Masticatory Muscle Activity in Patients With Pain-related Temporomandibular Disorders

The Use of Electromyography in the Assessment of Masticatory Muscle Activity in Patients With Pain-related Temporomandibular Disorders

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 Overview

• Status: Completed
• Conditions: TMD
• Intervention / Treatment: Diagnostic test: electromyography

• Study Type: Observational
• Enrollment (Actual): 90

Contacts and Locations

Study Locations

• Poland
  • Szczecin, Poland
    • Pomeranian Medical University, Department of Orthodontics

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 7 years to 12 years (CHILD)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

• Sampling Method: Probability Sample

Study Population

The subjects were selected from patients who had been referred to the Orthodontic Clinic in Szczecin, Poland for orthodontic treatment.

Description

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

Study Plan

How is the study designed?

Number of groups / cohorts

3

Cohorts and Interventions

Group / Cohort	Intervention / Treatment
TMD-pain group; The TMD-pain group consisted of 30 children aged between 7.1 and 12.3 with a pain-related TMD diagnosis. All the patients in the TMD-pain group had myogenous or arthrogenous TMD according to the RDC/TMD protocol.	Diagnostic test: electromyography; 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).
pain-free TMD group; The pain-free TMD group consisted of 30 children between 7.3 and 12.6 years of age. To be included in the pain-free TMD group the participants had to meet Axis I of the RDC/TMD criteria for a pain-free diagnosis.	Diagnostic test: electromyography; 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).
non-TMD group; The non-TMD group comprised 30 children aged between 7.2 and 12.5 without any recognised TMD based on RDC/TMD, Axis I.	Diagnostic test: electromyography; 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).

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
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.	For a single subject the whole EMG examination was taken 40 minutes.

Collaborators and Investigators

• Sponsor: Pomeranian Medical University Szczecin

Study record dates

Study Major Dates

• Study Start (ACTUAL): December 2, 2019
• Primary Completion (ACTUAL): February 3, 2020
• Study Completion (ACTUAL): February 3, 2020

Study Registration Dates

• First Submitted: May 26, 2020
• First Submitted That Met QC Criteria: May 26, 2020
• First Posted (ACTUAL): June 1, 2020

Study Record Updates

• Last Update Posted (ACTUAL): June 1, 2020
• Last Update Submitted That Met QC Criteria: May 26, 2020
• Last Verified: May 1, 2020

More Information

Terms related to this study

• Keywords: masticatory muscles; muscle activity; surface electromyography
• Additional Relevant MeSH Terms: Joint Diseases; Musculoskeletal Diseases; Muscular Diseases; Stomatognathic Diseases; Jaw Diseases; Craniomandibular Disorders; Mandibular Diseases; Myofascial Pain Syndromes; Temporomandibular Joint Disorders; Temporomandibular Joint Dysfunction Syndrome
• Other Study ID Numbers: 0012/08/15

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: UNDECIDED

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No