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首页> 外文期刊>Journal of Biomechanics >Analysis of human mandibular mechanics based on screw theory and in vivo data
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Analysis of human mandibular mechanics based on screw theory and in vivo data

机译：基于螺丝理论和体内数据的人体下颌力学分析

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In this paper the mechanics of human mandibular function is described in terms of the associated screws. The two distinct, yet related features of jaw mechanics, involving the motion itself as well as the forces, are both functions of the anatomical constraints, namely the contact areas that exist within the temporomandibular joint, and the forces of the muscles and tendons that allow motion to occur. The relationships that exist between these two aspects of jaw-motion are identified in this paper showing that muscle forces can be uniquely represented in terms of the action screw. This new approach to analyzing the mechanics of jaw-motion also incorporates the previously studied motion screw or helical axis. A consistent dynamic model is formulated where the action screw is used to represent the action of the closing muscle forces while the moment arms of the muscle forces are determined about the motion screw representing mandibular kinematics. The action screw formulation is verified using in vivo motion data and MR image information for a single asymptomatic subject. The results confirm the feasibility of the method and its application in dental research. A general increase in the mechanical advantage of most muscles, in the distance between action and motion screws as well as in the expended energy towards the end of the jaw-closing phase was observed. Asymmetries in the distribution of muscle force magnitudes appeared to influence the resultant force and moment of the action screw but had little effect on its spatial location. The method presented is intended to facilitate understanding of mandibular function and dysfunction. (C) 2004 Elsevier Ltd. All rights reserved.
机译：在本文中，根据相关的螺钉描述了人体下颌功能的力学。颌骨力学的两个不同但又相关的特征，包括运动本身和力，都是解剖学约束的功能，即颞下颌关节内存在的接触区域，以及允许的肌肉和肌腱力。运动发生。本文确定了颚运动的两个方面之间的关系，表明肌肉力可以根据动作螺钉来唯一表示。这种分析颚运动机理的新方法还结合了先前研究的运动螺钉或螺旋轴。建立了一致的动力学模型，其中用动作螺钉表示闭合的肌肉力的作用，同时确定围绕代表下颌运动学的运动螺钉的肌肉力的力矩臂。使用单个无症状受试者的体内运动数据和MR图像信息验证了动作螺钉的配方。结果证实了该方法的可行性及其在牙科研究中的应用。观察到大多数肌肉的机械优势，动作螺钉和运动螺钉之间的距离以及下颌闭合阶段即将结束时所消耗的能量普遍增加。肌肉力量大小分布的不对称性似乎影响了作用螺钉的合力和力矩，但对其空间位置影响很小。提出的方法旨在促进对下颌功能和功能障碍的理解。 （C）2004 Elsevier Ltd.保留所有权利。

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