关闭拔牙间隙阶段个体化舌侧矫治器三维有限元模型的建立

Construction of a 3-D finite element model for the customized lingual appliance used in space closure

目的建立关闭拔牙间隙阶段牙列-牙周膜-上颌骨-个体化舌侧矫治器的整体三维有限元模型，为进一步探讨舌侧矫治过程中生物力学机制奠定基础。方法采用螺旋CT扫描，分别应用Mimics10．01软件、Geomagic Studio 9软件、ANSYS10．0软件，建立牙列-牙周膜-上颌骨-个体化舌侧矫治器的整体三维有限元模型。结果建成的个体化舌侧矫治器的三维模型包含38个实体模型与个体化舌侧矫治器实际情况相近，网格划分后．共包含节点471208个，单元279744个。结论利用CT扫描技术与计算机辅助设计技术及三维有限元方法的结合，建立关闭拔牙间隙阶段个体化舌侧矫治器的整体三维有限元模型较真实的模拟了临床实际情况。为进一步研究个体化舌侧矫治技术关闭拔牙间隙阶段的牙齿移动生物力学机制提供有效平台。

Objective To construct a 3-D finite element model with dentition, PDL, maxilla and customized lingual appliance used in space closure, and further biomechanic research for lingual orthodontics can be based on this model. Methods After CT scaning, Mimics 10. 01, Geomagic Studiao 9 and ANSYS 10. 0 were employed to develop a 3-D finhe element model with dentition, PDL, maxilla and customized lingual appliance. Results 38 volume models were involved in the constructed 3-D modle, and the model had a good similarity to the clinic, The total number of the nodes was 471, 208 , and the muber of the elements was 29774. Conclusion The 3-D finite element model for the customized ligual appliance constructed by CT scanning and Computer Aided Design technology in combination with finite element analysis is feasible to resembling the clinical situation, and can be a platform for the further research of biomechanic for the lingual orthodontcis.