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2022 Jan-Mar; Vol 13, No 1:e4 |
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Effect of Starting Posture on Three-Dimensional Jaw and Head Movement J Oral Maxillofac Res 2022;13(1):e4 doi:10.5037/jomr.2022.13104 Abstract | HTML | PDF | XML |
Effect of Starting Posture on Three-Dimensional Jaw and Head Movement
1Physical Therapy Program, Midwestern University, 555 31st Street, Downers Grove, IL 60515, USA.
2Kevin T. Crofton Department of Aerospace Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA.
3Shriners Hospital for Children®-Chicago, 2211 N Oak Park Ave, Chicago, IL, 60707, USA.
4College of Dental Medicine, Midwestern University, 555 31st Street, Downers Grove, IL 60515, USA.
5Department of Physical Therapy, Virginia Commonwealth University, 900 E Leigh Street, Richmond, VA 23298, USA.
Corresponding Author:
Physical Therapy Program and College of Dental Medicine
Midwestern University
555 31st Street, Downers Grove, IL 60515
USA
Phone: 1-630-515-6451
Fax: 1-630-515-7224
E-mail: jprodo@midwestern.edu
ABSTRACT
Objectives: The effect of body posture on movement of the jaw and head has not yet been clearly established. The relationship between jaw and head movement has implications for conditions such as temporomandibular joint disorders which can be associated with neck pain. The purpose of this quasi-experimental study was to examine the effect of starting posture on three-dimensional movement of the jaw and head, and to examine the relationship between head and jaw movement during mouth opening.
Material and Methods: Fourteen healthy participants performed jaw opening to comfortable and maximal amounts from three starting body postures (neutral, slumped, upright) while three-dimensional movement of the head, jaw, and trunk was tracked. Separate repeated measures analyses of variance analyses examined the effect of posture on jaw and head rotation and translation, and Pearson product moment correlations examined the relationship between jaw opening and head rotation.
Results: Body posture significantly influenced maximal opening but not comfortable opening (P < 0.0033). There was a positive relationship between head extension and maximum opening in an upright posture (r = 0.74, P = 0.006), and head extension and comfortable opening in neutral and upright postures (r = 0.75 to 0.93, P < 0.0033), although there was no relationship between head extension and jaw opening in a slumped posture when opening comfortably.
Conclusions: Posture can affect three-dimensional movement of the jaw when opening. Negating the normal head extension that occurs with mouth opening when in a slumped posture has implications for the development of temporomandibular and neck problems in some individuals.
J Oral Maxillofac Res 2022;13(1):e4
doi: 10.5037/jomr.2022.13104
Accepted for publication: 22 March 2022
Keywords: mandible; movement; kinematics; neck; temporomandibular joint; posture.
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To cite this article: Effect of Starting Posture on Three-Dimensional Jaw and Head Movement J Oral Maxillofac Res 2022;13(1):e4 URL: http://www.ejomr.org/JOMR/archives/2022/1/e4/v13n1e4ht.htm |
Received: 24 December 2021 | Accepted: 22 March 2022 | Published: 31 March 2022
Copyright: © The Author(s). Published by JOMR under CC BY-NC-ND 3.0 licence, 2022.