动态载荷下不同方式修复牙重度楔状缺损有限元分析  

Estimation of biomechanical behavior in deep wedge-shaped defects restored by different methods under static and dynamic loads:a 3D finite analysis

作　　者：王静[1] 殷金萍 林华洁 孙亚丽 WANG Jing;YIN Jin-ping;LIN Hua-jie;SUN Ya-li(Department of Stomatology,First Affiliated Hospital of Zhengzhou University,Zhengzhou 450000,Henan Province,China)

机构地区：[1]郑州大学第一附属医院口腔医学中心,河南郑州450000

出　　处：《上海口腔医学》2022年第6期615-620,共6页Shanghai Journal of Stomatology

基　　金：河南省医学科技攻关计划(联合共建)项目(LHGJ20190201)。

摘　　要：目的:分析不同方式修复下颌第二前磨牙重度楔状缺损后,在静动态载荷下的应变规律,为临床上重度牙楔状缺损修复方式的选择提供理论依据。方法:建立右侧下颌第二前磨牙重度楔状缺损模型,以根管治疗后未修复模型为对照组,树脂充填(A组)、桩修复后树脂充填(B组)、树脂充填后冠修复(C组)和树脂充填后桩冠修复(D组)为实验组;根据桩材料不同,将B、D组分为纤维桩(B1、D1)组和纯钛桩(B2、D2)组。利用三维有限元进行静、动态加载,分析不同载荷下修复前、后的应力变化。结果:静、动态载荷下,静态加载下的应力值远小于动态加载,各实验组模型剩余牙体组织Von Mises峰值及最大主应力均较对照组显著降低。桩修复组中,纤维桩修复后桩及牙根的Von Mises应力分布较纯钛桩更为均匀。结论:动态冲击载荷对应力分布具有较大影响。全冠修复有利于重度楔状缺损剩余牙体组织应力分布。当根管内需置桩时,应选择纤维桩。PURPOSE:To analyze the biomechanical properties of the right mandibular second premolar with deep wedge-shaped defects under static and dynamic loads by finite element method,so as to select appropriate repair method in clinic.METHODS:To establish the deep wedge-shaped defect model of the right mandibular second premolar,the unrepaired model after root canal treatment was used as the control group,and resin filling(group A),resin filling after post restoration(group B),crown restoration after resin filling(group C),post and crown restoration after resin filling(group D) were used as the experimental groups.According to different materials,group B and group D were further divided into fiber post(B1,D1) group and pure Ti post(B2,D2) group.Static and dynamic loading were applied by three dimensional finite element analysis software,and the stress and strain were analyzed before and after restoration.RESULTS:Compared with the control group,the stress values under static loading was much lower than that under dynamic loading.Von Mises and the maximum principal stress in each experimental group decreased significantly under static and dynamic loading.In the post group,the stress distribution of fiber post was more uniform than that of pure Ti post.CONCLUSIONS:Dynamic load has great influence on the stress distribution.Full crown restoration is beneficial to the stress distribution of the teeth with deep wedge-shaped defects.If a post is necessary,fiber post should be selected.

关 键 词：三维有限元 牙重度楔状缺损 静态加载 动态加载 修复方式 

分 类 号：R783.1[医药卫生—口腔医学]