摘要： 目的：利用MRI-CT影像数据融合和多种建模软件协同应用，构建较为精确的颞下颌关节有限元模型。方法：采集正常颞下颌关节CT和MRI影像数据，导入Mimics软件，分别提取颞下颌关节窝、髁突和关节盘并构建三维模型。根据解剖关系对关节窝、髁突和关节盘进行装配。将装配的颞下颌关节三维模型导入SC/Tetra进行干涉面删除。然后导入Mimics和Hypermesh软件对下颌骨和关节窝进行四面体网格划分，对颞下颌关节盘进行六面体网格划分并局部优化，构建包含关节窝、髁突和关节盘的颞下颌关节有限元模型。建立的颞下颌关节有限元模型用Abaqus软件进行简单的验证。结果：基于CT和MRI影像数据构建出关节窝、髁突和关节盘三维模型。以此为基础，多种建模软件协同应用构建的有限元模型，充分保持了颞下颌关节各结构的解剖学特征，在计算时能很好的收敛。结论：利用CT和MRI影像数据融合和多种建模软件协同应用的方法，可以构建活体颞下颌关节有限元模型，并较为准确地保持关节窝、髁突和关节盘的解剖真实性，为准确模拟颞下颌关节生物力学特征提供基础。

关键词: CT;  , MRI;  , 颞下颌关节;  , 三维有限元模型

Abstract: Objective: To develop finite element (FE) model for the temporomandibular joint (TMJ), including temporomandibular joint fossa (TMJF), mandible condyle, and temporomandibular joint disc (TMJD).  Methods: The geometry of the TMJ from a healthy male volunteer, including the material properties of cancellous and cortical bone, were obtained from CT and MRI images. These data were used in MIMICS, an image-processing software, to form the geometry of TMJ before it could be introduced into SC/Tetra and Hypermesh software. Then the reconstructed models were assemble based on anatomic relation． Following the processes of intersecting surface deletion, mesh regeneration, optimization and tetrahedral mesh generation for TMJF and mandible condyle, whereas hexahedral mesh generation for TMJD, the TMJ finite element model，including different anatomical structures，was developed. The reconstructed finite element model was also imported into the Abaqus software to be tested. Results: The 3D mode of TMJ composed of TMJF，mandible condyle and TMJD was reconstructed from CT and MRI image data． Based on the 3D model，the TMJ finite element model was reconstructed by three reconstruction software retained the anatomical features of the included structures, and finite element model showed easy convergence. Conclusion: The method of CT-MRI image fusion combined with three reconstruction software is applicable to reconstruct the living subject TMJ finite element model，which retains the geometry of TMJ-related anatomical structures，and offers a useful tool for accurate modeling of the TMJ biomechanical behavior．

Key words:  CT, MRI, temporomandibular joint, finite element model

中图分类号: 

• R782.2