论文部分内容阅读
目的研究上颌中切牙采用不同材料桩核修复后的牙本质应力大小及分布情况,为临床桩核材料的选择提供理论依据。方法建立标准上颌中切牙模型,利用ANSYS12.0操作软件在模型上对钴铬合金桩核,玻璃纤维桩核及全瓷桩核修复后的牙本质应力数值及分布情况进行三维有限元分析。结果在三组中牙本质的第一主应力及Von Mises应力峰值均在牙根上1/3靠近牙颈部侧,应力大小顺序为:钴铬合金桩核组>全瓷桩核组>玻璃纤维桩核组;且应力值沿桩核与牙本质交界面从牙颈部至根尖呈递减趋势。结论桩冠根管预备时应尽可能保留牙颈部唇侧牙本质;弹性模量较高的桩核材料易形成根折,临床上应根据患者牙根情况,选择弹性模量合适的桩核修复牙体缺损。
Objective To study the stress distribution and distribution of dentine after the restoration of maxillary central incisor with different materials of post and core, so as to provide theoretical basis for the selection of clinical post core material. Methods A standard maxillary central incisor model was established. Three-dimensional finite element analysis of dentin stress values and distributions of cobalt-chromium alloy post, glass fiber posts and all-ceramic posts was performed on the model using ANSYS software. Results The peak values of the first principal stress and Von Mises stress of dentin in the three groups were on the upper root 1/3 of the dentinal neck. The order of the stress was: cobalt-chromium alloy post-core group> all-ceramic post-core group> glass fiber Pile-core group; and the stress value decreases along the interface between the post core and dentin from the cervical part to the root tip. Conclusions Root canal dentin should be preserved as far as possible in root canal preparation of post crown. The root core material with high modulus of elasticity is easy to form root fracture. According to the condition of root, the appropriate post-core restoration should be selected Dental defects.