不同肩台宽度的下前牙全瓷联冠的有限元分析  

Finite element stress analysis of all-ceramic continuous crowns of the lower anterior teeth in differential shoulder thickness

作　　者：欧阳少波[1] 王军[2] 张洪斌[1] 廖岚[1] 朱洪水[1] 

机构地区：[1]南昌大学附属口腔医院修复科,江西南昌330006 [2]南昌大学第二附属医院口腔科,江西南昌330006

出　　处：《上海口腔医学》2014年第2期160-165,共6页Shanghai Journal of Stomatology

基　　金：江西省教育厅项目(GJJ09130)~~

摘　　要：目的:采取有限元分析研究肩台宽度变化对3种不同全瓷材料的下颌中切牙联冠修复的影响。方法:利用下颌中切牙全瓷联冠的三维有限元模型,对3种不同全瓷材料以及肩台宽度变化的全瓷联冠进行垂直向和唇向45°大面积加载120 N,并采用Abaqus 6.11软件包对数据进行力学分析。结果:利用CBCT、Mimics10.01软件及Abaqus 6.11软件建立了下颌中切牙全瓷联冠、基牙、牙周膜和牙槽骨的三维有限元模型。不同全瓷材料和肩台宽度对牙周膜、牙槽骨的等效应力峰值几乎无影响。同一肩台宽度下,大面积加载120 N时,3种全瓷联冠中冠受到的拉应力最大为In-Ceram Alumina,其次为In-Ceram Zirconia,最小为IPS.Empress2。唇向45°大面积加载120 N时,IPS.Empress2随着肩台宽度增加,冠边缘的最大拉应力值上升。结论:建立的三维有限元模型具有很好的几何相似度,在所设定的条件范围内,全瓷材料的弹性模量越大,联冠受到的拉应力也越大。PURPOSE：To investigate the stress distributions under load in 3 types of all-ceramic continuous crowns of the lower anterior teeth with differential shoulder thickness. METHODS： Cone-beam CT （CBCT） was used to scan the in vitro mandibular central incisors, and achieve three-dimensional finite element model of all-ceramic continuous crowns with different shoulder width by using Mimics, Abaqus software. Different load conditions were simulated based on this model to study the effect of shoulder width variation on finite element analysis of 3 kinds of different all-ceramic materials of incisors fixed continuous crowns of the mandibular. RESULTS： Using CBCT, Mimicsl0.01 software and Abaqus 6.11 software, three-dimensional finite element model of all-ceramic continuous crowns of the mandibular incisor, abutment, periodontal ligament and alveolar bone was established. Different ceramic materials and various shoulder width had minor no impact on the equivalent stress peak of periodontal membrane, as well as alveolar bone. With the same shoulder width and large area of vertical loading of 120 N, the tensile stress was the largest in In-Ceram Alumina, followed by In-Ceram Zirconia and the minimum was IPS.Empress II. Under large area loading of 120 N 45° labially, when the material was IPS.Empress II, with the shoulder width increased, the porcelain plate edge of the maximum tensile stress value increased, while the other 2 materials had no obvious change. CONCLUSIONS：Finite element model has good geometric similarity. In the setting range of this study, when the elastic modulus of ceramic materials is bigger, the tensile stress of the continuous crown is larger.

关 键 词：有限元分析 全瓷联冠 应力分布 三维有限元模型 

分 类 号：R783.1[医药卫生—口腔医学]