Combined finite-element and rigid-body analysis of human jaw joint dynamics
Combined finite-element and rigid-body analysis of human jaw joint dynamics
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DOI：
10.1016/j.jbiomech.2004.10.014
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发表时间：
2005-12-01
影响因子：
2.4
通讯作者：
van Eijden, TMGJ
中科院分区：
文献类型：
--
作者：
Koolstra, JH;van Eijden, TMGJ
下颌关节在人体咀嚼过程中起着至关重要的作用。它是下颌运动的指南，也是力量产生的支点。关节承受的载荷会导致其软骨结构的拉伸和变形。这些被认为是关节发展、维护和退化的主要决定因素。建立了人体咀嚼系统的动力学模型，分析了颌骨运动过程中关节软骨结构中张力和变形的分布规律。它的运动由肌肉激活控制。建立了关节软骨层和关节盘的有限元模型。由于刚体和有限元模型的结合还没有应用于肌肉骨骼系统，因此通过模拟卸载和加载的颌骨运动来评估其优点和局限性。结果表明，关节载荷随着肌肉的激活而增加，与外部载荷无关。随着关节载荷的增加，关节面应力区范围增大，而峰值应力受影响较小。结果表明，关节盘通过将主压应力转换为剪应力，使局部接触应力在非常不协调的关节表面的更大范围内分布。(C)2004爱思唯尔有限公司。保留所有权利。
The jaw joint plays a crucial role in human mastication. It acts as a guidance for jaw movements and as a fulcrum for force generation. The joint is subjected to loading which causes tensions and deformations in its cartilaginous structures. These are assumed to be a major determinant for development, maintenance and also degeneration of the joint. To analyze the distribution of tensions and deformations in the cartilaginous structures of the jaw joint during jaw movement, a dynamical model of the human masticatory system has been constructed. Its movements are controlled by muscle activation. The articular cartilage layers and articular disc were included as finite-element (FE) models. As this combination of rigid-body and FE modeling had not been applied to musculoskeletal systems yet, its benefits and limitations were assessed by simulating both unloaded and loaded jaw movements. It was demonstrated that joint loads increase with muscle activation, irrespective of the external loads. With increasing joint load, the size of the stressed area of the articular surfaces was enlarged, whereas the peak stresses were much less affected. The results suggest that the articular disc enables distribution of local contact stresses over a much wider area of the very incongruent articular surfaces by transforming compressive principal stress into shear stress. (c) 2004 Elsevier Ltd. All rights reserved.