Masticatory Muscle Activity in Patients With Pain-related Temporomandibular Disorders

Pomeranian Medical University Szczecin90 enrolled

Overview

The aim of this study was to evaluate masticatory muscle electrical activity in patients with pain-related and pain-free temporomandibular disorders (TMD) as well as in subjects with no TMD. Ninety children with mixed dentition were recruited to the study. Of this total, 30 subjects were diagnosed with pain-related TMD, 30 with pain-free TMD, and 30 without TMD. We used Axis I of the Research Diagnostic Criteria for TMD (RDC/TMD) to assess the presence of TMD in the examined children. The electromyographical (EMG) potentials of the temporalis and masseter muscles were measured with a DAB-Bluetooth Instrument (Zebris Medical GmbH, Germany) at rest and during maximum voluntary clenching (MVC).

Study Type

OBSERVATIONAL

Enrollment

Conditions

TMD

Interventions

electromyographyDIAGNOSTIC_TEST

Surface electromyography (sEMG) was used as an additional non-invasive tool for assessing patients with TMD.The electromyographical (EMG) potentials of the temporalis and masseter muscles were measured with a DAB-Bluetooth Instrument (Zebris Medical GmbH, Germany) at rest and during maximum voluntary clenching (MVC).

Medical Language ↔ Plain English

Inclusion Criteria: * mixed dentition (the subjects should be aged between 7 and 12 years) * consent to participate voluntarily in the study Exclusion Criteria: * subjects who had undergone orthodontic or masticatory motor system dysfunction treatment, had systemic or rheumatologic diseases, a history of mouth breathing, surgery, traumas or malformations in the head and neck region

Outcomes

Primary Outcomes

Electromyographic analysis of the masticatory muscles in patients with pain-related temporomandibular disorders

A DAB-Bluetooth Instrument (Zebris Medical GmbH, Germany) was used to take electromyographical (EMG) recordings of the temporalis and masseter muscles at rest and during maximum voluntary contraction (MVC).Disposable, self-adhesive Ag/AgCl bipolar surface electrodes were placed at a fixed inter-electrode distance of 20 mm on the anterior temporal muscles and on the superficial masseter muscles parallel to the muscular fibres. The EMG signals were amplified, digitized and digitally filtered. The EMG results were analysed using the Student t-test, analysis of variance (ANOVA) and a Student-Newman-Keuls post-hoc test.

Time frame: For a single subject the whole EMG examination was taken 40 minutes.