The three-dimension finite element analysis of stress in posterior tooth residual root restored post-core crown of different loading direction

Objective:To analyze the stress magnitude and distribution of remaining dentin in posterior tooth residual root restored with post-core crown using three-dimension finite element method. And then to discuss the rational core design when repairing posterior tooth root post-core crown. Methods:The models of residual root of maxillary first molar restored with post-core crown were created by CT scanning,Mimics software and Abaqus software. Different number,length and material of post were used in the modeling. The post was cemented with zinc-phosphate cement. A load of 240 N was applied to the occlusal surface in four directions and tensile,shear,and von Mises stresses were calculated. Results:The maximum stress on remaining dentin increased markedly with increasing of loading angle. Conclusion:The loading angle have influence on magnitude and distribution of stress. The influence from loading angle is most apparent.