微种植体舌侧内收上前牙力系三维有限元非线性模型的建立  

Construction of nonlinear 3-D finite element model for maxillary anterior teeth lingual retraction force system with micro-implant anchorage

作　　者：姜琴[1,2] 邓锋[1,2] 王超[1,2] 张向凤[1,2] 张翼[1,2] 

机构地区：[1]重庆医科大学附属口腔医院正畸科,重庆400015 [2]口腔疾病与生物医学重庆市重点实验室,重庆401147

出　　处：《第三军医大学学报》2015年第16期1652-1656,共5页Journal of Third Military Medical University

基　　金：国家自然科学基金面上项目(11402042);重庆市卫生局一般项目(2013-2-069)~~

摘　　要：目的建立具有高度几何相似性和力学相似性的微种植体支抗舌侧内收上颌前牙力系的三维有限元非线性模型。方法通过高精度的螺旋CT扫描获得组牙与颌骨的结构信息,运用MIMICS软件进行三维重建,在Solidworks软件中建立包含舌侧托槽、弓丝、牵引钩及微种植体的三维几何模型。将上述三维几何模型导入ANSYS软件,并生成非线性牙周膜及非均质性颌骨,最终生成微种植体支抗舌侧内收上颌前牙力系的三维有限元非线性模型,并对模型进行加载检测。结果成功建立了高仿真的微种植体舌侧内收上颌前牙力系的三维有限元非线性模型。在100×g内收载荷作用下,上颌前牙发生舌向倾斜的初始位移,同时上颌切牙的腭侧龈缘与颊侧根尖出现压应力集中区,而腭侧根尖与颊侧龈缘出现牵张应力区。结论根据上颌骨正交各向异性以及牙周膜非线性的材料属性,建立了具有高度几何相似性和力学相似性的微种植体舌侧内收上颌前牙力系的三维有限元非线性模型,可用于该舌侧矫治力系的生物力学分析。Objective To construct a nonlinear three-dimensional （3-D） finite element model with highly geometric similarity and mechanical similarity for maxillary anterior teeth lingual retraction force system with micro-implant anchorage. Methods The 3-D geometrical model of maxillary bone and teeth was constructed based on the data from spiral CT scanning with high resolution by using MIMICS software, and the model of lingual appliance and micro-implant were constructed in the Solidworks CAD software. The parameters of periodontal membranes were set as nonlinear and the maxilla bone as non-homogeneous and anisotropy. ANSYS software was used to mesh the model and construct the nonlinear 3-D finite element model of maxillary anterior teeth lingual retraction force system with micro-implant anchorage. Results The nonlinear 3-D finite element model of maxillary anterior teeth lingual retraction force system with micro-implant anchorage was constructed with good similarity in geometrics and mechanics. Under the load of 100 g retraction force, retroclination initial displacements of maxillary anterior teeth were observed. Pressure stress concentration zone was located in the lingual marginal and buccal apical area, while stretching stress concentration zone was located in the buccal marginal and lingual apical area. Conclusion The nonlinear 3-D finite element model of maxillary anterior teeth lingual retraction force system is demonstrated to be an ideal biomechanical tool in the study on such complicated lingual orthodontic force system

关 键 词：非线性 三维有限元 舌侧内收力系 微种植体支抗 

分 类 号：R318.01[医药卫生—生物医学工程] R319[医药卫生—基础医学]