Three-dimensional temporomandibular joint muscle attachment morphometry and its impacts on musculoskeletal modeling

Journal of Biomechanics
Xin SheHai Yao

Abstract

In musculoskeletal models of the human temporomandibular joint (TMJ), muscles are typically represented by force vectors that connect approximate muscle origin and insertion centroids (centroid-to-centroid force vectors). This simplification assumes equivalent moment arms and muscle lengths for all fibers within a muscle even with complex geometry and may result in inaccurate estimations of muscle force and joint loading. The objectives of this study were to quantify the three-dimensional (3D) human TMJ muscle attachment morphometry and examine its impact on TMJ mechanics. 3D muscle attachment surfaces of temporalis, masseter, lateral pterygoid, and medial pterygoid muscles of human cadaveric heads were generated by co-registering measured attachment boundaries with underlying skull models created from cone-beam computerized tomography (CBCT) images. A bounding box technique was used to quantify 3D muscle attachment size, shape, location, and orientation. Musculoskeletal models of the mandible were then developed and validated to assess the impact of 3D muscle attachment morphometry on joint loading during jaw maximal open-close. The 3D morphometry revealed that muscle lengths and moment arms of temporalis and masseter muscles ...Continue Reading

Citations

Dec 17, 2019·The Journal of Craniofacial Surgery·Kenneth K C IpLouis M Ferreira
Dec 1, 2020·Journal of Biomechanics·Minako OnimaruKoutaro Maki
Nov 19, 2020·Clinical and Experimental Dental Research·Sasin SritaraKeiichi Akita
Apr 8, 2021·International Journal of Oral and Maxillofacial Surgery·Y Q ZhongC Lu

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