上颌无牙颌种植固定修复中种植体位置对应力分布的影响  

The influence of the loeation of implants on the distribution of stresses in fixed dentures for edentulous maxlla

作　　者：苏峰梅[1] 张晓真[1] 赵毅[1] 汤春波[1] 周储伟[2] 孙玉林[2] 丁月新[2] 

机构地区：[1]南京医科大学附属口腔医院种植科,主治医师江苏210029 [2]南京航空航天大学航空宇航学院,教授江苏210016

出　　处：《中华老年口腔医学杂志》2016年第2期104-108,共5页Chinese Journal of Geriatric Dentistry

基　　金：国家自然科学基金(项目编号:81470778);江苏高校优势学科建设工程资助(项目编号:2014-37)

摘　　要：目的:在8颗种植体支持的上颌无牙牙合固定义齿修复设计中,通过对有限元模型的应力分布分析,选择最佳种植位点设计。方法:在牙列缺失上颌建立8颗种植体支持的6种固定义齿三维有限元模型。以国际牙科联盟的FDI牙位表示法命名,模型Ⅰ:11,13,15,17,21,23,25,27;模型Ⅱ:13,14,15,17,23,24,25,27;模型Ⅲ:11,14,16,17,21,24,26,27;模型Ⅳ:14,15,16,17,24,25,26,27;双侧不对称模型Ⅴ:11,14,15,17,21,24,25,26;模型Ⅵ:11,13,15,16,21,23,25,26。300N的应力垂直加载于固定义齿右侧第一、二磨牙近中舌尖颊斜面(与水平面呈30°角)。利用ABAQUS软件进行力学分析。结果:越靠近应力加载位置,种植体承担的应力越大,应力主要集中在磨牙区,且在末端种植体颊侧颈部显著集中,单端悬臂应力较双端悬臂应力更为集中。末端种植体应力由小到大依次为模型Ⅰ<模型Ⅵ<模型Ⅲ<模型Ⅳ<模型Ⅱ<模型Ⅴ,模型Ⅴ是模型Ⅰ的1.8倍。同一模型中,末端种植体承担应力是中间种植体的7倍。结论:种植体的位置排列影响应力分布,种植体分布越分散,越能有效分散咬合力,应力分配更为合理。Objective： To study stress distribution of eight impiants with different location on edentulous maxilla using the three-dimensional finite element methode. Methods：A three-dimensional finite element model of edentulous maxilla with eight implants restoration wsa established. According to the location of eight implants,there were six models：ModelⅠ ： 11, 13, 15, 17, 21, 23, 25, 27; Model Ⅱ ： 13, 14, 15, 17, 23, 24, 25, 27; Model Ⅲ ：11, 14, 16, 17, 21, 24, 26, 27; Model Ⅳ ： 14, 15, 16, 17, 24, 25, 26, 27; Model Ⅴ ：11,14,15,17,21,24,25,26; Model Ⅵ： 11,13,15,16,21,23,25,26..300 N vertical static force was loaded on the mesial-lingual cusps of the right first molar and second molar（obliquely 30° to the horizontal plane）respectively to simulate chewing. Equivalent stress values of implants on the edentulous maxilla model were calculated using ABAQUS software. Results： The stress mainly concentrated on？implants in the molar areas, especially on the buccal cervical of the terminal implants. The stress on terminal implants were arranged in order as follows： Model IModel VIModel IIIModel IVModel IIModel V. Model V was 1.8 times the stress of Model I. In the same model,the stress on？terminal implant was 7 times that on the mesial implants. Conclusion： The location of the implants affects the stress distribution. The more dispersive the positions are, the more ideal the stress distributes.

关 键 词：上颌无牙颌 种植体 固定义齿 三维有限元分析 

分 类 号：R783.6[医药卫生—口腔医学]