In vivo Cross-sectional Area of Human Jaw Muscles Varies with Section Location and Jaw Position

Muscle cross-sectional area (CSA) is used as a measure for maximum muscle force. This CSA is commonly determined at one location within the muscle and for one jaw position. The purpose of this study was to establish a method to standardize the analysis of the CSA of the masticatory muscles in vivo,...

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Bibliographic Details
Published in:Journal of dental research 2005-06, Vol.84 (6), p.570-575
Main Authors: Goto, T.K., Yahagi, M., Nakamura, Y., Tokumori, K., Langenbach, G.E.J., Yoshiura, K.
Format: Article
Language:English
Subjects:
Adult
Anatomy, Cross-Sectional
Cephalometry - methods
Dental Occlusion
Dentistry
Female
Humans
Image Processing, Computer-Assisted - methods
Magnetic Resonance Imaging
Male
Mandible - anatomy & histology
Masseter Muscle - anatomy & histology
Masticatory Muscles - anatomy & histology
Pterygoid Muscles - anatomy & histology
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Summary:Muscle cross-sectional area (CSA) is used as a measure for maximum muscle force. This CSA is commonly determined at one location within the muscle and for one jaw position. The purpose of this study was to establish a method to standardize the analysis of the CSA of the masticatory muscles in vivo, and to compare the CSAs along their entire length for two different jaw positions (opened and closed). The CSAs in the planes perpendicular to the long axes of the masseter, medial, and lateral pterygoid muscles were measured in ten normal young adult subjects by magnetic resonance imaging. Our results showed large differences among the muscles and a non-uniform change in CSA after jaw-opening. The method enables the CSA measurement to be standardized in vivo, and allows for a correct comparison of CSAs in different skull morphologies.
ISSN:0022-0345
1544-0591
DOI:10.1177/154405910508400616