[The evaluation of prognosis in complete denture wearers using masticatory electromyogram. Part 1. Comparison between the group immediately after the insertion and the group with good prognosis in complete denture wearers]

The purpose of this study was to examine the validity of EMG parameters as evaluation of the prognosis in complete denture wearers. In this study, the comparisons had been made between two groups. One group was consist of the subjects who were immidiately after the insertion of new complete dentures (group A). Another group was consist of the subjects who had good prognosis (group B). EMG signals were evoked by tapping movement and chin tap. 4 Muscles-4 Division Coordination Pattern Analysis was used, and the name of each division was follows:B. T. C.: EMG activity of before tooth contactS. P. L.: Silent period latencyS. P. D.: Silent period durationA. S. P.: EMG activity of after silent period EMG signals analyzed automatically with minicomputer system and paramaters (duration and mean average of integration on each division) were investigated whether the differences were significant or not.The results were as follows:1) Recognition ratio of silent period of the group A showed a slightly tendency to be lower than the group B.2) Both of tapping and chin tap, the difference between the group A and the group B was not statistically significant on each division.3) So, it was difficult to evaluate the prognosis in complete denture on the statistical aspects.