减阻牵张成骨快速移动尖牙三维有限元模型的建立

Establishment of a three-dimensional finite element model of rapid canine movement through reducing resistance and distraction osteogenesis

背景:国内建立了减阻牵张成骨快速牙移动的实验动物模型,主要以基础研究为主,尚未见探讨减阻牵张成骨快速牙移动生物力学机制的文献。目的:基于CT法结合Mimics医学图像处理系统建立几何相似性和力学相似性较高的减阻牵张成骨术快速移动尖牙的三维有限元模型,为减阻牵张成骨术快速移动尖牙的生物力学分析、优化设计、和手术方法的选择建立灵活的分析平台。方法:通过64排螺旋CT对拔除第一前磨牙的成人上颌骨进行扫描,获得上颌骨、上颌牙列截面影像的DICOM数据。采用Mimics软件、GeomagicStudio8.0软件、UnigraphicsNX软件、Ansys11.0软件相结合的方法,建立包括上颌骨、上颌牙齿及牙周膜的减阻牵张成骨术快速移动尖牙的三维有限元模型。结果与结论:建立了由43477个单元,83577个节点组成的上颌减阻牵张成骨术快速移动尖牙的三维有限元模型,还可根据不同的研究目的和要求添加或删除组件。所建立的三维有限元模型能较真实模拟实际情况,具有较好的力学和几何学相似性,可用于进行减阻牵张成骨术中尖牙快速移动的生物力学研究,进而为临床操作提供理论依据。

BACKGROUND： Animal experimental model of the rapid tooth movement has been established through distraction osteogenesis domestically, based mainly on basic research. It has not been reported about the biomechanical mechanism of the rapid tooth movement through distraction osteogenesis. OBJECTIVE： To establish three-dimensional finite element model （3-D FEM） with high geometric and mechanical similarity of rapid canine movement through reducing resistance and distraction osteogenesis, and to set up a flexible platform for analyzing the biomechanics of rapid canine movement through reducing resistance and distraction osteogenesis, optimization design and selecting the method for surgery. METHODS： By the scanning of spiral CT with 64 rows, the sectional image data in DICOM of maxillary and upper teeth were obtained. With the help of Mimics, Geomagic Studio 8.0, Unigraphics NX and Ansys 11.0 software, the 3-D FEM of rapid canine movement was established through reducing resistance and distraction osteogenesis, including maxillary, upper teeth and periodontal ligament. RESULTS AND CONCLUSION： A 3-D FEM of rapid canine movement through reducing resistance and distraction osteogenesis was established, which consisted of 43 477 elements and 83 577 nodes, which could add or delete the framework according to different research needs. The 3-D FEM with high geometric and mechanical similarity provided a favorable platform for analyzing the biomechanics behavior of rapid canine movement through reducing resistance and distraction osteogenesis, which provide theory bases for clinical application generally.