三种下颌种植固定全口义齿的初步应力比较  

Stress Distribution Investigation of 4 Kinds of Fixed Prosthese Supported by Dental Implant in Edentulous Mandible

作　　者：游素兰[1] 黄远亮[1] 孙旻[2] 徐伟[2] 

机构地区：[1]同济大学附属东方医院口腔科,上海200120 [2]同济大学土木工程学院

出　　处：《中国口腔种植学杂志》2009年第2期69-70,共2页Chinese Journal of Oral Implantology

摘　　要：目的:比较同一病例3组下颌种植固定全口义齿的骨及种植体应力分布特点,为临床种植修复提供生物力学分析依据。方法:建立4个种植体3mm悬臂,6个种植体3mm悬臂,8个种植体3mm悬臂3组下颌种植固定全口义齿的三维有限元模型。在悬臂末端垂直加载100N。结果:种植全口义齿悬臂末端垂直加载时,各组种植体周围颈部骨应力集中。6个种植体组骨压应力和拉应力都最小。种植体应力主要集中在末端和中间种植体的颈部。种植修复上部支架应力主要集中在与远中末端种植体相连接处。结论:末端种植体骨应力集中,易发生松动失败;种植体颈部应力集中,易发生植入体与基桩连接失败。6个种植体支持组修复设计在该病例中较符合生物力学分布原理。Objective:To investigate the stress distribution within the 3 kinds distal cantilevered fixed prostheses supported by dental implants in edentulous mandible for the same patient.Methods:The three-dimensional finite element models of 3 kinds(4,6,8implants)3mm distal cantilevered fixed prostheses supported by dental implants in the same edentulous mandible was established.Vertical force of 100 N was applied to the distal cantilever of fixed prostheses.Results:The maximum bone stresses were at the terminal implant-bone interface.The maximum implant stresses were at the terminal and medium implant-prostheses interface.Distal cantilevered fixed prostheses supported by 6 implants have the least stress in the 3 kinds of distal cantilevered fixed prostheses.Conclusion:The bone around the terminal implant was easily to absorb and the terminal and medium implants were easily to fracture.Distal cantilevered fixed prostheses supported by 6 implants is the best design in the 3 kinds of distal cantilevered fixed prostheses for this patient.

关 键 词：固定修复 牙种植 应力 有限元方法 

分 类 号：R783.6[医药卫生—口腔医学]