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种诊断系统，利用每位患者的三维有限元 (3-D FE) 模型评估颞下颌关节的生物力学状况。下颌骨、下牙弓的形态测量数据用于构建 3-D 有限元模型。输入根据各种类型的咬牙过程中的肌肉形状、肌肉体积和肌电图（EMG）活动估计的每块肌肉的拉力矢量，以及与肌电图同时记录的每个咬合接触区域的咬合力矢量到模型。根据咬合力的大小和方向来估计咬合力矢量。前者使用压敏胶片记录，后者使用新开发的设备测量，该设备能够使用激光位移计测量牙模中每个眼部接触区域的坐标和法线方向。该装置在测量咬合接触区域的法线方向方面被证明是可靠的。还开发了一种能够从磁共振（MR）图像中自动检测下颌骨表面和咀嚼肌的新设备。骨表面检测过程包括利用主动轮廓模型从序列图像中检测轮廓和利用主动表面模型检测表面。在该项目中，成功地从 MR 图像中检测到髁突皮质骨表面。在这个研究项目中，构建诊断系统所需的所有方法要素都已准备就绪。