Electromyographic ratio of masseter and anterior temporalis muscles in children with and without temporomandibular disorders.

Autor: Chaves TC; Department of Neurosciences and Behavioral Sciences, Post Graduate Program in Rehabilitation and Functional Performance, Ribeirão Preto School of Medicine, University of São Paulo - USP, Brazil. Electronic address: chavestc@fmrp.usp.br., Dos Santos Aguiar A; Post-Graduate Program in Rehabilitation and Functional Performance, Ribeirão Preto School of Medicine, University of São Paulo - USP, Brazil., Felicio LR; Physical Therapy Department, Post-graduate program in Physical Therapy, Federal University of Uberlândia, Brazil., Greghi SM; Post-Graduate Program in Rehabilitation and Functional Performance, Ribeirão Preto School of Medicine, University of São Paulo - USP, Brazil., Hallak Regalo SC; Department of Morphology, Physiology and Basic Pathology, School of Dentistry of Ribeirão Preto, Post-graduate Program in Rehabilitation and Functional Performance, University of São Paulo, Brazil., Bevilaqua-Grossi D; Department of Biomechanics, Medicine and Locomotor Apparatus Rehabilitation at Ribeirão Preto School of Medicine, Post-graduate Program in Rehabilitation and Functional Performance, University of São Paulo-USP, Brazil.
Jazyk: angličtina
Zdroj: International journal of pediatric otorhinolaryngology [Int J Pediatr Otorhinolaryngol] 2017 Jun; Vol. 97, pp. 35-41. Date of Electronic Publication: 2017 Mar 18.
DOI: 10.1016/j.ijporl.2017.03.022
Abstrakt: Objective: This study investigated differences in surface electromyography (sEMG) activity of the masseter and anterior temporalis muscles in children with and without temporomandibular disorders (TMD).
Participants: Thirty-four children aged 8-12 years were recruited, comprising 17 children with TMD and 17 without TMD (control group [CG]). The children were quasi-matched for sex, age, weight, and height. sEMG data were obtained using Myosystem ® Br-1 equipment with 12 channels to evaluate the bilateral masseter, anterior temporalis, and suprahyoid muscles. For sEMG analysis, raw and normalized root mean square (RMS) values were obtained at rest and during maximum clenching. The sEMG ratios of the raw RMS data of the bilateral masseter in relation to the anterior temporalis muscles (sEMG-M/AT ratio) were also assessed. Mann-Whitney tests (p ≤ 0.05) were used to compare sEMG ratio between TMD group and CG.
Results: Significant prevalences of pain during chewing (53% vs. 0%, X 2  = 5.87, p = 0.01), TMJ pain (58% vs. 0%, X 2  = 6.67, p = 0.01), neck pain (58% vs. 18%, X 2  = 3.77, p = 0.05) and pain in the temples (47% vs. 6%, X 2  = 5.44, p = 0.02) were identified in the TMD group compared to CG. Our results revealed lower sEMG-M/AT ratios during maximum clenching (p = 0.01) in children with TMD compared to those in the asymptomatic CG.
Conclusion: The results showed that children with TMD preferentially used their temporalis muscles during maximum voluntary clenching, probably as a consequence of nociceptive inputs in order to obtain pain relief.
(Copyright © 2017 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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