咀嚼系统包括全牙列精细结构的数字解剖学建模研究

Digital Anatomy on of Masticatory System Including Full Teeth Structure

摘要: 目的：探讨建立包括上下颌骨双皮质层、牙髓、牙本质、牙骨质、牙釉质、牙周膜及颅颌面咬合三维解剖学模型的可行性，为后期导入Ansys软件定义各组织的材料属性建立系统的三维有限元模型做准备，以及为研究颅颌面、颞下颌关节及牙齿的生物力学特性提供建模思路。方法：采集第二代中国虚拟人男性第23号头颅CT图像、咀嚼肌MRI图像及双侧颞下颌关节盘MRI图像，以DICOM格式导入Mimics软件进行三维重建，再通过Geomagic-Stadio软件配准模型、优化模型及构建咀嚼系统包含牙体牙周精细模型。结果：建立了一个包含上颌骨双皮质层、下颌骨双皮质层，全牙列以及颞下颌关节骨骼肌肉系统和颅颌面的三维解剖学模型。结论：基于CT、MRI影像和解剖学，利用医学影像处理软件Mimics、Geomagic-Stadio可以精确、可行地构建包含全牙列精细结构和颞下颌关节骨骼肌肉咬合系统及颌面部的三维解剖学模型。该模型更加真实的还原了颌面部咬合系统的生物力学环境，为咬合系统骨骼肌肉协调功能的生物力学研究提供了新的建模方法和思路。

Abstract: Objective: To discuss feasibility of constructing masticatory system including full teeth structure, temporomandibular joint and craniomaxillofacial structure based on imaging and anatomy. To prepare for defining the material properties on constructing the 3-D FEM of masticatory system by means of Ansys and to provide new ideas of modeling for research on biomechanics of the crani-omaxillofacial structure. Methods: CT machine and MRI machine were used to scan the skull, mas-ticatory muscles and bilateral temporomandibular joint in the second generation No. 23 of Chinese virtual human. CT and MRI image data in format of DICOM were in batches imported into Mimics to reconstruct 3-D model, then integrating and optimizing the models, constructing model of the masticatory system including full teeth structure by geomagic stadio. Results: A 3-D model of the masticatory system including full teeth structure, enamel, cementum, dentin, dental pulp, periodontal ligament, mandibular, maxillary, temporomandibular joint, craniomaxillofacial struc-ture is constructed. Conclusions: It is precise and feasible to construct a 3-D model of the mastica-tory system including full teeth structure based on CT images, MRI images and anatomy by means of Mimics and Geomagic Stadio. This model can restore the biomechanics environment of the mas-ticatory system, and provide new ideas of modeling for research on biomechanics of the masticatory system.