微创修复用于短冠磨牙的三维有限元非线性应力分析  

3D Finite Element Non-linear Stress Analysis of Minimal Invasive Prosthesis for Short Coronal Molars

作　　者：廖莹 黄怡 LIAO Ying;HUANG Yi(Department of Stomatology,The First Affiliated Hospital of Jinan University,Guangzhou 510630,China;School of Stomatology,Jinan University,Guangzhou 510632,China;Dental Interdisciplinary Clinical Research Platform,Jinan University,Guangzhou 510632,China)

机构地区：[1]暨南大学附属第一医院口腔科,广东广州510630 [2]暨南大学口腔医学院,广东广州510632 [3]暨南大学口腔交叉学科临床研究平台,广东广州510632

出　　处：《口腔医学研究》2023年第11期988-994,共7页Journal of Oral Science Research

基　　金：暨南大学教学改革项目实践教学专项(编号:JG2021081)。

摘　　要：目的:利用三维模型重建及有限元应力分析方法,着重对短冠磨牙牙体缺损中适用的微创修复方式——髓腔固位冠与牙合贴面的von Mises应力分布进行分析研究。方法:选择一健康、完整的右侧下颌第一磨牙作为实验样本并建立其三维有限元模型,将冠部压缩至4 mm模拟短冠磨牙,再模拟行根管治疗(根管形成锉为25/06)后行髓腔固位冠与牙合贴面修复,生成空白对照组、髓腔固位冠组与牙合贴面组,在设定的力学参数下使其模拟咀嚼运动,记录3组模型的整体及各部分等效应力的大小及分布情况。结果:剩余牙本质近中根等效应力最大值:空白对照组(105.30 MPa)>髓腔固位冠组(88.95 MPa)>牙合贴面组(75.47 MPa)。结论:从对剩余牙体组织保护的角度来看,牙合贴面组能将应力更均匀的分布在牙根部,且其剩余牙体组织的应力峰值较髓腔固位冠组更低。Objective:To study von Mises stress distribution of endocrown and occlusal veneer applied to tooth defect of short coronal molars using three dimensional finite element non-linear stress analysis methods.Methods:A healthy and complete right mandibular first molar was selected and established three-dimensional finite element model.The crown was squeezed to 4 mm,then simulated with root canal therapy(master apical file was 25/06)and restored with endocrown or occlusal veneer.Under the set mechanical parameters,mastication motion was simulated,the value and distribution of equivalent stress in the whole and each part of the model were recorded.Results:The maximum residual dentine mesial root equivalent stress was:the control group(105.30 MPa)>endocrown group(88.95 MPa)>occlusal veneer group(75.47 MPa).Conclusion:From the perspective of protecting the remaining tooth tissue,the occlusal veneer can distribute stress more evenly at the root of the tooth and lower the peak stress in the remaining tooth tissue.

关 键 词：三维有限元 非线性分析 髓腔固位冠 牙合贴面 短冠磨牙 

分 类 号：R783.3[医药卫生—口腔医学]