Three-dimensional finite-element model of the human temporomandibular joint disc during prolonged clenching
Three-dimensional finite-element model of the human temporomandibular joint disc during prolonged clenching
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DOI：
10.1111/j.1600-0722.2006.00389.x
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发表时间：
2006-10-01
影响因子：
1.9
通讯作者：
Tanne, Kazuo
中科院分区：
文献类型：
--
作者：
Hirose, Miho;Tanaka, Eiji;Tanne, Kazuo
在颞下颌关节（TMJ）中，由长时间握紧引起的超载似乎是导致椎间盘移位的一系列重要事件。在本研究中，椎间盘移位对关节应力在长时间握紧的影响进行了研究。为此，采用有和无椎间盘移位的TMJ有限元模型。在10分钟的时间内，肌肉力作为加载条件进行应力分析。TMJ椎间盘和结缔组织的特征是线性粘弹性材料。在无症状模型中，通过握紧在椎间盘中央和外侧发现较大的应力。在紧绷的前2分钟，椎间盘后组织出现应力松弛。在症状模型中，椎间盘后部和椎间盘后组织均可见较大应力，通过握紧使应力水平保持恒定。这说明在长时间握紧时，无症状关节的椎间盘功能良好，而有症状关节的椎间盘后组织受到过大的应力。由于这种结构不太适合承受大的应力，可能会发生组织损伤。此外，储存过多的应变能可能导致组织断裂。
In the temporomandibular joint (TMJ), overloading induced by prolonged clenching appears to be important in the cascade of events leading to disc displacement. In this study, the effect of disc displacement on joint stresses during prolonged clenching was studied. For this purpose, finite-element models of the TMJ, with and without disc displacement, were used. Muscle forces were used as a loading condition for stress analysis during a time-period of 10 min. The TMJ disc and connective tissue were characterized as a linear viscoelastic material. In the asymptomatic model, large stresses were found in the central and lateral part of the disc through clenching. In the retrodiscal tissue, stress relaxation occurred during the first 2 min of clenching. In the symptomatic model, large stresses were observed in the posterior part of the disc and in the retrodiscal tissue, and the stress level was kept constant through clenching. This indicates that during prolonged clenching the disc functions well in the asymptomatic joint, meanwhile the retrodiscal tissue in the symptomatic joint is subject to excessive stress. As this structure is less suitable for bearing large stresses, tissue damage may occur. In addition, storage of excessive strain energy might lead to breakage of the tissue.