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MORPHOLOGIC AND FUNCTIONAL ANALYSIS OF MASTICATOR MUSCLE BASED ON THE CARACTERISTICS OF CLEIDOCRANIAL DYSPLASIA

基于锁骨颅骨发育不良特征的咀嚼肌形态及功能分析

基本信息

批准号：
14571836
负责人：
FURUUCHI Toshi
金额：
$ 2.3万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14571836/
关键词：
masticatory muscle electromyogram cleidocranial dysplasia 骨癒合不全筋活動量

项目摘要

Purpose : The purpose of this research were to clarify the each masticator muscle function to the stomatognathic system, which were the effect of masticator muscle function to the mandiblar movement, the compasational change in masticator muscle function and the morphological characteristics associated to the hypofunction of the masseter muscle, with application of the characteristics of cleidocranial dysplasia (CCD).Methods : The morphologic characteristics in three patients with CCD were observed using panoramic radiographs and X-ray CT images. The electromyogram of masseter muscle and temporal muscle was obtained. The informed consents for this research were obtained from the patients.Results: The morphologic characteristics of CCD patients by panoramic radiograph and CT were (a)the zygomatic arch was discontinuous with the hypoplastic zygomatic bone, (b)the ascending ramus of the mandible had parallel-sided borders, (c)the coronoid process pointed upwards and/or posteriorly and (d)the masseter muscle were less thick than in age-and sex-matched control subjects. The functional characteristics of CCD patients' masticator muscle, obtained from the surface electromyography, were (e)the masseter muscle had low response and the temporal muscle indicated strong response with bilateral chewing.Discussion : The discontinuity of zygomatic arch of the CCD patients was thought to cause the unsteadiness or low resistance to the masticatory load, because the masseter muscle originates from the zygomatic arch. These situation was considered to result the small size and hypofunction of the masseter muscle, mutual hyperfunction of the temporal muscle and the remarkable electromyographic pattern in the patients with CCD. As compensation for the hypofunction of the masseter muscle, the other masticatory muscles may develop a hypermasticatory function.

目的：本研究旨在结合锁骨颅骨发育不良（CCD）的特点，阐明各咀嚼肌对口颌系统的功能，即咀嚼肌功能对下颌运动的影响、咀嚼肌功能的补偿性变化以及咬肌功能减退相关的形态学特征。方法：对3例患者的形态学特征进行分析。使用全景X线照片和X射线CT图像对CCD进行观察。获得咬肌和颞肌的肌电图。本研究已获得患者知情同意。结果：CCD患者的全景片和CT形态学特征为（a）颧弓与发育不全的颧骨不连续，（b）下颌骨升支边缘平行，（c）冠突向上和/或向后，（d）咬肌与年龄和性别匹配的对照受试者相比，其厚度更薄。从表面肌电图获得的CCD患者咀嚼肌的功能特征是（e）咬肌对双侧咀嚼反应低，颞肌反应强。讨论：CCD患者颧弓不连续被认为是导致咀嚼负荷不稳定或抵抗力低的原因，因为咬肌起源于颧弓。这些情况被认为是导致CCD患者咬肌体积小、功能减退、颞肌相互功能亢进以及肌电图异常的原因。作为对咬肌功能减退的补偿，其他咀嚼肌可能会产生过度咀嚼功能。