Abstract
The present study aimed to evaluate the surface electromyography (sEMG) activity of the masseter muscles in patients with a history of temporomandibular joint disorder (TMJD) who received orthodontic treatment. In total, 22 participants aged 18–35 years old were included in this study. They were divided into the control group (patients without a history of TMJD [n = 11]) and the test group (those with a history of TMJD [n = 11]). Each participant underwent sEMG of the right and left masseter muscles at 5-s maximum voluntary contraction (MVC). Results showed that the TMJD group had a lower sEMG activity of masseter muscles at MVC than the non-TMJD group. However, the differences were not statistically significant (p > 0.05, t-test). The Spearman’s correlation coefficient test revealed a weak negative correlation between muscle activity on sEMG and history of TMJD (p > 0.05). In conclusion, orthodontically treated patients in TMJD group have reduced masseter muscle activity during MVC, compare to the non-TMJD group.
Highlights
Temporomandibular joint disorder (TMJD) is a relatively common condition affecting the physiological functions of the stomatognathic system
TMJD is frequently associated with problems in the masticatory system, which is composed of the masticatory muscles, temporomandibular joint (TMJ), and surrounding structures
Whilst functional examination of stomatognathic system to measure masticatory muscle activity could be evaluated by using the electromyography
Summary
Temporomandibular joint disorder (TMJD) is a relatively common condition affecting the physiological functions of the stomatognathic system. TMJD is frequently associated with problems in the masticatory system, which is composed of the masticatory muscles, temporomandibular joint (TMJ), and surrounding structures. The characteristics of TMJD include TMJ and/or masticatory muscle pain, TMJ sounds, and chewing difficulties. TMJD is correlated with trauma, anatomical structure, pathophysiological and psychosocial factors. Malocclusion and occlusal interference are considered to be the risk factors of TMJD (Henrikson & Nilner, 2003). Clinical examinations and radiographic imaging, such as magnetic resonance imaging and computed tomography scan are the gold standard procedures for diagnosing TMJD (Tartaglia et al, 2011; Politti et al, 2016). Whilst functional examination of stomatognathic system to measure masticatory muscle activity could be evaluated by using the electromyography
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