Muscular activity and chewing force: a polygraphic study of human mandibular movements.

Abstract A polygraphic method has been developed for studying the relationship between EMG activity, mandibular movements and chewing forces. It was found that maximal chewing force was developed during the occlusal phase of the masticatory cycle. Mean time interval between peak chewing force and beginning of the opening phase was 69 ± 2 msec. Peak integrated EMG precedes maximal chewing force by 41 ± 2 msec. The chewing force outlasts the occlusal phase. Integrated EMG can be used as a reliable index to both chewing (homogeneous bolus) and biting forces.