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The Study of Craniomandibular Disorder Using MRI, Three-Dimensional Bite Force and EMG.

使用 MRI、三维咬合力和肌电图研究颅下颌疾病。

基本信息

批准号：
01480444
负责人：
WATAMABE Makoto
金额：
$ 4.16万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01480444/
关键词：
Three-dimensional bite force Masficatory muscle EMG Craniomandibular disorder Motor unit Facial morpholody 咬筋

项目摘要

Detailcd study normal function of stomatognathic system is needcd to investigate the nature of craniomandibular disorder (CMD) because it is the dysfunction found in masticatoty muscles and temporomandibular joint (TMJ). Morphological parameters such as orientation and attachment of muscles affect the activities of muscles and internal stress of TMJ. Then it is much important to analyze the function of masticatory muscles with refercnce to facial morphology.At first, to find the coordination pattern of masticatory muscles, surface electromyograms (EMGs) of masseter and temporal muscles were recoded and analyzed when normal subjects were asked to clench on condition that their bite force were regulated three-dimensionally. As s result, when bite force changed anteriorly, posteriorly and laterally, the activities of two muscles changed in reverse manners each other. Namely it became apparent that these muscles showed reciprocal activation pattern in the changes of bite force direction.Co … More ntinuously different functions of each part of masseler muscle were investigated since it had complex layering structure histochemically heterogeneous muscle fibers. The study based on simultaneous recording of three-dimensional bite force and motor units made clear that each motor unit had a specific optimal directional range for its firing and each part of masseter muscle played a different role for its function. It was suggested that this reflected the layering structure of masseter muscle because the difference of function was more markedly between anterior and posterior parts than between internal and external and external parts.In addition, a morphological analysis using lateral rentogenographic cephalograms were performed to investigate the relationships between the coordination pattern of masticatory muscles and facial morphology. Though the coordination patter of masseter and lemporal museles were almost same among subjects, activities of each were seemed to be affected by some morphological factors such as an inclination of mandibular plane.The present study revealed the coordination pattern of masseter and temporal muscles and the role of each part of masseter muscle but the relations of facial morphology to them were not sufficiently explained. Biomechanical analyses of stomatognathic system are necessary for studying the CMD, and it is evident that morphological and functional investigations are important. Less

颅颌关节紊乱(CMD)是咀嚼肌和颞下颌关节(TMJ)的功能障碍，需要详细研究口腔颌面系统的正常功能，以探讨CMD的本质。肌肉的取向和附着等形态参数影响肌肉的活动和TMJ的内应力。首先，在三维调节咬合力的条件下，记录和分析正常受试者咬合力时咬肌和颞肌的表面肌电信号，以找出咀嚼肌的协调模式。S的研究结果表明，当咬合力向前、向后和向外变化时，两块肌肉的活动变化是相反的。也就是说，这些肌肉在咬合力方向的变化中表现出相互激活的模式。Co…由于咀嚼肌具有复杂的层次化结构和组织化学异质性，因此对其各部分的功能差异进行了更连续的研究。这项基于三维咬合力和运动单位同步记录的研究表明，每个运动单位都有一个特定的最佳发射方向范围，咬肌的每一部分在其功能中扮演着不同的角色。这反映了咬肌的层次化结构，因为前后两部分的功能差异比内外两部分的功能差异更明显。此外，通过头颅侧位X线片的形态分析，探讨了咀嚼肌的协调模式与面部形态的关系。虽然不同受试者的咬肌和颞肌的协调模式基本相同，但它们的活动似乎都受到一些形态因素的影响，如下颌平面的倾斜。本研究揭示了咬肌和颞肌的协调模式以及咬肌各部分的作用，但没有充分解释面部形态与它们之间的关系。口腔颌面系统的生物力学分析对于研究CMD是必要的，显然，形态和功能的研究是重要的。较少