Pattern of Electromyographic Activity in Mastication Muscles of Adolescents with Temporomandibular Disorder

Abstract

[Purpose] The aim of the present study was to assess the behavior of the mean and median frequencies of the electromyography signal of the mastication muscles of adolescents with different degrees of TMD severity. [Subjects] Forty-two adolescents aged 14 to 18 years. [Methods] The adolescents were classified according to severity using the Helkimo Index. The control group consisted of 14 subjects with no signs or symptoms of TMD. Three readings were taken in during maximum intercuspation and mandibular rest, with each reading lasting 10 seconds. [Results] Significant differences (p=0.0001) were found in the mean frequency (Hz) between the control group (CG), mild TMD group (MG) and moderate/severe TMD group (MSG), especially during mandibular rest, for all muscles evaluated: right temporal: CG (137.5), MG (194.2), MSG (291.7); left temporal: CG (106.9), MG (200.6), MSG (294.2); right masseter: CG (155.7), MG (242.8), MSG (278.3); left masseter: CG (125.0), MG (214.6), MSG (316.7). Greater differences among groups were found under the condition of mandibular rest. Conclusions: Adolescents with TMD especially those with more severe symptoms exhibit hyperactivity of the mastication muscles.

Accuracy of the surface electromyography RMS processing for the diagnosis of myogenous temporomandibular disorder

“…In the amplitude domain, Tartaglia et al (2011Tartaglia et al ( , 2008 used the RMS processing with normalized data; Santana-Mora et al (2014) and Santana-Mora et al (2009) used the integrated processing with non-normalized data. In the frequency domain, Lauriti et al (2013) and Lodetti et al (2012) used the mean and median frequency of the electromyographic signal processed by the Fast Fourier Transformed.…”

“…Researchers have used different types of materials placed on the first and second mandibular molar teeth (bilaterally) during MVC. Among them, Lauriti et al (2014Lauriti et al ( , 2013 performed the MVC using parafilm ;De Felício et al (2012) and Tartaglia et al (2011) performed the MVC in intercuspal position (without any material placed on the molar teeth) and using cotton rolls. It is worth mentioning that the present study used the parafilm during MVC.…”

Use of the universal pain assessment tool for evaluating pain associated with TMD in youngsters with an intellectual disability

“…They suggest that treatment focussing on coping with psycho-emotional problems could be effective by diminishing excessive masticatory muscle tension. Myogenous TMD is frequently considered to be the most common type of TMD and is generally caused by increased muscle activity triggered by emotional stress (25). As far as the TMJ screening was performed during the Special Olympics event, when the athletes were taking part in the sports competition, the stress factor should be taken into consideration while interpreting the results.…”

Electromyography and asymmetry index of masticatory muscles in undergraduate students with temporomandibular disorders

“…Temporomandibular dysfunction (TMD) is a disorder of the stomatognathic system characterized by the presence of pain in the preauricular region, fatigue of masticatory muscles (MM), limitation or deviation during movement of the temporomandibular joint (TMJ) and could be associated to noise during opening and closing the mouth [1][2] . The difficulty of identifying the TMD is related to its multifactorial etiology and the complex relationship of TMJ with other structures of the head, neck and scapular waist 3 , apart from an important relationship with emotional factors, especially in adolescents 2,4 . The main muscles affected in this dysfunction are the temporal (anterior and posterior), masseter (superficial and deep), pterygoid (medial and lateral) and digastric muscles 5 .…”

“…Several questionnaires were prepared for the assessment of TMD signs and symptoms, and currently the most widely used method for classification is the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) 4 . Nevertheless, the index proposed by Helkimo 7 (1994) has been clinically used to classify the severity levels of TMD, especially in epidemiological survey studies [1][2][3][4]6 . Fonseca et al 8 (1994) based on the Helkimo index 7 translated and validated the questionnaire into Portuguese with 95% reliability and good correlation with the Helkimo index.…”