【作者】 顾卫平；

【导师】 殷新民；

【作者基本信息】 南京医科大学 ， 口腔临床医学， 2005， 硕士

【摘要】 颞下颌关节(temporomalldibular joint,TMJ)的生长发育和功能改建与颞下颌关节的生物力学环境密切相关,其生物力学一直是(牙合)学研究的热点,由于直接测量颞下颌关节的受力存在一定的困难,理论分析法在颞下颌关节的生物力学研究中被广泛采用,有限元法(finite element method,FEM)是其中运用最多的方法之一,以往的研究多采用CT、MRI和片切法来进行TMJ的有限元建模,其片切或扫描层厚一般为1～3mm左右,这些方法很难同时清楚地显示关节盘、咀嚼肌、牙齿和颌骨等软硬组织,对于颞下颌关节这一复杂精细的关节而言显得过于粗糙,因此给建立完整准确的颞下颌关节的生物力学模型带来很大困维。本研究利用中国可视化人体(Chinese Visible Human,CVH)超薄切片图像建立包括各种软硬组织在内的完整的颞下颌关节三维有限元模型,用于颞下颌关节的生物力学研究。 实验一、颞下颌关节三维实体模型的建立 材料和方法:在CVH超薄切片图像基础上,运用逆向工程(Reverse Engineering,RE)技术,在Imageware中进行关节盘、关节窝、髁状突,下颌骨的骨松质、骨皮质、牙齿、咀嚼肌的轮廓提取、配准、参数化调整,再导入UG中通过穿越曲线构建实体的功能进行三维实体造型。 结果:在UG中成功建立了再现同一个体TMJ软硬组织的三维实体模更多还原

【Abstract】 The development and reconstruction of temporomandibular joint(TMJ) are closely related to its biomechanical environment ,the biomechanical study of TMJ has been a hot issue in occlusion for many years. The indirect theoretical analysis has played an important role due to many difficulties in direct method to investigate the loading of TMJ. Among these indirect methods, finite element method(FEM) is most widely used .In previous studies, the FEM model was built up on the basis of CT,MRI or traditional slices, it’s too imprecise for the fabricated TMJ due to the thickness of them varied from 1mm to 3mm and couldn’t display the soft and hard tissues clearly at the same time. The aim of this study was to develop a precise FEM model of TMJ on the basis of images of Chinese Visible Human(CVH) by means of Reverse Engineering(RE) technology.Part I The reconstruction of 3-D solid model of TMJ Materials and Methods: The contours of TMJ, including cortical, cancellous bone, teeth, masticatory muscles, articular cartilage and periodontal ligament were obtained from the images of CVH by means of RE technology,After being registered and reparameterized ,the B-splineswere imported into UG software to construct the 3-D solid model.Results: A more precise 3-D solid model of TMJ was constructed,themodel can be observed from any views and can simulate many kinds ofdentition defects and crowding via layer control,rotation and Booleanoperation.Conclusion: On the basis of images of CVH, a complex 3-D solid modelof TMJ can be constructed more precisely by means of RE technology.Part II The construction of 3-D FEM model of TMJ Materials and methods: The 3-D solid model of TMJ ,teeth and periodontal ligament was exproted as IGES formatted files and imported into TrueGrid software to mesh with hex solid element.Afterwards,the model was imported into Patran software to mesh the surface of mandibular with triangle element, After being meshed entirely ,the model was imported into Marc to incorporate each other into one uniform FEM model. The cross-section areas and force directions of masticatory muscles were obtained from the 3-D solid Model.Results: The 3-D FEM model of TMJ including cortical, cancellous bone, mandibular dental arch, masticatory muscles, articular cartilage and periodontal ligament was constructed ,which consisted of 66122 nodes and 212704 elements.Conclusion: The FEM model was constructed more efficiently and the geometry similarity was improved after the precise Computer Aided更多还原