上中切牙切1/3斜折两种修复方式的动态载荷有限元分析  

A Dynamic 3D Finite Element Analysis of Two Restoration Methods of Maxillary Central Incisors with Incisal Oblique Fracture

作　　者：徐乐乐 王孟飞 毕佳慧 姚明 程涛[1] XU Lele;WANG Mengfei;BI Jiahui;YAO Ming;CHENG Tao(Department of Stomatology,the First Affiliated Hospital of Zhengzhou University,Zhengzhou 450052,Henan,China;College of Mechanical and Electrical Engineering,Zhongyuan University of Technology,Zhengzhou 451191,Henan,China)

机构地区：[1]郑州大学第一附属医院口腔种植修复科,河南郑州450052 [2]中原工学院机电学院,河南郑州451191

出　　处：《中国美容医学》2023年第12期51-56,共6页Chinese Journal of Aesthetic Medicine

摘　　要：目的:通过动态三维有限元方法分析上中切牙切1/3斜折采用树脂直接修复与瓷贴面修复后的应力分布。方法:利用CBCT及三维有限元软件,构建上中切牙切1/3斜折的三维有限元模型,并对其进行两种修复方式模型建立,分析两组模型在一定动态载荷加载时间内,Von Mises应力、最大主应力分布及其峰值变化。结果:在模拟上中切牙动态咬合过程中,复合树脂修复组与瓷贴面修复组应力均主要集中于切1/3、颈1/3剩余牙体组织;瓷贴面组牙釉质的Von Mises应力和最大主应力明显低于复合树脂组;瓷贴面组牙本质的Von Mises应力明显低于复合树脂组,牙本质最大主应力两组相仿。结论:复合树脂修复组与瓷贴面修复组在上中切牙切1/3斜折动态咬合加载过程中的应力分布均主要集中于切1/3、颈1/3剩余牙体组织。瓷贴面修复体较复合树脂修复,牙体组织所受应力明显减小,减少了牙体组织折裂的可能性。Objective The dynamic three-dimensional finite element method was used to analyze the stress distribution of the upper central incisor incisal 1/3 oblique fracture repaired by composite resin and porcelain veneer.Methods Using CBCT and 3D finite element software,a 3D finite element model of the upper central incisor with an oblique fracture of incisal 1/3 was constructed,and two repair methods were established for it.The Von Mises stress,the maximum principal stress distribution and their peak value changes were analyzed for the two groups of models within a certain dynamic load loading time.Results During the simulation of dynamic occlusion of the upper central incisor,the stress of the composite resin restoration group and the porcelain veneer restoration group were mainly concentrated in the incisal 1/3 and the cervical 1/3 of the remaining tooth tissue.The Von Mises stress and maximum principal stress of the enamel of the porcelain veneer group were significantly lower than those of the composite resin group.The Von Mises stress of the dentin in the porcelain veneer group was significantly lower than that of the composite resin group.Conclusion The stress distribution of 1/3 and 1/3 of the remaining teeth in the upper middle incisor was mainly concentrated in the composite resin repair group and the porcelain veneer repair group.Compared with the composite resin repair group,the stress on the tooth tissue in the porcelain veneer repair group was significantly reduced,which reduced the possibility of tooth fracture.

关 键 词：树脂修复 瓷贴面修复 牙折裂 有限元分析 动态载荷 

分 类 号：R783.3[医药卫生—口腔医学]