对瓷贴面不同粘结层的三维有限元应力分析

发布时间：2018-03-08 05:16

本文选题：下颌中切牙　切入点：计算机微断层扫描　出处：《中国人民解放军医学院》2014年硕士论文　论文类型：学位论文

【摘要】：目的：利用计算机生成下颌中切牙的三维实体模型和瓷贴面（porcelain laminateveneer，PLV）复合体三维有限元模型，从生物力学角度分析PLV复合体不同粘接剂层的应力分布规律，以期为临床应用提供理论依据。方法：将计算机微断层扫描（micro-computed tomography，Micro-CT）获得的牙体原始数据，存储为DICOM格式；再导入逆向工程Mimics10.01软件，利用topo算法和ANSA软件生成下颌中切牙三维实体模型和PLV复合体的三维有限元模型；用有限元法分析PLV复合体不同厚度的粘接层在不同载荷条件下的应力分布规律，使用ABAQUS/Standard求解器对该计算模型求解，根据所得结果进行应力分析。结果：获得较为精准的下颌中切牙三维实体模型和PLV复合体的三维有限元模型；力学分析应力云图可见：垂直载荷条件下，Von Mises应力主要集中于舌面远中1/3处和粘接层切端中1/3处；斜向载荷条件下，Von Mises应力主要集中在唇面切端远中1/3处和舌面颈部远中1/3处；Von Mises应力值斜向加载均大于垂直向加载；不同载荷条件下粘结层厚度均为100um时Von Mises应力值最小。结论：下颌中切牙PLV修复应重点注意粘接层切端边缘的处理，并引导下颌牙齿延牙体长轴受力；树脂粘接层在厚度为100um附近时更有利于PLV的粘接效果。
[Abstract]:Objective: to analyze the stress distribution of different adhesive layers of PLV complex from biomechanical point of view by computer generated three-dimensional solid model of mandibular central incisor and three dimensional finite element model of porcelain veneer laminator complex. In order to provide theoretical basis for clinical application. Methods: the raw data obtained from micro-computed tomography micro-CTs were stored in DICOM format, and then imported into reverse engineering Mimics10.01 software. The three-dimensional solid model of mandibular central incisor and the three-dimensional finite element model of PLV complex were generated by topo algorithm and ANSA software, and the stress distribution of adhesive layer with different thickness of PLV complex under different loading conditions was analyzed by finite element method. The ABAQUS/Standard solver is used to solve the model, and the stress analysis is carried out according to the obtained results. Results: three dimensional solid model of mandibular central incisor and three dimensional finite element model of PLV complex were obtained. The stress cloud diagram of mechanical analysis shows that under vertical load, the Von Mises stress is mainly located at 1/3 points in the distal part of the tongue and 1/3 at the cutting end of the bonding layer. Under oblique loading, the Von Mises stress is mainly concentrated at the distal 1/3 of the incisal end of the lip and 1/3 of the tongue face and neck. The oblique loading values of the Von Mises stress are higher than those of the vertical load, and the Von Mises stress values are the smallest when the thickness of the bond layer is 100um under different loading conditions. Conclusion: the PLV repair of mandibular central incisor should pay more attention to the treatment of the edge of the incised end of the adhesive layer and guide the force of the long axis of the mandibular tooth and the resin adhesive layer is more favorable to the adhesive effect of PLV when the thickness of the adhesive layer is about 100um.
【学位授予单位】：中国人民解放军医学院
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：R783

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