Mandibular biomechanics and temporomandibular joint function in primates.
Mandibular biomechanics and temporomandibular joint function in primates.
复制标题
灵长类动物的下颌生物力学和颞下颌关节功能。
DOI：
10.1002/ajpa.1330490307
复制
发表时间：
1978
影响因子：
2.8
通讯作者：
R. Smith
中科院分区：
文献类型：
--
作者：
R. Smith
关于咀嚼过程中下颌髁突是否承受压力或无压力存在分歧。为了支持替代模型，我们与 III 级杠杆、连杆和耦合系统进行了类比。生理数据表明，当上颌和下颌牙齿接触时会产生最大咀嚼力，并且该阶段在许多咀嚼动作中持续超过 100 毫秒。在此期间，下颌骨可以建模为具有多个支撑的梁。简单梁理论方程表明，咀嚼过程中存在较大的髁突反作用力。人类单侧磨牙咬合时，髁突总反作用力可能超过咬合力的 75%。正面投影分析表明，在单侧磨牙咬合过程中，高达 80% 的髁突总反作用力由对侧（平衡侧）髁突承受。 A comparison of human, chimpanzee (P. troglodytes), spider monkey (A. belzebuth), and macaque (Macaca sp.) morphology indicates that the frugivorous chimpanzee and spider monkey have a relatively lower condylar reaction force than the omnivorous macaque or man during molar biting.人类切咬时的反作用力百分比低于其他灵长类动物，食果灵长类动物也低于猕猴。
There is disagreement as to whether the mandibular condyles are stress-bearing or stress-free during mastication. In support of alternative models, analogies have been drawn with Class III levers, links, and couple systems. Physiological data are reviewed which indicate that maximum masticatory forces are generated when maxillary and mandibular teeth are in contact, and that this phase lasts for over 100 msec during many chewing strokes. During this period, the mandible can be modeled as a beam with multiple supports. Equations of simple beam theory suggest that large condylar reaction forces are present during mastication. With unilateral molar biting in man, the total condylar reaction force may be over 75% of the bite force. Analysis of a frontal projection demonstrates that up to 80% of the total condylar reaction force is borne by the contralateral (balancing side) condyle during unilateral molar biting. A comparison of human, chimpanzee (P. troglodytes), spider monkey (A. belzebuth), and macaque (Macaca sp.) morphology indicates that the frugivorous chimpanzee and spider monkey have a relatively lower condylar reaction force than the omnivorous macaque or man during molar biting. The percentage reaction force during incisal biting is lower in man than in the other primates, and lower in the frugivorous primates than in the macaque.