Stress analysis in the mandibular condyle during prolonged clenching: a theoretical approach with the finite element method
Stress analysis in the mandibular condyle during prolonged clenching: a theoretical approach with the finite element method
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DOI：
10.1243/09544119jeim485
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发表时间：
2009-08-01
期刊：
影响因子：
1.8
通讯作者：
Tanaka, E.
中科院分区：
文献类型：
--
作者：
Nishio, C.;Tanimoto, K.;Tanaka, E.
功能异常的习惯，如磨牙症和长时间咬牙，已与颞下颌关节（TMJ）的功能过载，这可能会导致内部紊乱和骨关节病的TMJ。本研究应用TMJ数学模型，研究了长时间紧咬状态下髁突表面的应力分布。有限元模型的基础上开发的磁共振图像从两个主题或没有前盘位移的颞下颌关节。咀嚼肌的力量被用来作为一个负载条件的应力分析在10分钟的紧握。在无症状模型中，前区的应力值（0.100 MPa）和横向面积在10 min时，五个区域中的应力松弛值（0.074 MPa）相对较高。在中部和后部区域，应力松弛发生在前2 min。在症状模型中，10 min时外侧区的应力值显著低于其他区域（0.020 MPa），最大应力位于后部（0.050 MPa）。除前区显示在第一个2分钟的应力增加。目前的结果表明，位移的光盘可能会影响髁突关节面上的应力分布在长时间紧咬，特别是在后方地区，可能导致髁突关节面上的软骨破裂。
Parafunctional habits, such as bruxism and prolonged clenching, have been associated with functional overloading in the temporomandibular joint (TMJ), which may result in internal derangement and osteoarthrosis of the TMJ. In this study, the distributions of stress on the mandibular condylar surface during prolonged clenching were examined with TMJ mathematical models. Finite element models were developed on the basis of magnetic resonance images from two subjects with or without anterior disc displacement of the TMJ. Masticatory muscle forces were used as a loading condition for stress analysis during a 10 min clenching. In the asymptomatic model, the stress values in the anterior area (0.100 MPa) and lateral area (0.074 MPa) were relatively high among the five areas at 10 min. In the middle and posterior areas, stress relaxation occurred during the first 2 min. In contrast, the stress value in the lateral area was markedly lower (0.020 MPa) than in other areas in the symptomatic model at 10 min. The largest stress (0.050 MPa) was located in the posterior area. All except the anterior area revealed an increase in stress during the first 2 min. The present result indicates that the displacement of the disc could affect the stress distribution on the condylar articular surface during prolonged clenching, especially in the posterior area, probably leading to the cartilage breakdown on the condylar articular surface.