Chinese Journal Of Clinical Anatomy ›› 2017, Vol. 35 ›› Issue (4): 419-424.doi: 10.13418/j.issn.1001-165x.2017.04.013

Previous Articles     Next Articles

Effect of the lateral pterygoid muscle on the anterior disc displacement with reduction of temporomandibular joint under different occlusal position

YIN Xue-min1, ZHANG Yan1, LI Zi-wen2, LIU Xiao3, SONG Meng-yang1, WANG Fang-yuan1, LIU Xiao-hao1   

  1. 1. Department of Oral and Maxillofacial Surgery,NanfangHospital, Southern Medical University, Guangzhou 510515, China;  2. Department of Oral and Maxillofacial Surgery,Xiamen oral hospital, Xiamen 361000, China;  3. Renji Hospital of Shanghai Jiao Tong University School of Medicine, Shanghai 200127,  China
  • Received:2017-03-06 Online:2017-07-25 Published:2017-08-30

Abstract:

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.

Key words: Temporomandibular joint disc,  Lateral pterygoid muscle,  Anterior discdisplacement with reduction,  Biomechanics