Condylar translation and the function of the superficial masseter muscle in the rhesus monkey (M. mulatta).
Condylar translation and the function of the superficial masseter muscle in the rhesus monkey (M. mulatta).
复制标题
恒河猴（M. mulatta）髁平移和浅表咬肌功能。
DOI：
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发表时间：
1977
影响因子：
2.8
通讯作者：
D. Carlson
中科院分区：
文献类型：
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作者：
D. Carlson
根据相对扭矩和肌肉的长度-张力关系，检查对称下颌旋转期间下颌髁突的平移（即对称下颌凹陷和抬高）与浅咬肌功能之间的关系。使用两种模型分析活体成年恒河猴（Macaca mulatta）的侧位头影片：（1）模型A，正常对称下颌旋转伴随髁突平移； (2)模型B，在中心咬合期间，下颌围绕固定在髁突位置的轴旋转。模型 B 中相对扭矩的减少和浅表咬肌在张嘴位置的偏移明显大于模型 A。颌绕固定轴的对称旋转将导致最大张开时最大可产生张力的损失比与髁突平移相关的旋转大 35%。这些结果表明，下颌凹陷和抬高过程中髁突的平移可最大限度地减少相对扭矩的减少和浅表咬肌的偏移，从而在颌闭合过程中保持施加最大张力的最佳潜力。
The relationship between translation of the mandibular condyle during symmetrical mandibular rotation, i.e., symmetrical jaw depression and elevation, and the function of the superficial masseter muscle was examined in light of relative torque and the length-tension relationship for muscle. Lateral cephalograms of live adult rhesus monkeys (Macaca mulatta) were analyzed using two models: (1) Model A, normal symmetrical jaw rotation accompanied by condylar translation; and (2) Model B, mandibular rotation about an axis fixed at the position of the condyles during centric occlusion. The decrease in relative torque and the excursion of the superficial masseter at mouth-open positions are significantly greater in Model B than in Model A. Symmetrical rotation of the jaw about a fixed axis would result in a 35% greater loss of maximum producible tension at maximum gape than rotation associated with condylar translation. These results suggest that condylar translation during mandibular depression and elevation functions to minimize reduction in relative torque and excursion of superficial masseter muscle, thereby maintaining optimal potential for exerting maximum tension during jaw closure.