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Development of the model to calculate the mechanical stress which applied to the region of TMJ during functional jaw movement

开发模型来计算功能性下颌运动期间施加到 TMJ 区域的机械应力

基本信息

批准号：
12671999
负责人：
MIYAWAKI Shouichi
金额：
$ 2.24万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

Mandibular movement with 6 degrees of freedom and jaw-closing and opening muscles were taken during mastication, open-close jaw movement and voluntary clenching in 10 normal subjects, 10 patients with temporomandibular joint (TMJ) internal derangement, and 10 patients with unilateral posterior crossbite, Morphological image data were also taken in all subjects. The real time scale was transformed to normalized time. CT of head including TMJ were taken in one of above subjects. 3-D finite element model was made in a computer by using CT images and medical fast imaging finite element model making program. Using this model and morphological image data in each subject, respective finite element model was made. It was assumed that CT values on the image were proportional to the bone mineral density and the elastic moduluses of each bone were proportional to the cube root of the bone mineral density. The mechanical parameters were maximum principal and von Mises stresses on the condylar, mandibular fossa, articular disc and mandible. The forces of aforementioned muscles were derived from the equation of equilibrium of moment. The model to calculate the mechanical stress to TMJ was made by using aforementioned data and model. We revealed for the first time that the displacement of the condyle on the chewing side was greater in the direction of the mandibular fossa than that on the non-chewing side, that disc displacement inhibited the condylar motion during mastication and open-close jaw movement, and that the condyle on the posterior crossbite side moved more in the direction of the mandibular fossa, during mastication. In all subjects, almost same results were calculated by using aforementioned model. Therefore, we confirmed that our model to calculate the mechanical stress to TMJ was valid.

采集10例正常受试者、10例颞下颌关节（TMJ）内错乱患者、10例单侧后牙反牙合患者在咀嚼、开合颌运动和自愿咬牙过程中的下颌6自由度运动和开颌肌运动，并采集所有受试者的形态学图像数据。将实时时间尺度转换为标准化时间。上述受试者之一接受了包括颞下颌关节在内的头部 CT 扫描。利用CT图像和医学快速成像有限元模型制作程序在计算机中制作3D有限元模型。利用该模型和每个受试者的形态学图像数据，制作各自的有限元模型。假设图像上的 CT 值与骨矿物质密度成正比，每个骨骼的弹性模量与骨矿物质密度的立方根成正比。机械参数是髁突、下颌窝、关节盘和下颌骨上的最大主应力和冯米塞斯应力。上述肌肉的力是从力矩平衡方程导出的。利用上述数据和模型建立了计算颞下颌关节机械应力的模型。我们首次揭示了咀嚼侧髁突向下颌窝方向的位移大于非咀嚼侧髁突的位移，椎间盘位移抑制了咀嚼过程中髁突的运动和开闭颌运动，而后反牙合侧髁突在咀嚼过程中向下颌窝方向移动更多。在所有受试者中，使用上述模型计算出几乎相同的结果。因此，我们确认我们计算 TMJ 机械应力的模型是有效的。