微型种植体长度对骨界面应力分布的影响  

The effect of mini-implant lengths on stress distributions in peri-implant surface

作　　者：单丽华[1] 董福生[2] 宫伟伟[3] 张雄[3] 

机构地区：[1]河北医科大学第二医院口腔正畸科,石家庄050000 [2]河北医科大学口腔医院颌面外科,石家庄050017 [3]清华大学工程力学系,北京100084

出　　处：《华西口腔医学杂志》2011年第1期27-30,共4页West China Journal of Stomatology

基　　金：河北省科技支撑计划基金资助项目(08276101D-4)

摘　　要：目的探讨微型种植体长度对骨组织内应力分布的影响。方法建立直径1.6 mm,长度分别为6、8、10、12 mm的种植体-下颌骨三维有限元模型,垂直植入种植体,给以1.96 N的水平向前及前上方向的载荷,记录并分析不同情况下的应力分布。结果种植体水平向前载荷的应力峰值范围为3.500～3.765 MPa,位移峰值范围为1.266～1.288μm;前上方向载荷的应力峰值范围为4.075～4.510 MPa,位移峰值范围为1.668～1.694μm。水平向前载荷的应力峰值及位移峰值均低于前上方向载荷的峰值。结论在所研究的尺寸(6～12 mm)范围内,种植体长度对骨界面应力影响不大,而种植体载荷方式对骨界面应力分布有重要影响。Objective To observe the effect of mini-implant lengths on stress distribution in peri-implant surface.Methods The 3D finite element analysis mandible and mini-implant models with diameter of 1.6 mm,lengths of 6,8,10 and 12 mm were established.The mini-implants were inserted into designed site of mandibular vertically,respectivly.A force of 1.96 N were applied mesioly and 45° tilted mesio-vertically in models.The stress distribution under every condition was recorded and analyzed.Results When load was applied mesially,the maximum stress varied from 3.500 to 3.765 MPa,the maximum displacement varied from 1.266 to 1.288 μm.When load was applied 45°tilted mesio-vertically,the maximum stress varied from 4.075 to 4.510 MPa,the maximum displacement varied from 1.668 to 1.694 μm.All of the maximum stress and displacement of loading mesially were lower than loading mesio-vertically.Conclusion The change of the mini-implant length within 6-12 mm don＇t show much influence on the stress distribution.The loading type is an important factor influencing stress and displacement of peri-implant bone.

关 键 词：微型种植体 应力分布 三维有限元分析 

分 类 号：R783.5[医药卫生—口腔医学]