精密附着体义齿修复下颌末端游离缺失的应力分析  

Stress analysis of precision attachment dentures for mandibular distal-extension edentulous cases

作　　者：黄庆丰[1] 金文忠[1] 张富强[1] 崔雯[2] 王冬梅[2] 

机构地区：[1]上海交通大学医学院第九人民医院口腔医学院口腔修复科上海市口腔医学重点实验室,上海200011 [2]上海交通大学机械与动力工程学院生物医学制造与生命质量工程研究所,上海200240

出　　处：《上海交通大学学报（医学版）》2009年第11期1291-1294,共4页Journal of Shanghai Jiao tong University:Medical Science

基　　金：“十一五”国家科技支撑计划重点项目(2007BAI18B05);上海市科学技术委员会资助项目(08DZ2271100);上海市重点学科建设项目(S30206);上海市重点(特色)学科建设项目(T0202)~~

摘　　要：目的对精密附着体义齿修复末端游离缺失的应力分布情况进行有限元分析。方法采用模块化方法建立下颌末端游离缺失修复体设计方案的三维有限元模型,包括组合式铸造卡环之RPI卡环组修复体模型和精密附着体义齿模型,后者分别以44为单基牙和4334联冠为基牙建模。将经HyperMesh 7.0软件完成有限元网格划分的修复体模型分别导入模拟工程有限元软件Abaqus 6.5,分析三种固位类型修复体设计中基牙及支持组织的应力分布情况。结果精密附着体义齿在垂直和斜向载荷下,双基牙设计基牙和基托下组织的应力都低于单基牙设计;RPI卡环组可摘局部义齿在斜向载荷下,基牙和基托下组织的应力均明显增加。结论在下颌末端游离缺失附着体义齿修复体设计中,应优先选择双基牙附着体修复。Objective To analyse the stress distribution of precision attachment dentures used in distal-extension edentulous cases. Methods The finite element models of conventional removable partial dentures and precision attachment dentures were established by modular denture model,and the models of precision attachment dentures were established with 4 4 as one abutment or 43 34 as two abutments. The stress distribution of abutments and supporting tissues was compared by finite element analysis software Abaqus 6.5. Results Under vertical loading or oblique loading,the stress of abutments and supporting tissues from attachment dentures with two abutments was significantly lower than that from attachment dentures with one abutment. The stress of conventional removable partial dentures significantly increased under oblique loading.Conclusion It is reasonable for the design of attachment dentures with two abutments for mandibular distal-extension edentulous cases.

关 键 词：末端游离缺失 附着体义齿 精密 有限元分析 

分 类 号：R783.6[医药卫生—口腔医学]