Meyer C, Kahn J L, Boutemy P, Wilk A
Department of Maxillofacial Surgery, University Hospital of Strasbourg, France.
J Craniomaxillofac Surg. 1998 Oct;26(5):331-41. doi: 10.1016/s1010-5182(98)80064-4.
The purpose of this study is to determine the external forces that are brought to bear on the mandible during 14 masticatory tasks, exerted in three defined mandibular positions. A static two-dimensional mandibular model is presented, taking into account projections in the sagittal plane of the forces exerted by six muscle groups and the joint reaction force. In calculating these external forces, two working hypotheses are adopted: the existence of a linear relationship between cross-sectional surface of the muscle and its maximum force of contraction, and the existence of a linear relationship between the electrical signal emitted by a muscle and the force the muscle then develops. Our first results are provided and compared with data from the literature. Individual variations recorded in the measurement of the different parameters involved in the equilibrium equations are such that they must be taken into account in the calculation of the forces. Moreover, the functional value of the muscles appears to be closely dependent on the mandibular position with which they are associated, which is not brought out in earlier studies. Finally, intra-joint action proves to be intense, although its direction varies according to the mandibular position and the type of exercise performed.
本研究的目的是确定在三个特定下颌位置进行14项咀嚼任务时作用于下颌骨的外力。提出了一个静态二维下颌模型，该模型考虑了六个肌肉群施加的力以及关节反作用力在矢状面的投影。在计算这些外力时，采用了两个工作假设：肌肉横截面积与其最大收缩力之间存在线性关系，以及肌肉发出的电信号与肌肉随后产生的力之间存在线性关系。给出了我们的初步结果并与文献数据进行了比较。平衡方程中涉及的不同参数测量中记录的个体差异使得在计算力时必须予以考虑。此外，肌肉的功能值似乎与其相关的下颌位置密切相关，这在早期研究中并未体现出来。最后，关节内的作用力被证明是强烈的，尽管其方向根据下颌位置和所进行的运动类型而变化。
