全部床義歯装着者のそしゃくリズム 機能的評価法による分析

Abstract

Masticatory rhythms of complete denture wearer were examined on electromyograph (EMG) and mandibular kinesiograph (MKG). We developed a method for the analysis of EMG and MKG recordings. By this method it is possible to express the whole masticatory movement, namely from the beginning to the last chewing cycle, by two parameters, “r” and “E”. Parameter “r” is correlation coefficient between the stroke number and the burst duration time of EMG recording divided by mandibular movement phase in one chewing cycle, through the whole mastication. Parameter “E” is a deviation from the regression line of the variables above mentioned.The purposes of this study are as follows; 1) to establish the standard range of “r” and “E” in complete denture wearer and 2) to observe the changes of “r” and “E” in the experimental subject group, from the time of insertion of the new denture, to the end of their adjustment period in complete denture wearer.The result was that the parameter “r” and “E” in each subjects came within the standard range after several adjustments of newly inserted denture in the experimental group.This finding suggests that this masticatory analyzing method is very useful in evaluating the effect of prosthetic treatment.