下颌第一磨牙邻面不同高度缺损髓腔固位冠的生物力学分析  

Biomechanical Analysis of Endocrown of Mandibular First Molar with Different Proximal Heights

作　　者：吴帆[1] 曹谅[1] 姜晓南 赵阿莉[1] 张国庆[1] 王利民[1] 王卫国[1] 

机构地区：[1]中国人民解放军第一一七医院,浙江杭州310013

出　　处：《口腔医学研究》2018年第1期65-68,共4页Journal of Oral Science Research

基　　金：国家自然科学基金资助(编号:81600916)

摘　　要：目的:比较下颌第一磨牙邻面不同高度缺损下髓腔固位冠修复受力后剩余牙体组织以及修复体应力大小及分布情况,为临床选择修复方案提供参考。方法:利用有限元法建立不同邻面缺损高度的下颌第一磨牙模型,并给予髓腔固位冠修复,模拟正常人咬合,施加垂直向及斜向载荷,记录两种载荷下不同邻面高度的髓腔固位冠剩余牙体组织和修复体应力大小和分布情况。结果:在2种载荷下,不同组剩余牙体组织以及髓腔固位冠的应力分布相似,且随着邻面剩余高度的减小,剩余牙体组织以及髓腔固位冠的EQV应力峰值均在不断增大。结论:邻面高度的降低会增大髓腔固位冠以及剩余牙体组织的应力,增大牙齿以及髓腔固位冠折裂的可能性。Objective：To compare the stress and its distribution of the residual tooth tissue and the restoration of the mandibular first molar with proximal defect with different heights so as to provide reference for the clinical repair plan.Methods：The mandibular first molar model with proximal defects at different heights was established by finite element method and repaired with endocrown.Then,the vertical and oblique loads were applied,and the size and distribution of EQV stress of residual tooth tissue and restoration were recorded.Results：The EQV stress distribution of the residual tooth tissue and the endocrown was similar in different groups.The maximum EQV stress of the residual tooth tissue and the endocrown increased with the decrease of the residual height.Conclusion：The decrease of the proximal height increases the stress of the endocrown and the residual tooth tissue,and increases the possibility of fracture of the tooth and endocrown.

关 键 词：三维有限元分析 等效应力 髓腔固位冠 邻面龋 

分 类 号：R783.2[医药卫生—口腔医学]