根骨内种植体植入牙槽骨吸收的中切牙的有限元应力分析  

Finite element analysis of the stress induced by an endodontic endosseous implant placed through a centeral incisor with periodontal compromises

作　　者：张春宝[1] 马轩祥[1] 张少峰[1] 张蓉[1] 

机构地区：[1]西安第四军医大学口腔医学院,710032

出　　处：《实用口腔医学杂志》2003年第2期103-106,共4页Journal of Practical Stomatology

基　　金：国家自然科学基金资助课题;资助号 :39470 759

摘　　要：目的 :研究分析Ⅱ度牙槽骨吸收的上颌中切牙植入根骨内种植体后的种植体 骨界面、牙本质以及牙周膜的应力特点。方法 :二维有限元应力分析法 ,根据王惠芸对中国成人上中切牙形态的统计数据 ,模拟牙根形态 ,建立有限元模型 ;10 0N垂直和斜向静力加载 ,采用Super sap( 1991年版本 )有限元分析软件 ,在PⅢ 5 5 0IBM兼容机上进行运算。结果 :根骨内种植体植入Ⅱ度牙槽骨吸收的单根牙后 ,可显著减小牙齿的松动度 ;垂直载荷作用时 ,可显著降低骨组织、牙周膜的VonMises应力、拉应力和压应力以及牙本质的VonMises应力和压应力水平。牙本质内的拉应力水平稍有增加。骨组织主要受压应力作用 ,应力集中区在种植体的尖端 ;斜向载荷时 ,牙槽嵴顶和牙周膜的应力水平较植入前有明显减小 ;而牙根尖部的牙本质和骨组织的各项应力水平则有显著的提高。结论 :根骨内种植体对牙周损害牙齿具有较好的稳定作用 。Objective: To study the stress in bone implant interface, dentin and periodontal ligament while an endodontic endosseous implant is placed through a centeral incisor with periodontal compromises. Methods: Two dimension finite element analysis method was used and finite element analysis (FEA) model of the Chinese adult central incisor with II degree looseness according the data from literature was established. A load of 100 N was applied vertically or at 45°to vertical. The stress in bone implant interface, dentin and periodontal ligament was measured and analysed with Super sap(1991 edition) FEA software in a IBM PC(PIII 550).Results: The mobility of the tooth was decreased by endodontic endosseous implant with periodontal compromises, and lower stress was observed at the alveolar crest and periodontal membrane after implantation with inclined load. High stress concentration on the implant/bone interface was produced below the canal orifice and implant apex, and at root apex within dentin.Conclusion: Endodontic endosseous implant can be used to stabilize the tooth with periodontal compromises, and to improve the stress distribution around the root.

关 键 词：根骨内种植体植入 牙槽骨吸收 切牙 有限元 应力分析 牙本质 牙周膜 

分 类 号：R783.3[医药卫生—口腔医学]