不同牙根形态对下颌第一磨牙即刻种植即刻负重影响的三维有限元分析

发布时间：2018-03-25 00:27

本文选题：磨牙　切入点：即刻种植　出处：《第三军医大学学报》2017年01期

【摘要】：目的基于三维有限元的方法,分析下颌第一磨牙即刻种植即刻负重时,不同牙根形态对种植体及其周围骨界面生物力学分布的影响。方法用两组牙根解剖形态不同的下颌第一磨牙建立下颌第一磨牙即刻种植即刻负重的三维有限元模型。两组牙齿分别为牙根分叉角度(interradicular angle,IA)不同组、根柱高度(root trunk height,RT)不同组。每个模型以100N的力分别轴向(冠根向)、斜向舌侧45°、舌颊向、近远中向加载,应用ANSYS软件分析种植体的位移及种植体骨界面的应力值。结果成功建立了下颌第一磨牙即刻种植即刻负重的三维有限元模型;有限元分析结果显示:随根分叉角度增大,根柱高度变短,各加载方向上种植体的最大位移、种植体骨界面的最大应力都呈下降趋势。种植体的最大位移中最大值在近远中向加载RT=5.3 mm时出现达0.461 mm,最小值出现在轴向加载IA=42°时,为0.008 mm。骨界面的应力集中于颈部皮质骨及螺纹接触部位较薄弱的松质骨上。骨界面的应力最大值在近远中向加载IA=10°时出现,最小值在轴向加载IA=18°时出现。结论不同牙根解剖形态对下颌第一磨牙即刻种植即刻负重种植体骨结合的形成有一定影响,使牙根间隔骨量减少的解剖因素增加了第一磨牙即刻种植即刻负重失败的风险。
[Abstract]:The purpose of the three-dimensional finite element method based on the analysis of the mandibular first molar implant after immediate loading, different root morphology of implant and surrounding bone interface biomechanical distribution. Methods two groups with different root anatomy of mandibular first molar to establish three-dimensional finite element model of the first molar immediate implant immediate loading of mandibular teeth respectively two groups. For the root of the bifurcation angle (interradicular angle, IA) of different groups, columns (root trunk height, height RT) of different groups. Each model in 100N respectively (axial crown direction), oblique tongue side 45 degrees, tongue in cheek to close to the loading, analysis of displacement and implant bone interface the stress value of the implant by ANSYS software. The results of three-dimensional finite element model of the mandibular first molar implant immediate immediate loading was successfully established; finite element analysis results show that the angle increases with the increase of root branching, column height shorter, The maximum displacement of the implant loading direction on the implant bone interface stress decreased. The maximum displacement of the implant in the maximum value near to RT=5.3 mm when loading up to 0.461 mm, the minimum value appeared in the axial load IA=42 degrees, 0.008 mm. bone interface stress concentration at the neck of cortical bone and thread contact parts of the weak cancellous bone interface stress. The maximum load to IA=10 degrees in the near and far, minimum axial loading IA=18 degrees. The conclusions have certain effect of different root anatomical shape of mandibular first molar immediate implant immediate loading implant bone the risk factors of root anatomical interval osteopenia increased first molar of immediate implant and immediate prosthesis failure.

【作者单位】：重庆医科大学附属口腔医院种植科口腔疾病与生物医学重庆市重点实验室重庆市高校市级口腔生物医学工程重点实验室;
【基金】：国家自然科学基金青年科学基金(11402042) 重庆市基础与前沿研究计划项目(CSTC2015jcyj A10027) 重庆市卫生计生委资助重点项目(20141012) 重庆市渝中区科委资助项目(20140128) 重庆高校创新团队建设计划资助项目(2016) 重庆市高校市级口腔生物医学工程重点实验室资助项目~~
【分类号】：R783.6

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