粘接剂种类对全瓷桩核冠修复效果影响的三维有限元分析  

Numerical analysis of the influence of agglomerant classes on stress distribution in all-ceramic post-core crown

作　　者：李冰[1] 武秀萍[1] 马雅静[1] 邓菁菁[1] 武啸[1] 

机构地区：[1]山西医科大学口腔医院修复科,山西太原030001

出　　处：《临床口腔医学杂志》2015年第8期459-461,共3页Journal of Clinical Stomatology

基　　金：山西省卫生计生委科研项目(2014094)

摘　　要：目的:分析不同粘接剂类型对前牙全瓷桩核冠系统在荷载作用下的应力分布情况的影响。方法:采用螺旋CT断层扫描技术和CAD建模软件相结合的方法,构建上颌中切牙的全瓷桩核冠三维有限元模型,加载牙合力,分析桩核冠经3种不同粘结剂(Panavia,3M Rely X Unicem,磷酸锌水门汀)粘固后,粘结剂层,核瓷层,饰瓷层的最大主应力分布。结果:在不同粘结材料的情况下,剩余牙本质的Von Mises应力和最大主应力分布情况基本一致。Von Mises应力主要集中在唇侧根颈1/3处,最大主应力(S1)主要集中在舌侧根颈1/3处。剩余牙本质的应力随着粘结剂弹性模量的增大而减小,粘结层的应力随着粘结剂弹性模量的增大而增大。结论:临床上在进行根管预备时,应尽量向近远中向扩展而保留更多的唇舌侧牙体组织,减小根颈1/3处根折发生的危险性。选择低弹性模量的粘结剂对保护桩粘结界面是有利的。Objective：To provide the basis for the design of clinical treatment of all-ceramic post-core crown of ante-rior teeth prosthodontics,the influence of agglomerant classes on the stress distribution in all-ceramic crowns under load was studied numerically. Method：The finite element analysis （FEA） model of a standard all-ceramic post-core crown of the upper mandible central incisor was established using spiral CT and CAD software ,strength was loaded,and ANSYS software was used to analyze the stress values of the core layer、the veneer layer and the agglomerant layer on three variety type of agglomerant,including the Panavia,the 3M RelyX Unicem,and the the zinc phosphate cement. Result：According to distri-bution of the stress pattern,Von mises stress is located on the lip side of the 1/3 root and the maximal tensile stress on the lingual side of the 1/3 root.Under the load,the stress in residual dentine was shown to be decreasing with increasing elas-tic modulus of adhesive material,the stress in adhesives layer was shown to be increasing with increasing elastic modulus of adhesive material. Conclusion：The clinical course of root canal preparation should be extended as far as possible in the near-and far,in order to retain morel lip and lingual tooth structure and to reduce the risk of occurrence of root fracture. It suggests that choosing lower elastic modulus of adhesive is able to protect bonding interface of post restoration.

关 键 词：粘结剂 全瓷冠 桩核冠 有限元分析 

分 类 号：R783.41[医药卫生—口腔医学] O242.21[医药卫生—临床医学]