Abstract
The purpose of this study was to elucidate the unloading reflex of masticatory muscles during pulverizing of food.EMG, incisal movement and velocity and pulverizing sound were recorded in 8 normal subjects. EMG was recorded at the superior head (SLpt) and inferior head (ILpt) of the lateral pterygoid muscle, the anterior digastric muscle (Da), the temporal muscle (Tp) and the masseter muscle (Mm).1. After discharging, silent period of the SLpt, Tp, and Mm and excitatory response of ILpt and Da were observed.2. The rate of discharging reflex increased in accordance with the increase of incisal velocity.3. The latency of discharging reflex was 23.0 msec for the ILpt, 20.6 msec for the Da.4. The latency of the silent period was 7.7 msec for the SLpt, 8.6 msec for the Tp, 9.5 msec for the Mm. The duration of silent period was 39.2 msec, 37.6 msec, 38.2 msec respectively.
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