The three-dimension finite element analysis on stress of different materia post-core of posterior tooth with or without PFM
- VernacularTitle:有和无全冠保护时不同材料的后牙桩核修复体有限元模型的应力分析
- Author:
Gang FU
- Publication Type:Journal Article
- Keywords:
Three-dimension finite element;
Stress;
Post-core;
PFM
- From:
Journal of Chongqing Medical University
2007;0(12):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To compare influence the residual dentin stress of posterior teeth post-core different materials with or without porcelain fused metal crown (PFM), in order to instruct clinically rational choice of materials. Method:Models were created by abrasive methnd which piclures were acqiured with digital camera. Three-dimensional models of maxillary first molar short in medial palatal cusp were constructed and restored with of different materials post-core on condition of having or not having PFM. Then the magnitude and distribution of model residual dentin stress were analyzed by the three-dimension finite element analysis. Result:1 When maxillaU first molar which is short in medial palatal cusp was restored with post-core and porcelain fused mental crown, its peak value of stress was evidently less than that with post-core but without porcelain fused mental crown, meanwhile, they had different stress distribution. 2 When maxillary first molar which is short in medial palatal cusp was restored with post-core and porcelain fused mental crown, post-core of different materials had little influence on peak value of stress of residual dentin, but post-core of high elasticity modulus change normal dentin stress distribution, while post-core of low elasticity modulus did not. Conclusion:On the condition of normal occlusal force, PFM is extremely important to protect no-vital tooth, which is crucial for successful post-core crown. Meanwhile, post-core of different materials show little difference in fracturing rate of tooth restored with post-core and porcelain fused menial crown, and the fracture namely happen.
