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A computer-based system for measuring the masseteric silent period.

AbstractMeasurement of the masseter muscle's silent period may become an important tool in the diagnosis and prognosis of dysfunction of the stomatognathic system. It is therefore important that a standardized method be used to measure this phenomenon. This article describes a system in which a two-channel visual biofeedback electromyograph is used so that the subject can exert the same force each time the silent period is elicited by the clinician's tapping on the subject's chin with a reflex hammer. Raw EMG signals are recorded from both masseter muscles. The signals are then rectified and fed into a computer that is programmed to detect periods in which the EMG activity is lower than the activity due to clenching. The signals are sampled every 0.4 msec, and they are then expressed graphically and in numerical values.