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Endplate Potential Oscillation of Jaw Closing Muscles in Natural Chewing | OMICS International | Abstract
ISSN: 2376-032X

JBR Journal of Interdisciplinary Medicine and Dental Science
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Research Article

Endplate Potential Oscillation of Jaw Closing Muscles in Natural Chewing

Toshifumi Kumai*

Oral Science, Matsumoto Dental University, Japan

*Corresponding Author:
Toshifumi Kumai
Oral Science, Matsumoto Dental University, Japan
Tel: 81-0263-51-225
E-mail: [email protected]

Received date: March 22, 2014; Accepted date: June 30, 2014; Published date: July 07, 2014

Citation: Kumai T (2014) Endplate Potential Oscillation of Jaw Closing Muscles in Natural Chewing. J Interdiscipl Med Dent Sci 2:129. doi: 10.4172/2376-032X.1000129

Copyright: © 2014 Kumai T. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Surface electromyograms (EMGs) in natural gum chewing were recorded in a monopolar manner from paired anterior temporalis and masseter muscles of four subjects. Electrodes were placed on the temple of the former muscle, and on the inferior portion of the latter muscle. The endplate potential (EPP) component was extracted from raw EMGs of the muscles using a digital filter: the frequency of the high-cut digital filter for eliminating action potentials was set to 12.5 Hz or 45 Hz. The EPP component of the EMG burst of each stroke in the natural chewing showed two phases, early negative slow wave and following oscillation, which was same as observed in the clenching task. From FFT analysis, the frequencies of the ipsilateral EPP oscillations were around 30 Hz for both the temporalis and masseter muscles, which was also the same for the clenching task. It is concluded that the contraction of the jaw closing muscles is regulated in an oscillating manner of the EPP even in natural chewing behaviors. This oscillation phenomenon of the EPP gives a useful hint about the mechanism of muscular movements including chewing.

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