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In order to clarify whether the velocity of chewing movement would be a reliable indicator for objective evaluation of masticatory function, the chewing movement velocity of the mandibularincisal points of 100 normal subjects and 100 craniomandibular disorders (CMD) were analyzed. The results were as follows:1. For the maximum velocity of opening and closing, individual differences were observed in both groups. The average maximum velocities were 149.4 mm/sec (opening) and 149.6mm/sec (closing) in the normal subject group and 109.7mm/sec (opening) and 106.0 mm/sec (closing) in the CMD patient group, and significant differences were found between the two groups.2. For the normal subject group there was a highly significant positive correlation between the amount of opening and the maximum velocity of opening and closing.3. The average SD/OD (standard deviation/opening distance) of the velocity component were 0.78 (opening) and 0.77 (closing) for the normal subject group and 1.14 (opening) and 1.00 (closing) for the CMD patient group, and significant differences were found between the two groups.4. From the above, it was concluded that the maximum chewing velocity and the SD/OD of the velocity component of opening and closing were highly effective indicators to objectively evaluate themasticator function.

The Analysis of Masticatory Movements. Quantitative Evaluation of the Velocity of Mandibular Incisal Point.