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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Muscle activation time during chewing in temporomandibular disorder patients

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Author(s):
Mariana Barcellos Machado [1] ; Gabriel Silva Nitsch [2] ; Natássia Côndilo Pitta [3] ; Anamaria Siriani de Oliveira [4]
Total Authors: 4
Affiliation:
[1] Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto. Departamento de Biomecânica, Medicina e Reabilitação do Aparelho Locomotor
[2] Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto. Departamento de Biomecânica, Medicina e Reabilitação do Aparelho Locomotor
[3] Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto. Departamento de Biomecânica, Medicina e Reabilitação do Aparelho Locomotor
[4] Universidade de São Paulo. Faculdade de Medicina de Ribeirão Preto. Departamento de Biomecânica, Medicina e Reabilitação do Aparelho Locomotor
Total Affiliations: 4
Document type: Journal article
Source: Audiol., Commun. Res.; v. 19, n. 2, p. 202-207, 2014-04-00.
Abstract

Purpose This study aimed to compare the time of masseter and anterior temporal muscle activations, in different ranges of surface electromyographic amplitude, between controls and individuals with temporomandibular disorders (TMDs) during mastication. Methods Twenty-two female patients, aged 18-48 years, were divided into the TMD group (n=14; TMD type Ia, according to the Research Diagnostic Criteria for Temporomandibular Disorders) and the control group (n=8; non-diagnosed and asymptomatic individuals). Time and surface electromyography (SEMG) amplitudes from the anterior temporal and masseter muscles were registered during bilateral chewing of Parafilm M® for 10 s. SEMG amplitudes were categorized as 0-39%, 40-74%, and 75-100% of the mean of three maximal clenchings. The percentages of total activation times (duty factor) in each range of SEMG amplitudes were compared between groups using an unpaired Student’s t-test. Results: There were no differences in duty factor comparisons between groups. Conclusion: The activation time of the masticatory muscles was not found to be shorter in the TMD patients than in the controls. Finally, the application of the electromyographic variable proposed in this study may not be considered useful to diagnose type Ia TMD in clinical practice. However, its application may be complementary to the history and physical examination of these patients. (AU)

FAPESP's process: 12/00420-7 - The use of the duty factor in the comparative analysis of the activation of the masseter and anterior temporal muscles of people with TMD during habitual mastication
Grantee:Mariana Barcellos Machado
Support Opportunities: Scholarships in Brazil - Scientific Initiation