Abstract
In quantifying the amount of masticatory muscule activities at the occluding phase in complete denture wearers, we tried to develop the measuring and analyzing system composed of electromyograph and Mandibular Kinesiograph (MKG K 6-I). We studied the measurement accuracy of MKG K 6-I, and the occluding phase was recognized under the setting positional threshold value up to 2 mm vertically. Masticatory muscular electromyogram and mandibular movement under the tapping movement could be simultaneously measured, and the amount of the masticatory muscule activities in the occluding phase could be quantified from the integrated EMG.
The results of this experiment were as follows.
1. Measurement accuracy was good in vertical movement of MKG K 6-I but poor in lateral movenient.
2. Using this measuring and analyzing system, the quantification of masticatory muscule activities which corresponded to opening, closing and occluding phases became possible.
3. The ratio of muscular activities in the occluding phase was about 70-80% of total muscule activities under the tapping movement.
4. A difference between masseter muscles and temporal muscles in the ratio of the amount of muscule activities was not found in the occluding phase.
