Development of an evaluating system for stomatognathic function based on biomechanical analysis

基于生物力学分析的口颌功能评估系统的研制

基本信息

批准号：
08457517
负责人：
WATANABE Makoto
金额：
$ 4.48万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08457517/
关键词：
Stomatognathic function Biomechanics 3-D finite element model Maxillofacial Morphology Jaw Muscle Activety 3-D bite force Condylar force 顎機能検査バイオメカニクス顎関節症顎筋筋電図咬合力咬合力分布

项目摘要

The aim of this research project was to develop an diagnostic system which evaluate the biomechanical condition of the temporomandibular joints using the three-dimensional finite element (3-D FE) model of each patient. Morphometric data of the mandibular bone, the lower dental arch were used to construct the 3-D FE model. Tensile force vectors of each muscles, which were estimated from the muscle form, muscle volulme and the electromyographic (EMG) activities during various types of tooth clenching, and bite force vectors on each occlusal contact area, which were simultaneously recorded with EMG,were input to the model. The bite force vectors were estimated from the magnitudes and the directions of the bite force. The former were recorded using pressure sensitive film, and the latter were measured using the newly developed device, which enables to measure a coordinate and a normal direction of each oculusal contact area in the dental cast using a laser displacement meter. This device showed to be reliable in measuring the normal direction of the occlusal contact area. The new device which enables to automatically detect the surface of the mandibular bone and the masticatory muscles from magnetic resonance (MR) images was also developed. The process of detecting the bone surface consisted of detecting the contour from serial images by active contour model and detecting the surface by active surface model. In this project, the surface of the cortical bone of the condyle was successfully detected from MR images. In this research project, all the methodological elements which were required to construct the diagnostic system were fully prepared.

该研究项目的目的是开发一个诊断系统，该系统使用每个患者的三维有限元（3-D FE）模型评估颞下颌关节的生物力学状况。下颌骨，下牙弓的形态计量数据用于构建3-D Fe模型。每种肌肉的拉伸力向量是根据肌肉形式，肌肉效应和肌电图（EMG）活性在各种类型的齿夹紧的过程中估计的，并且在每个咬合接触区域上的咬合力向量（与EMG同时记录）是对模型的输入的。从咬合力的大小和咬合方向估计咬合力载体。使用压力敏感膜记录了前者，并使用新开发的设备测量了后者，该设备能够测量使用激光位移仪的牙齿铸件中每个眼缘接触区域的坐标和正常方向。该设备显示在测量咬合接触区域的正常方向方面是可靠的。还可以开发出可自动检测下颌骨表面和磁共振（MR）图像的咀嚼肌表面的新设备。检测骨表面的过程包括通过主动轮廓模型从串行图像中检测轮廓，并通过主动表面模型检测表面。在这个项目中，从MR图像中成功检测到了con的皮质骨的表面。在该研究项目中，构建诊断系统所需的所有方法学因素均已完全准备。