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Is temporomandibular dysfunction a cranial dystonia? An electrophysiological study
1Neurological Department, Valduce Hospital, Como, Italy.
Headache
|September 1, 1994
Summary
Temporomandibular dysfunction (TMD) patients show varied silent period (ES) patterns in masseter muscles, suggesting central nervous system origins. These patterns indicate different muscle excitability states, pointing to brainstem or basal ganglia involvement in TMD.
Area of Science:
- Neurology
- Dentistry
- Physiology
Background:
- Temporomandibular dysfunction (TMD) is a complex condition affecting masticatory muscles.
- The silent period (ES) in electromyography provides insights into the neural control of muscle activity.
Purpose of the Study:
- To investigate the characteristics of the silent period (ES) in patients with TMD.
- To explore potential central nervous system mechanisms underlying TMD based on ES patterns.
Main Methods:
- Electromyographic (EMG) recordings of the masseter muscles were performed in 26 TMD patients.
- Electrical stimulation was used to elicit the silent period (ES), comprising early (ES1) and late (ES2) inhibition phases.
Main Results:
- Four distinct ES patterns were identified: normal (8 patients), absent ES (1 patient), absent ES2 (11 patients), and combined ES1/ES2 absence (6 patients).
- These patterns suggest varying states of muscle excitability, including normal, absolute/relative inexcitability, and hyperexcitability.
Conclusions:
- The diverse ES patterns in TMD patients support a central nervous system origin for the dysfunction.
- Dysregulation in brainstem circuits or basal ganglia control centers may underlie TMD pathophysiology.