摘要
目的 :生理加载下不同牙位种植体周围骨应力有明显差异 ,采用有限方法计算 ,其结果是种植体设计和临床使用的重要依据 ,但可靠性依赖于模型和加载条件的准确性。方法 :本文基于下颌骨四个典型牙位的CT数据 ,结合各牙位咬合关系的测量结果 ,建立了三维有限元模型 ,并对圆柱状种植体周围骨的应力分布进行有限元分析。结果 :种植体沿长轴植入时 ,各牙位应力分布差异较大 ,颊、舌侧应力分布明显不对称 ,应力均主要集中在种植体颈部与牙槽骨界面顶端的舌侧 ,且舌侧极大值为颊侧的2~3倍。结论 :在种植体 -骨界面上的最大应力不超过20MPa的条件下 ,各牙位能承受的最大力分别为:第二磨牙100N、第二前磨牙300N、尖牙180N、中切牙120N。第二磨牙采用牙槽骨垂直方向植入时 ,可承受约250N的力。
Objective:It's a very important method for the design and clinical utilization to analyze the stress distribuˉtion in bone around dental implant for different teeth by FEA,but the reliability of result is greatly influenced by the approximation of model and loading condition.Method:For the four typical tooth positions,the3D FE models have been rebuilt based on CT data of the mandible and measurements of occlusive relation,and the stress distributions of bone around cylinder dental implant are analyzed.Result:As the implant is inserted the long axial direction of mandible,there are evident dissimilarity in the stress distributions for different teeth and obvious concentration near the implant,the maximal stress of lingual side is2-3times higher than that of bucˉcal side.Conclusion:In the condition of the maximal stress on the interface of bone-implant less than20MPa,for the2 nd molar、2 nd premolar、canine and incisor,the critical chewing stress is:100N、300N、180N and120N respectively.When the implant of2 nd molar is put into vertical direction,it can support250N load.This result can provide reference for clinic application.
出处
《中国口腔种植学杂志》
2004年第3期101-105,共5页
Chinese Journal of Oral Implantology
基金
国家生物医学材料工程技术研究中心基金资助
关键词
牙种植体
应力分布
有限元分析
dental implant
stress distribution
finite element analysis