Electromyographic indices, orofacial myofunctional status and temporomandibular disorders severity: A correlation study

Abstract This study examined whether there is an association between surface electromyography (EMG) of masticatory muscles, orofacial myofunction status and temporomandibular disorder (TMD) severity scores. Forty-two women with TMD (mean 30 years, SD 8) and 18 healthy women (mean 26 years, SD 6) wer...

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Bibliographic Details
Published in:Journal of electromyography and kinesiology 2012-04, Vol.22 (2), p.266-272
Main Authors: De Felício, Cláudia Maria, Ferreira, Cláudia Lúcia Pimenta, Medeiros, Ana Paula Magalhães, Rodrigues Da Silva, Marco Antonio M, Tartaglia, Gianluca M, Sforza, Chiarella
Format: Article
Language:English
Subjects:
Adult
Case-Control Studies
Deglutition - physiology
Electromyography
Face - physiopathology
Female
Humans
Masseter Muscle - physiopathology
Mastication - physiology
Masticatory muscles
Muscle Contraction - physiology
Orofacial myofunctional evaluation
Physical Medicine and Rehabilitation
Reproducibility of Results
Severity of Illness Index
Surveys and Questionnaires
Temporal Muscle - physiopathology
Temporomandibular disorders
Temporomandibular Joint Disorders - physiopathology
Tongue - physiopathology
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Summary:Abstract This study examined whether there is an association between surface electromyography (EMG) of masticatory muscles, orofacial myofunction status and temporomandibular disorder (TMD) severity scores. Forty-two women with TMD (mean 30 years, SD 8) and 18 healthy women (mean 26 years, SD 6) were examined. According to the Research Diagnostic Criteria for TMD (RDC/TMD), all patients had myogenous disorders plus disk displacements with reduction. Surface EMG of masseter and temporal muscles was performed during maximum teeth clenching either on cotton rolls or in intercuspal position. Standardized EMG indices were obtained. Validated protocols were used to determine the perception severity of TMD and to assess orofacial myofunctional status. TMD patients showed more asymmetry between right and left muscle pairs, and more unbalanced contractile activities of contralateral masseter and temporal muscles ( p < 0.05, t -test), worse orofacial myofunction status and higher TMD severity scores ( p < 0.05, Mann–Whitney test) than healthy subjects. Spearman coefficient revealed significant correlations between EMG indices, orofacial myofunctional status and TMD severity ( p < 0.05). In conclusion, these methods will provide useful information for TMD diagnosis and future therapeutic planning.
ISSN:1050-6411
1873-5711
DOI:10.1016/j.jelekin.2011.11.013