Koolstra J H, van Eijden T M
Department of Functional Anatomy, Academic Center for Dentistry-ACTA, Amsterdam, The Netherlands.
J Biomech. 1992 Feb;25(2):175-87. doi: 10.1016/0021-9290(92)90274-5.
A previously described three-dimensional mathematical model of the human masticatory system, predicting maximum possible bite forces in all directions and the recruitment patterns of the masticatory muscles necessary to generate these forces, was validated in in vivo experiments. The morphological input parameters to the model for individual subjects were collected using MRI scanning of the jaw system. Experimental measurements included recording of maximum voluntary bite force (magnitude and direction) and surface EMG from the temporalis and masseter muscles. For bite forces with an angle of 0, 10 and 20 degrees relative to the normal to the occlusal plane the predicted maximum possible bite forces were between 0.9 and 1.2 times the measured ones and the average ratio of measured to predicted maximum bite force was close to unity. The average measured and predicted muscle recruitment patterns showed no striking differences. Nevertheless, some systematic differences, dependent on the bite force direction, were found between the predicted and the measured maximum possible bite forces. In a second series of simulations the influence of the direction of the joint reaction forces on these errors was studied. The results suggest that they were caused primarily by an improper determination of the joint force directions.
一个先前描述的人类咀嚼系统三维数学模型，可预测各个方向上的最大可能咬合力以及产生这些力所需的咀嚼肌募集模式，该模型在体内实验中得到了验证。使用颌骨系统的MRI扫描收集个体受试者模型的形态学输入参数。实验测量包括记录最大自主咬合力（大小和方向）以及颞肌和咬肌的表面肌电图。对于相对于咬合平面法线成0度、10度和20度角的咬合力，预测的最大可能咬合力是测量值的0.9至1.2倍，测量的最大咬合力与预测值的平均比值接近1。测量和预测的平均肌肉募集模式没有显著差异。然而，在预测的和测量的最大可能咬合力之间发现了一些取决于咬合力方向的系统差异。在第二系列模拟中，研究了关节反作用力方向对这些误差的影响。结果表明，这些误差主要是由关节力方向的不当确定引起的。
