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BioMed Research International
Volume 2015, Article ID 269734, 6 pages
Research Article

Muscle Fatigue in the Temporal and Masseter Muscles in Patients with Temporomandibular Dysfunction

1Department of Orthodontics, Pomeranian Medical University of Szczecin, 70111 Szczecin, Poland
2Department of Preclinical Conservative Dentistry and Preclinical Endodontics, Pomeranian Medical University of Szczecin, 70111 Szczecin, Poland
3Department of Conservative Dentistry, Pomeranian Medical University of Szczecin, 70111 Szczecin, Poland

Received 8 August 2014; Revised 11 September 2014; Accepted 14 September 2014

Academic Editor: Mieszko Wieckiewicz

Copyright © 2015 Krzysztof Woźniak et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The aim of this study is to evaluate muscle fatigue in the temporal and masseter muscles in patients with temporomandibular dysfunction (TMD). Two hundred volunteers aged 19.3 to 27.8 years (mean 21.50, SD 0.97) participated in this study. Electromyographical (EMG) recordings were performed using a DAB-Bluetooth Instrument (Zebris Medical GmbH, Germany). Muscle fatigue was evaluated on the basis of a maximum effort test. The test was performed during a 10-second maximum isometric contraction (MVC) of the jaws. An analysis of changes in the mean power frequency of the two pairs of temporal and masseter muscles (MPF%) revealed significant differences in the groups of patients with varying degrees of temporomandibular disorders according to Di (). The study showed an increase in the muscle fatigue of the temporal and masseter muscles correlated with the intensity of temporomandibular dysfunction symptoms in patients. The use of surface electromyography in assessing muscle fatigue is an excellent diagnostic tool for identifying patients with temporomandibular dysfunction.