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ID 50683
FullText URL
Author
Maeda, Naoto
Sakamoto, Shunichi
Maeda, Teruta
Minagi, Shogo
Abstract
The activity of the lateral pterygoid muscle has been regarded to be related to the pathological condition of the temporomandibular joint (TMJ) in the craniomandibular disorders. Because the lateral pterygoid muscle is a deep muscle, a needle electrode is necessary for EMG recordings. The purpose of this study was to establish a non-invasive method for the evaluation of muscle activity of the lateral pterygoid muscle using mechanomyogram (MMG). In three male subjects, surface electromyogram (EMG) in the left masseter muscle, left anterior and posterior belly of the temporal muscle, left anterior belly of the digastric muscle and needle EMG of the inferior head of the lateral pterygoid were recorded during mandibular movement tasks simultaneously with the MMG derived from a condenser microphone in the external ear canal. There were significant positive correlations between the needle EMG signal of the lateral pterygoid muscle and the MMG signal for the tasks of static jaw opened position of 30 mm of interincisal distance (p = 0.000, R(2)=0.725), static jaw opened position of 40 mm of interincisal distance (p = 0.000, R(2) = 0.753), 5 mm protruded mandibular position (p = 0.000, R(2) = 0.653), the most protruded mandibular position (p = 0.000, R(2) = 0803). On the contrary, for the task of maximal clenching, there was no significant correlation between the EMG signal of the lateral pterygoid muscle and the MMG signal. These results suggest that the activity of the lateral pterygoid muscle could be evaluated by the MMG signals recorded in the external ear canal, unless jaw closing major muscles show active contraction.
Keywords
Mechanomyogram
Electromyogram
Lateral pterygoid muscle
Jaw movement
Published Date
2012-01-15
Publication Title
Journal of Neuroscience Methods
Volume
volume203
Issue
issue1
Publisher
Elsevier Science BV
Start Page
157
End Page
162
ISSN
0165-0270
Content Type
Journal Article
Official Url
http://dx.doi.org/10.1016/j.jneumeth.2011.09.026
Related Url
http://ousar.lib.okayama-u.ac.jp/metadata/50724
language
英語
Copyright Holders
(C) 2011 Elsevier B.V. All rights reserved.
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author
Refereed
True
DOI
Web of Sience KeyUT