全瓷材料及牙弓曲率对固定桥疲劳寿命影响的有限元分析  

Influence of arch curvature and all-ceramic materials on fatigue life of fixed bridges: a finite element analysis

作　　者：陆晓丰[1] 凌厉[1] 董宁 Lu Xiao-feng;Ling Li;Dong Ning(Department of Stomatology, Wuxi Mental Health Center affiliated to Nanjing Medical University, Wuxi 214000, Jiangsu Province, China;Wuxi Automation Equipment Services Co., Ltd., Wuxi 214000, Jiangsu Province, China)

机构地区：[1]南京医科大学附属无锡市精神卫生中心口腔科,江苏省无锡市214000 [2]无锡瑟维思通自动化设备有限公司,江苏省无锡市214000

出　　处：《中国组织工程研究》2018年第14期2174-2178,共5页Chinese Journal of Tissue Engineering Research

基　　金：无锡市医院管理中心面上项目(YGZXM1552)~~

摘　　要：背景:采用循环疲劳有限元方法研究修复体的疲劳寿命更符合口腔实际情况。目的:研究不同牙弓曲率下不同全瓷材料固定桥的疲劳寿命。方法:将全瓷固定桥数字模型按照牙弓曲率建立4组模型(0°设为Ⅰ组,30°设为Ⅱ组,60°设为Ⅲ组,90°设为Ⅳ组),每组模型分别采用In-Ceram Zirconia、Zenotec、Lava全瓷材料进行固定桥疲劳寿命分析。结果与结论:全瓷固定桥连接体是应力最集中的部位,也是应力极值部位、疲劳寿命最短的部位及最容易发生材料破损的部位。随着牙弓曲率的增加,In-Ceram Zirconia全瓷材料组疲劳寿命从4.6年下降到1.7年,Zenotec、Lava全瓷材料组均能保持19.6年的疲劳寿命;固定桥连接体是疲劳寿命最短的部位。结果表明,尖牙前后区域采用In-Ceram Zirconia全瓷固定桥修复体的预期疲劳寿命较短,可能不是合适的修复材料;Zenotec和Lava全瓷材料在不同曲率下都能满足临床使用的预期寿命。BACKGROUND： The cyclic fatigue finite element method is more useful to study the fatigue life of the prosthesis in accordance with the actual situation of the oral cavity. OBJECTIVE： To study the all-ceramic fixed bridge fatigue life with different arch curvatures and materials. METHODS： According to the arch curvature, four sets of models（group I, 0°; group II, 30°; group III, 60°; group IV, 90°） were set up on the basis of a digital model of all-ceramic fixed bridge. Fatigue life of each model was analyzed with different materials（In-Ceram Zirconia, Zenotec, LAVA）. RESULTS AND CONCLUSION： The stress was mostly concentrated at the join of the all-ceramic fixed bridge. Itwas also the most part of the stress extremum, the shortest part of fatigue life and the most easily damaged part of the material. With the increase of arch curvature, the fatigue life of Group In-Ceram Zirconia dropped from 4.6 to 1.7 years, while both Group Zenotec and Group LAVA had the fatigue life of 19.6 years. The part of minimum life was the join of the fixed bridge. These findings indicate that the expected fatigue life of In-Ceram Zirconia all-ceramic fixed bridge restoration is relatively short, which may be an inappropriate repair material in anterior and posterior positions of canine teeth. All-ceramic materials, Zenotec and Lava, can meet the clinical life expectancy under different curvatures.

关 键 词：牙弓 牙瓷料 疲劳 有限元分析 组织工程 全瓷材料 牙弓曲率 疲劳寿命 生物材料 口腔材料 S-N曲线 有限元 

分 类 号：R318[医药卫生—生物医学工程]