Abstract
ABSTRACT BACKGROUND AND OBJECTIVES: Craniomandibular and cervical symptoms interfere with mandibular stability. Determining whether these disorders influence muscle activation when chewing, it is possible to improve interventions for this population. The objective of this study was to verify the effect of the temporomandibular joint dysfunction, craniomandibular and cervical pain on the electromyographic activity of the masticatory muscles during rest and mandibular isometry. METHODS: Fifty-five women aged between 18 and 30 years were divided into two groups: with temporomandibular dysfunction (n=28) and without temporomandibular dysfunction (n=27). The diagnosis of temporomandibular dysfunction was established using the Research Diagnostic Criteria for Temporomandibular Disorder (RDC/TMD). The RDC was also used to determine the presence of craniomandibular pain. Cervical pain was defined by physical examination. The electromyographic activity of masseter and temporalis muscles was evaluated in the rest position and mandibular isometry. The amplitude of muscle activation was represented by the root mean square values (RMS%) and normalized by maximum voluntary contraction. The Mann-Whitney U test was used to detect differences between the groups with and without temporomandibular dysfunction; with and without myofascial craniomandibular pain; and with and without cervical myofascial pain. RESULTS: It was observed greater amplitude in the activation of masseter and right temporalis muscles in the rest position in individuals with myofascial craniomandibular pain compared to asymptomatic (p<0.05). There was no difference among individuals with and without cervical myofascial pain, and with and without temporomandibular dysfunction. CONCLUSION: The presence of myofascial craniomandibular pain did not affect the masticatory activity, with greater muscle activation in mandibular rest.
Highlights
Temporomandibular disorder (TMD) is characterized by a group of clinical conditions associated with noises and blockages in the temporomandibular joint (TMJ)[1]
The purpose of this study was to verify the effect of TMD, myofascial, craniomandibular and cervical pain on the electromyographic activity of the masticatory muscles during rest and mandibular isometry
This study evaluated the electric activity behavior of the masticatory musculature during rest and mandibular isometry in women with and without TMD, seeking to understand the effect of the craniomandibular myofascial pain and mandibular pain on the activity of these individuals’ masticatory muscles
Summary
Temporomandibular disorder (TMD) is characterized by a group of clinical conditions associated with noises and blockages in the temporomandibular joint (TMJ)[1]. Mandibular movements’ dysfunctions may be influenced by cervical symptoms in TMDpatients These symptoms’ frequency in this population suggests the presence of compensatory strategies, aiming at promoting stability for mandibular movements and maintaining the musculoskeletal system functional effectiveness[12]. This way, it is important to consider cervical and craniomandibular symptoms during masticatory muscle evaluation. The purpose of this study was to verify the effect of TMD, myofascial, craniomandibular and cervical pain on the electromyographic activity of the masticatory muscles during rest and mandibular isometry. The objective of this study was to verify the effect of the temporomandibular joint dysfunction, craniomandibular and cervical pain on the electromyographic activity of the masticatory muscles during rest and mandibular isometry. CONCLUSION: The presence of myofascial craniomandibular pain did not affect the masticatory activity, with greater muscle activation in mandibular rest
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