Civil Engineering and Applied Mechanics,Sichuan Union University  
The purpose of the study was to know how the posts affected the dentinal stress distribution of maxillary central incisor restored with porcelain fused to metal crown(PFM)by using the three dimension finite element method. A selected standard maxillary incisor was embedded with resin,sectioned transversely with spiral CT,and photographs made of these cross sections were digitized. Finally a three dimentsion finite element model which consisted of alveolar bone, periodontal membrane,dentin, SDA Ⅱ alloy post and PFM similar to the clinical structure was constructed by use of Super SAP(93rd edition)on a personal computer,and then the dentinal stress distribution were analyzed before and after post installation. The results showed that when subjected to masticatory loading,the post restoration changed the pattern of dentinal stress distribution with increasing the area of high stress distribution in dentin, but decreased the peak stress of dentin(Von mises stress was reduced 13 9%,maximum principle stress was reduced 7 05%). Such mechanical analysis results suggest that rational post restoration prevents teeth from fracture.
【CateGory Index】: R783.3
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