关键词: 上颌中切牙, 全瓷冠, 玻璃纤维桩, 边界条件, 三维有限元法

Abstract:

BACKGROUND: Restoration with post and core has been studied extensively by three-dimensional finite element method, but stress analysis under different boundary conditions has not been reported.
OBJECTIVE: After maxillary central incisors restored with all-ceramic crown fiber composite resin posts and cores, stress change under different boundary conditions is analyzed by three-dimensional finite element method.
METHODS: Maxillary central incisors of the involved subjects were scanned consecutively by three-dimensional spir CT, dicom data was used for establishing two sets of the same three-dimensional finite element models with medical image manipulation soft, Mimics10.01. The boundary conditions of two sets of models were defined friction relationships and all constraint relationships. Von mises stress and max principal stress of all-ceramic crown, residuary dentin and fiber post under two boundary conditions were analyzed by finite element analysis soft, Abaqus6.7.
RESULTS AND CONCLUSION: In friction relationships, the stress peak of all-ceramic crown and residuary dentin remarkably increased; while the peak of fiber post under two boundary conditions were almost similar; stress distributions of every unit were similar; it is indicated that boundary conditions cannot change the stress distribution of original tissues, but greatly influences the stress peak, fiber post will not reduce the peak stress of residual dentin.