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MORPHOLOGICAL AND FUNCTIONAL ANALYSIS OF MASTICATOR MUSCLE WITH APPLICATION OF THE PATIENTS WITH CLEIDOCRANIAL DYSPLASIA

咀嚼肌的形态和功能分析及其在锁骨颅骨发育不良患者中的应用

基本信息

批准号：
12671872
负责人：
FURUUCHI Toshi
金额：
$ 1.98万
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：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12671872/
关键词：
CLEIDOCRANIAL DYSPLASIA MASTICATOR MUSCLE SIZE OF MUSCLE ELECTROMYOGRAM 節電図

项目摘要

Purpose : The purpose in this research were to clarify the each masticator muscle function to the stomatognathic system, which were the effect of masseter muscle function to the mandibular movement, the compensational changes in masticator muscle function and the morphological characteristics associated to the hypofunction of the masseter muscle, with application of the patients with cleidocranial dysplasia (CCD).Method : The morphological 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 patients' consents were obtained for this research.Results : In the patients with CCD, the zygomatic bone was hypoplastic and the zygomatic arch was discontinuous. The ascending ramus of the mandible had pararell-sided borders. The shape of the coronoid process was slender and pointing upwards and posteriorly. The thickest values of the masseter muscle of CCD patients were smaller than that of the control subjects and were not included in the range of mean±2SD. In the patients with CCD, the surface electromyogram of 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 caused the unsteadiness of the masseter muscle and had not enough resistance to the load produced by the muscle contraction. These situation was considered to result the small size and hypofunction of the masseter muscle, mutual hyperfunction of the temporal muscle and the characteristic electromyogram pattern in the patients with CCD. The hyperfunction of the temporal muscle was considered to cause the abnormal shape of the mandibular bone.

目的：本研究以锁骨颅骨发育不良（CCD）患者为对象，明确咬肌功能对下颌运动的影响、咀嚼肌功能的代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CCD患者的形态学特征进行研究。 observed using panoramic radiographs and X-ray CT images.获得咬肌和颞肌的肌电图。本研究已获得患者同意。结果：CCD患者颧骨发育不全，颧弓不连续。下颌骨升支具有平行边边界。冠突的形状细长且指向上方和后方。 CCD患者咬肌最厚值小于对照组，且不包含在平均值±2SD范围内。 CCD患者咬肌表面肌电图反应低，双侧咀嚼时颞肌反应强。讨论：CCD患者颧弓不连续，导致咬肌不稳定，对肌肉收缩产生的负荷抵抗力不足。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特征性肌电图模式的原因。颞肌功能亢进被认为是导致下颌骨形状异常的原因。