摘要
目的应用三维有限元分析不同嵌体材料对下颌第二乳磨牙邻[牙合](Ⅱ类)洞型应力分布的影响。方法采用CB-CT扫描下颌第二乳磨牙,利用Mimics和Geomagic软件建立三维有限元模型,应用SoliderWorkS软件模拟制备下颌第二乳磨牙邻牙合(MO)洞型。本实验分为四组:垂直加载下树脂嵌体修复组(A)、垂直加载下瓷嵌体修复组(B)、舌向45°加载下树脂嵌体修复组(C)、舌向45°加载下瓷嵌体修复组(D)。再利用Abaqus有限元分析软件分别对树脂嵌体和瓷嵌体在垂直以及侧向力(舌向45°)的加载条件下进行有限元应力分析,测出模型的牙体主应力峰值及在两种方向应力加载下的嵌体修复后牙体的Von-mises应力分布情况。结果四组模型修复后的应力峰值分别为:(A)组为6.13MPa,(B)组为11.5MPa,(C)组为8.82MPa,(D)组为12.2MPa。侧向加载(舌向45°)时应力峰值高于垂直加载,四组应力峰值按照大小排列为:D组>B组>C组>A组。四组模型在牙体的应力分布峰值主要在洞底部的髓壁。结论在嵌体修复下颌第二乳磨牙邻[牙合](MO)洞型时,两种加载方式下,树脂嵌体修复后牙体组织的应力分布更均匀,在临床修复治疗中树脂嵌体更有利于减少牙体组织劈裂。
Objective To analyze the influence of different inlay materials on the stress distribution of adjacent occlusal cavity form(type Ⅱ) of mandibular second deciduous molar by using finite element method. Methods The mandibular second deciduous molar was scanned by CB-CT. A three-dimensional finite element model was established by Mimics and Geomagic software. SoliderWorkS software was used to simulate and prepare the adjacent molar occlusal(MO)cavity of mandibular second deciduous molar. There were four groups in the experiment: resin inlay repair group under vertical loading(A), porcelain inlay repair group under vertical loading(B), resin inlay repair group under loading with tongue direction of 45°, and porcelain inlay repair group under loading with tongue direction of 45°(D). Abaqus finite element analysis software was used for finite element stress analysis of the resin inlay and porcelain inlay under the loading conditions of vertical direction and lateral forces(tongue direction of 45°)to measure the primary stress peak of tooth in the model, and Von-mises stress distribution of tooth after inlay restoration under stress loading in two directions.Results The stress peaks of tooth after restoration in four groups were: 6.13 MPa in group(A), 11.5 MPa in group(B),8.82 MPa in group(C), and 12.2 MPa in group(D). The stress peak under lateral loading(tongue direction of 45°)was higher than that under vertical loading Stress peaks in the four groups were sorted by size: D groupB groupC groupA group. The stress peaks of tooth in four models were mainly distributed on the marrow wall at the bottom of the hole.Conclusion During inlay restoration of the adjacent molar occlusal(MO)cavity of mandibular second deciduous molar,under two loading modes, the stress distribution of the tooth tissue after resin inlay restoration is more uniform. Thus, resin inlay is more conductive to reducing dental tissue fracture in clinical restoration treatment.
作者
焦海斌
吕学超
黄鹏飞
刘英群
JIAO Haibin;LV Xuechao;HUANG Pengfei;LIU Yingqun(The Affiliated Hospital of Stomatology, Harbin Medical University,Harbin 150000)
出处
《现代口腔医学杂志》
CAS
2019年第4期207-210,共4页
Journal of Modern Stomatology
关键词
有限元分析
乳磨牙
Ⅱ类洞型
应力
Finite element analysis
Deciduous molar
Occlusal cavity form(type Ⅱ)
Stress
