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The Attachment of the Masseter Muscle Influences of the Craniofacial Morphology and Bite Force Distribution

咬肌附着对颅面形态及咬合力分布的影响

基本信息

批准号：
06672069
负责人：
KAZUTAKA Kasai
金额：
$ 1.34万
依托单位：
Nihon University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06672069/
关键词：
Masseter muscle Craniofacial morphology Bite force

项目摘要

This research is divided into three sections as follows ;1. The relationship between masseter muscle and craniofacial morphologyThis section describes the attachment, the area and orientation of the superficial masseter muscle and its relationship with craniofacial morphology in dentate and edentulous subjects. A principal component analysis provided evidence that the lower masseter muscle width was associated with the size of ramus and was related to the position of the anterior margin of the muscle. The result of a linear discriminant function suggested that the ramus width, coronoid height and the distance between the anterior margin of masseter muscle and the mandibular notch contributed most to the observed difference between dentate and edentulous subjects. The results of this study indicated that a reduction of masticatory function was associated with the position of the anterior border of the insertion of the masseter muscle and also with differences in ramus dimension, the mos … More t significant of which were differences in the coronoid process and gonial angle.2. The relationship between bite force and craniofacial morphologyThe purposes of this section were to understand their specific jaw apparatus by comparing the dental arch morphology, craniofacial morphology and bite force and also to estimate the relationship between craniofacial morphology and bite in Fijians and Japanese. The measurements were taken on dental casts, cephalograms and dental prescale (bite force analysis ; occlusal area, average occlusal force and bite force). In every direction, the size of the dental arch in Fijians was larger than Japanese. And also Fijians had the large palatal length, mandibular length and mandibular body length and showed the bimaxillary protrusion. The inclination of the lower incisor in Fijians was more lingual than Japanese. There were significant differences in the lever armlength between Fijians and Japanese.3. The morpnhological characteristics of vertical sections of mandibles by CT scanningThe aims of this section were to compare the internal morphologies of vertical sections of the mandibular body and to evaluate the relationship between these morphologies and the gonial angle. As the result of the principal component analysis, each value of the sections was grouped into the same factor, except for the buccal cortical bone thickness. Especially the symphysis buccal cortical bone was opposite to the premolar buccal cortical bone. The gonial angle was associated with the buccal and lingual cortical bone thickness of the second molar section, and related to the height of the symphysis and the second molar section. These results confirmed the relationship between the gonial angle and the size of the mandibular body at the second molar region. This region was located near the ramus which had the attachment of masticatory muscles. Less

本研究分为以下三个部分：1。咬肌与颅面形态的关系本节描述有齿和无齿受试者的浅咬肌的附着、面积和方向及其与颅面形态的关系。主成分分析表明，下咬肌宽度与支的大小有关，并与肌前缘的位置有关。线性判别函数的结果表明，支宽、冠状高度和咬肌前缘到下颌切迹的距离对有牙和无牙受试者的差异贡献最大。本研究结果表明，咀嚼功能的降低与咬肌止点前缘的位置和支径的差异有关，其中最显著的是冠突和角的差异。咬合力与颅面形态的关系本节的目的是通过比较斐济人和日本人的牙弓形态、颅面形态和咬合力来了解他们特定的颌器，并估计颅面形态与咬合力的关系。测量牙模、头颅造影和牙预测片（咬合力分析、咬合面积、平均咬合力和咬合力）。在各个方向上，斐济人的牙弓都比日本人大。斐济人的腭长、下颌骨长和下颌骨体长都很大，并有双颌前突。斐济人的下门牙比日本人更倾向于舌。斐济人和日本人的杠杆臂长有显著差异。下颌骨垂直切面的CT扫描形态学特征本切片的目的是比较下颌骨垂直切面的内部形态学，并评价这些形态学与骨角的关系。主成分分析结果表明，除颊皮质骨厚度外，各切片值均归为同一因子。尤其是颊皮质骨联合与前磨牙颊皮质骨相对。角与第二磨牙段颊部和舌部皮质骨厚度有关，与联合和第二磨牙段高度有关。这些结果证实了下颌第二磨牙区角与下颌骨体的大小之间的关系。该区域位于有咀嚼肌附着的支附近。少