Effect of the lateral pterygoid muscle on the anterior disc displacement with reduction of temporomandibular joint under different occlusal position
YIN Xue-min, ZHANG Yan, LI Zi-wen, LIU Xiao, SONG Meng-yang, WANG Fang-yuan, LIU Xiao-hao
Chinese Journal of Clinical Anatomy ›› 2017, Vol. 35 ›› Issue (4) : 419-424.
Effect of the lateral pterygoid muscle on the anterior disc displacement with reduction of temporomandibular joint under different occlusal position
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.
Temporomandibular joint disc / Lateral pterygoid muscle / Anterior discdisplacement with reduction / Biomechanics
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