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http://dx.doi.org/10.5762/KAIS.2021.22.3.291

The Effect of The Forward Head Posture on The Maximum Mouth Opening of The Temporomandibular Joint, The Muscle Activity and The Asymmetry Rate of The Temporalis and Masseter  

Yang, Yong-Pil (Department of Physical Therapy, Dongshin University)
Seo, Dong-yel (Department of Physical Therapy, Dongshin University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.22, no.3, 2021 , pp. 291-296 More about this Journal
Abstract
This study examined the effects of the forward head posture on the maximum mouth opening of the jaw joint and the muscle activity and asymmetry of the temporalis and masseter. The craniovertebral angle was measured in 50 subjects (23.10±2.73 years) who met the selection requirements of the study. The maximum mouth opening, muscle activity, and muscle asymmetry were measured by reducing 0%, 10%, and 20%. As the craniovertebral angle decreased, the maximum mouth opening decreased (p<.001), the muscle activity of the right and left temporalis decreased (p<.001), and the muscle activity of the left temporalis also decreased. (p<.01). The asymmetry rate of the added muscles of the left and right temporalis, left and right temporalis, and masseter increased according to the change in condition (p<.01). The results of this study are expected to help establish a treatment strategy and comprehensive diagnosis for the temporomandibular joint and present a theoretical basis of manual therapy and therapeutic exercises used for the treatment of TMD.
Keywords
Forward Head Posture; Maximum Mouth Opening; Temporalis and Masseter; Muscle Activity; Muscle Asymmetry;
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