Abstract
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 (P < 0.0000). 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.
Highlights
According to various reports, the prevalence of functional disorders in the population aged 3–74 years ranges from 7% to 84% [1,2,3,4,5,6]
The analysis of changes in the mean power frequency of the two pairs of temporal and masseter muscles (MPF%) showed significant differences in the groups with varying severities of temporomandibular dysfunction according to the Di index (P < 0.0000, Table 4, Figure 1)
Practitioners dealing with functional disorders of the masticatory motor system are interested in global electromyography (surface electromyography (SEMG)) because of the noninvasive nature of measurements that it provides [21,22,23,24,25]
Summary
The prevalence of functional disorders in the population aged 3–74 years ranges from 7% to 84% [1,2,3,4,5,6]. A review of epidemiological studies conducted by McNeill [1] indicates that about 75% of the population has at least one objective symptom of functional disorders, whereas only 33% reports subjective symptoms. It is estimated that a need for treatment is expressed by only 5-6% of a large population of people with temporomandibular dysfunction. A 7% rate in the occurrence of subjective symptoms of temporomandibular dysfunction was reported by List et al [8] in a group of 826 children and adolescents aged 12 to 18 years
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