上中切牙桩核冠修复黏接剂厚度与应力的研究  

Three dimensional finite element stress analyses of post and core restored maxillary central incisor with different thickness of bonding layer

作　　者：王瑞霞[1] 李建[1] 邵勇[2] 王向东[2] 

机构地区：[1]南京医科大学口腔医学院特诊科,南京210029 [2]河海大学土木工程学院工程力学系基础力学教研室,南京210098

出　　处：《口腔医学》2005年第2期88-89,共2页Stomatology

基　　金：江苏省教育厅自然科学研究基金项目 (0 2KJD3 2 0 0 0 7)

摘　　要：目的　应用三维有限元方法研究桩核黏接剂层的厚度对牙本质应力的影响。方法　建立上中切牙桩核冠修复体三维有限元模型,分析当黏接剂层厚度分别为5 0、10 0、15 0、2 0 0 μm时牙本质的应力大小及分布。结果　随着黏接剂层的增厚,牙本质内的最大主应力和VonMises应力的峰值均呈上升趋势。各组最大主应力的峰值均位于牙本质舌侧颈部,而VonMises应力的峰值在黏接剂厚度达到2 0 0 μm时位于根尖部。结论　在进行桩核修复时黏接剂层厚度增加可致牙体应力的增加;随着黏接剂厚度的增加,牙体应力峰值可向根尖部转移。Objective To study the effect of the thickness of bonding layer on the stress distribution in the dentin. Methods A 3D-FEM model of a post and core restored maxillary central incisor was built. The stress of the dentin was investigated with different thickness of the bonding layer. Results The stress in dentin had an increasing tendency with the increase of the bonding layer. At the same time, the stress distribution in dentin had an increasing tendency from tooth cervical part to the apex part of the root. Conclusion In clinic work,the bonding layer between the canal and the post should be as thin as possible to avoid the high stress concentration in dentin.

关 键 词：桩核冠 三维有限元分析 黏接剂 

分 类 号：R783.3[医药卫生—口腔医学]