种植义齿修复不同牙弓形态上前牙缺失的三维有限元分析  

Three-dimensional finite element analysis of implant denture for anterior tooth missing with different arch shapes

作　　者：王仲达 王屹博[1] 丁超[1] 史久慧[1] Wang Zhong-da;Wang Yi-bo;Ding Chao;Shi Jiu-hui(Qunli Campus,the First Affiliated Hospital of Harbin Medical University,Harbin 150001,Heilongjiang Province,China)

机构地区：[1]哈尔滨医科大学附属第一医院群力院区,黑龙江省哈尔滨市150001

出　　处：《中国组织工程研究》2018年第30期4818-4823,共6页Chinese Journal of Tissue Engineering Research

摘　　要：背景:牙弓形态的不同主要体现于前牙排列的差异,其对种植体周围应力分布有一定影响。目前对种植体支持式固定桥的三维有限元分析多在同一牙弓下进行,对不同形态牙弓下种植体支持式固定桥的生物力学研究较少。目的:利用三维有限元法,对方圆形、卵圆形及尖圆形3种牙弓形态种植体支持式固定桥进行生物力学分析。方法:依据人体颌骨锥形束CT资料,分别建立方圆形、卵圆形及尖圆形牙弓种植体支持式固定桥及其周围骨组织的三维有限元模型。沿牙冠长轴倾斜45°由舌侧向唇侧加载300 N(中切牙、侧切牙及尖牙牙冠各100 N)的力,分析种植体周围皮质骨、松质骨的Von-Mises应力分布及种植体-基台复合体位移值。结果与结论:尖圆形牙弓种植体周围皮质骨、松质骨的Von-Mises应力峰值较其余两组大,其种植体-基台复合体的最大位移较其余两组大;方圆形牙弓种植体周围皮质骨、松质骨的Von-Mises应力峰值最小,其种植体-基台复合体的最大位移较其余两组小;卵圆形牙弓结果介于二者之间。结果表明,方圆形牙弓种植体支持式固定桥表现出比尖圆形、卵圆形牙弓种植体支持式固定桥更低的应力值与更为理想的应力分布。BACKGROUND:The difference of dental arch shape mainly refers to different anterior tooth arrangement,and the shape of dental arch has a certain influence on the peri-implant stress distribution.Current three-dimensional finite element analysis for implant-supported denture mainly focuses on the same dental arch shape,and little is reported on the biomechanical difference of different dental arch shapes.OBJECTIVE:To compare the biomechanical behaviors of implant-supported fixed partial denture with square,oval and tapered arch shapes using the method of three-dimensional finite element analysis.METHODS:Based on the Cone-beam CT data of the human jaw,three kinds of models of implant-supported fixed partial denture and the surrounding bone were established.The force of 300 N(100 N of incisor,lateral incisor or canine crown)was applied to the fixed bridges at an angle of 45o alone the long axis of the tooth from labial side to lingual side to evaluate the Von-Mises stress distribution of cortical bone and cancellous bone and the displacement of implant-abutment complex.RESULTS AND CONCLUSION:The Max EQV stress in the cortical bone and cancellous bone around the implant in the three models were ranked as tapered model>oval model>square model,and the Max displacement of the implant-abutment complex in the three models were ranked as tapered model>oval model>square model.Overall findings indicate that the square arch shape shows lower stress and better stress distribution than the other two arch shapes.

关 键 词：三维有限元 三维重建 牙弓形态 种植体支持式固定桥 生物力学 Von-Mises应力峰值 Von-Mises应力分布 生物材料 牙种植体 牙弓 义齿 局部 固定 生物力学 组织工程 

分 类 号：R318[医药卫生—生物医学工程]