基于micro-CT成像的仿真牙周膜有限元建模探讨

摘要

Objective To establish the three-dimensional finite element simulation model of periodontal membrane by micro-CT scanning data. Methods A human maxillary jaw segment containing central incisor was scanned with micro-CT for section images, which were managed with Mimics software to form a geometric model. The model was imported to remesh module for optimization and then the three-dimentional finite element model was constructed by Ansys. Results The three-dimensional finite element models encompassing 12 936 nodes and 6 400 tetrahedral element, which highly re-semble the structure of periodontal ligament. Tooth ( 60 872 nodes and 42 144 tetrahedral element) and alveolar bone models ( 41 472 nodes and 32 339 tetrahedral element) were constructed successfully. Conclusion The three-dimen-sional finite element simulation model of periodontal membrane can be established by micro-CT combined with Mimics and Ansys software. After adding the corresponding tooth alveolar bone, it can be further used in orthodontic biomechanics analysis.%目的：应用micro-CT扫描数据建立仿真牙周膜三维有限元模型。方法对人上颌中切牙骨块标本进行micro-CT扫描,扫描数据通过Mimics软件进行三维重建及网格优化,再将模型以lis文件导入有限元分析软件Ansys,建立最终有限元模型。结果建立了包含12936个节点,6400个单元的人上颌中切牙仿真牙周膜三维有限元模型,模型形态与牙周膜实际形态高度相似。同时建立了包含60872个节点、42144个单元的牙齿模型及41472个节点、32339个单元的牙槽骨模型。结论结合micro-CT及Mimics、Ansys软件,能够建立仿真牙周膜三维有限元模型,添加对应的牙齿牙槽骨后,可进一步用于正畸生物力学分析。