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目的:利用螺旋CT技术与三维有限元方法,建立统一坐标系下上颌埋伏尖牙及其支持组织的三维有限元模型,为正畸牵引治疗埋伏尖牙的研究提供数字模型。方法:从正畸患者中选取一埋伏牙病例为实验样本,利用螺旋CT设备,Mimics、Unigraphic(UG)等软件,建立埋伏牙及其支持组织的三维实体(CAD)模型,并将建立的3种CAD模型导入MSC.Mentat软件中进行网格划分,建立可用于力学分析的三维有限元模型。结果:利用螺旋CT设备,Mimics、Unigraphic(UG)等软件,建立了上颌埋伏尖牙及其支持组织(牙周膜和上颌骨整体)的三维实体(CAD)模型,所建模型具有较高的几何相似性。结论:利用螺旋CT扫描技术、Mimics、UG、MSC等工程软件建立的上颌埋伏尖牙三维有限元模型精确度高,结构完整,网格质量好,可以满足对埋伏牙进行各种模拟牵引加载的需求。
OBJECTIVE: To establish a three-dimensional finite element model of the maxillary impacted canine and its supporting tissues in a single coordinate system by using spiral CT and three-dimensional finite element method, and to provide a digital model for the study of orthodontic traction in treating the canine impacted canines. Methods: A sample of impacted teeth from orthodontic patients was selected as experimental sample. The CAD models of implanted teeth and their supporting tissues were established by using spiral CT equipment, Mimics and Unigraphic (UG) software. The 3 The CAD model is imported into the MSC.Mentat software for meshing and a three-dimensional finite element model can be established for mechanical analysis. Results: The CAD model of the maxillary impacted canine and its supporting tissues (periodontal ligament and maxillary whole body) was established by using spiral CT equipment, Mimics, Unigraphic (UG) and other softwares. The model has high Geometric similarity. CONCLUSION: The three-dimensional finite element model of maxillary impacted canines established by the software of Mimics, UG, MSC and so on is of high precision, complete structure and good mesh quality. It can meet various simulated traction loads of the impacted teeth demand.