不同牙 合 位时翼外肌对颞下颌关节盘的生物力学影响
殷学民，张琰，李子文，刘啸，宋梦阳，王方圆，刘小豪
中国临床解剖学杂志 ›› 2017, Vol. 35 ›› Issue (4) : 419-424.
不同牙 合 位时翼外肌对颞下颌关节盘的生物力学影响
Effect of the lateral pterygoid muscle on the anterior disc displacement with reduction of temporomandibular joint under different occlusal position
目的 研究在牙尖交错位和最大张口位时可复性关节盘前移位中翼外肌对关节盘的生物力学影响及两牙合 位之间的差异。 方法 对已经建立的可复性关节盘前移位的颞下颌关节数字化仿真模型，在不同牙合 位时进行翼外肌加载，通过三维有限元的方法进行生物力学分析。 结果 最大张口位时，关节盘应力集中区较牙尖交错位时向前外侧移动，集中于关节盘中间带偏外侧区；关节盘中间带与关节盘后带之间存在明显位移差，形成位移撕裂带，而在牙尖交错位时则无类似位移差现象。 结论 在可复性关节盘前移位中，最大张口位时翼外肌可导致关节盘中间带偏外侧区的应力集中，在关节盘中间带形成位移撕裂带，导致此区域变薄、穿孔甚至撕裂。
Objective To analyze the effect of lateral pterygoid muscle on anterior disc displacement with reduction of temporomandibular joint (TMJ) under different occlusal position. Methods Lateral pterygoid muscle was loaded under different occlusal position to simulate and biomechanically analyze the TMJ anterior disc displacement with reduction by using the established digital simulation model. Results Under the maximum jaw opening status, the disc region with the highest stress concentration occurred in the lateral part of the intermediate zone; the tendency of displacement appeared between the intermediate zone and the posterior band to form a tearing region. Under the intercuspal position, the disc region with the highest stress concentration occurred in the posteroir band and there was not a tearing region between the intermediate zone and the poster band. Conclusions The results indicate that the function of the lateral pterygoid muscles can lead to the stress concentration on intermediate zone of the articular disc under the maximum jaw opening status, resulting in a tearing region in the articular disc.
颞下颌关节盘 / 翼外肌 / 可复性关节盘前移位 / 生物力学
Temporomandibular joint disc / Lateral pterygoid muscle / Anterior discdisplacement with reduction / Biomechanics
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