细小种植体支持可摘局部义齿修复末端游离缺失的应力分析  

Stress analysis of distal-extension removable partial dentures supported by mini implants

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1295-1298,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：目的分析细小种植体支持可摘局部义齿修复末端游离缺失的应力分布情况。方法采用模块化方法建立下颌末端游离缺失修复体设计三维有限元模型,包括组合式铸造卡环之RPI卡环组修复体(CRPD)模型和细小种植体支持可摘局部义齿修复体(ISRPD)模型。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,分析应力分布情况。结果垂直载荷下,ISRPD模型基牙及缺失区黏膜、牙槽骨的应力水平都低于CRPD模型。斜向载荷下,CRPD模型各部位应力都明显增大;ISRPD模型则仅在种植体颈部牙槽骨出现应力明显增大,而基牙牙体和牙周膜的应力反而下降。结论采用细小种植体支持的可摘局部义齿修复末端游离缺失,对基牙和缺失区软、硬组织的健康有利。Objective To analyse the stress distribution of distal-extension removable partial dentures supported by mini implants. Methods The finite element analysis models of conventional removable partial dentures （CRPD） and mini implants supported removable partial dentures （ISRPD） were established by modular denture model.The stress distribution of abutments and supporting tissues was compared by finite element analysis software Abaqus 6.5. Results Under vertical loading,the stress of abutment teeth,mucosa of edentulous region and alveolar bone of ISRPD model was lower than that of CRPD model. Under oblique loading,the stress of each part of CRPD model and alveolar bone of ISRPD model significantly increased,while that of abutment teeth and parodontium of ISPRD model decreased. Conclusion The distal-extension removable partial dentures supported by mini implants work well in protecting the abutments and supporting tissues.

关 键 词：末端游离缺失 种植体支持可摘局部义齿 有限元分析 

分 类 号：R783.6[医药卫生—口腔医学]