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EMG differences between weak and strong myogenous CMD patients and healthy controls
A Visser1, G W Kroon, M Naeije
1Department of Craniomandibular Disorders, University of Amsterdam, The Netherlands.
Journal of Oral Rehabilitation
|June 1, 1995
Summary
Myogenous craniomandibular disorder (CMD) patients exhibit distinct electromyographic and clinical differences compared to healthy individuals. These findings highlight functional variations, suggesting personalized treatment approaches for muscle and joint CMD issues.
Area of Science:
- Dentistry
- Neurology
- Biomechanics
Background:
- Craniomandibular disorder (CMD) affects masticatory muscles and jaw function.
- Understanding the electromyographic and clinical profiles of myogenous CMD is crucial for effective treatment.
Purpose of the Study:
- To compare electromyographic and clinical characteristics of myogenous CMD patients with healthy controls.
- To identify functional differences between weak and strong muscle groups within CMD patients.
Main Methods:
- Surface electromyography (EMG) of masseter and temporal muscles.
- Clinical assessments including mouth opening, endfeel, laterotrusion, dental abrasion, and pain.
- Analysis of condylar and ramus asymmetry from X-rays.
Main Results:
- CMD patients showed lower masseter and temporal EMG amplitudes and proportionally higher temporal muscle activity.
- CMD patients exhibited reduced mandibular excursions, increased endfeel distances, and more dental abrasion.
- Weak CMD patients displayed greater temporal muscle activity, muscle/joint asymmetries, and endfeel distances compared to strong CMD patients.
Conclusions:
- Electromyographic and clinical findings reveal functional differences in myogenous CMD patients.
- These differences underscore the need for individualized treatment strategies for CMD management.