摘要
目的:利用计算机生成下颌中切牙的三维实体模型和三维有限元模型,生物力学角度分析瓷贴面复合体粘接层的受力情况,以期为临床应用提供理论依据。方法:将Micro-CT获得的牙体原始数据导入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三维有限元模型;用有限元法分析瓷贴面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,并进行应力分析。结果:获得较为精准的下颌中切牙三维实体模型和三维有限元模型;应力云图可见:垂直载荷下,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:下颌中切牙瓷贴面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附近时更有利于瓷贴面的粘接效果。
Objective: To generate a three-dimensional(3D) computerized solid model and finite element model of the mandibular central incisor, and to use the models on biomechanical analysis of stress distribution of the adhesive layer under the porcelain laminate veneer for more supporting evidence of the clinical applications. Methods: Raw data were collected from the mandibular central incisor through micro computed tomography(Micro-CT) and analyzed by the software Mimics10.01, and then a 3D solid model and finite element model were generated by topo algorithm and Ansa software. A 3D finite element analysis was conducted on the stress distribution of the complex of different thickness of the adhesive layer under the porcelain veneer in varying loading conditions, and the ABAQUS/Standard solver was used to solve the models. Results: A precise 3d solid model and 3d finite element model of the mandibular central incisor were obtained. The stress nephogram showed that for the vertical loading, Von Mises stress was mainly concentrated on distal 1/3 of the lingual surface and middle 1/3 of the incisal area of the adhesive layer; for the oblique loading, Von Mises stress was mainly concentrated on distal 1/3 of the labial incisal area and distal 1/3 of the lingual cervical area. Von Mises stress of oblique loading was more powerful than the one of vertical loading; Von Mises stress showed the minimum power in the adhesive thickness of 100um under varying loading conditions. Conclusions: During porcelain veneer restoration of the mandibular central teeth, attention should be paid on the edge of the incisal area of the adhesive layer that guides the extension of the stress along the long axis of the teeth. The adhesive layer thickness of 100um is optimal for the bonding of porcelain veneer.
出处
《口腔颌面修复学杂志》
2014年第2期84-87,共4页
Chinese Journal of Prosthodontics
关键词
下颌中切牙
瓷贴面
有限元分析
应力分布
mandibular central incisors
porcelain laminate veneer
finite element analysis
stress distribution
