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Fatigue analysis in the masseters and temporalis muscles in patients with temporomandibular disorder during short period of mastication.

Authors
  • Caria, Paulo H F1
  • Bigaton, Delaine R
  • de Oliveira, Anamaria S
  • Bérzin, Fausto
  • 1 Piracicaba Dental School, State University of Campinas, São Paulo, Brazil. [email protected] , (Brazil)
Type
Published Article
Journal
Acta odontologica latinoamericana : AOL
Publication Date
Jan 01, 2009
Volume
22
Issue
2
Pages
87–91
Identifiers
PMID: 19839483
Source
Medline
License
Unknown

Abstract

The purpose of this experiment was to look for signals of muscle fatigue in volunteers with Temporomandibular Disorders (TMD) during short period of mastication. Twenty female volunteers selected by Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) participated, 10 with myogenic TMD (experimental) and 10 clinically normal (control). The Masseter and Temporalis muscles were evaluated electromyographically with active differential surface electrodes. The masticatory activity was recorded for 15 seconds and the signals were normalized by 4 seconds of teeth clenching. Three complete masticatory cycles were taken to calculating the median frequency (MF) and electromyographic amplitude (RMS). The data were submitted to statistics analysis and non-parametric tests. The results showed that RMS and median frequency did not change during the mastication period analyzed, indicating the absence of muscle fatigue, for the Masseter and Temporalis muscles in both groups (p> 0.05). These results confirm the absence of signals of muscle fatigue in masticatory muscles during short period of mastication even in individuals with TMD, possibly due to increased of blood flow, consequence of dynamic muscle contraction and the individual characteristics of muscle fiber composition and recruitment.

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