Dynamic mechanics in the pig mandibular symphysis
Dynamic mechanics in the pig mandibular symphysis
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DOI：
10.1111/j.1469-7580.2006.00584.x
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发表时间：
2006-07-01
影响因子：
2.4
通讯作者：
Hannam, A. G.
中科院分区：
文献类型：
--
作者：
Langenbach, G. E. J.;Zhang, F.;Hannam, A. G.
在咀嚼过程中，各种生物力学事件发生在哺乳动物颌联合。以前，这些事件已经在静态环境中进行了研究，或通过直接记录表面骨应变。然而，到目前为止，还不能直接证明通过联合的力和扭矩与动态变化的肌肉张力的关系。因此，我们修改了以前发表的动态猪颌骨模型，以预测在联合的力量和扭矩，并与这些模拟咀嚼肌紧张，咬合，关节和食物团的力量。一个人工刚性关节建模的联合，允许测量的三轴力和扭矩通过it.The模型成功地证实了三个先前假设的加载模式在联合。当下牙撞击人工食物团时，发生背腹剪切。这与平衡侧颌内收肌的力量和工作侧咬合点的反作用力有关。内侧横向弯曲发生在下颌打开，并与两侧的紧张局势在外侧翼。横向弯曲（wishbone）发生在动力冲程的后期，并与深，浅咬肌的行动。最大的预测力是背腹侧剪切力，最大的扭矩是关于上下轴的“wishboning”扭矩。我们认为，动态建模提供了一个新的和强大的方法来研究颌骨生物力学，特别是当所涉及的参数是难以或不可能在体内测量。
During mastication, various biomechanical events occur at the mammalian jaw symphysis. Previously, these events have been studied in the static environment, or by direct recording of surface bone strains. Thus far, however, it has not been possible to demonstrate directly the forces and torques passing through the symphysis in association with dynamically changing muscle tensions. Therefore, we modified a previously published dynamic pig jaw model to predict the forces and torques at the symphysis, and related these to simulated masticatory muscle tensions, and bite, joint and food bolus forces. An artificial rigid joint was modelled at the symphysis, allowing measurements of the tri-axial forces and torques passing through it. The model successfully confirmed three previously postulated loading patterns at the symphysis. Dorsoventral shear occurred when the lower teeth hit the artificial food bolus. It was associated with balancing-side jaw adductor forces, and reaction forces from the working-side bite point. Medial transverse bending occurred during jaw opening, and was associated with bilateral tensions in the lateral pterygoid. Lateral transverse bending (wishboning) occurred at the late stage of the power stroke, and was associated with the actions of the deep and superficial masseters. The largest predicted force was dorsoventral shear force, and the largest torque was a 'wishboning' torque about the superoinferior axis. We suggest that dynamic modelling offers a new and powerful method for studying jaw biomechanics, especially when the parameters involved are difficult or impossible to measure in vivo.