Abstract
The purpose of this study was to evaluate EMG visual biofeedback (VBF) effects on the treatment of TMJ dysfunction. During a voluntary gum chewing (NBF) and VBF training (BF), EMG from the bilateral masseter and posterior temporal muscles were simultaneously recorded with MKG motion and visualized by MASTICATOGRAPH displaying the power coordination pattern among the four muscles per strokes.Eight patients were instructed to watch their own patterns with an effort to convert them into normal ones. Such a training was performed for seven sessions at weekly interval.1) The abnormal EMG power coordination patterns were successively converted into the normal ones representing significant prominence of working-sidemasseter followed by the other three muscles in activity.2) The grinding-likestrokes seen at the first session were changed into the chopping-like ones with higher synchronicity in onset and offset of EMG bursts at the final session.3) The chewing motion became more reproducible and rhythmical successively.4) Above-mentioned findigs were observed in close agreement with the course of recovery in symptoms.As a general trail of this remedy, it was specurated that desirable effects by VBF training might be noticeable since fifth or sixth session, andNBF-values also might recover close behind the normalized BF-values in the latersessions.
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