そしゃく筋筋電図による全部床義歯機能時のこう合力算出法

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  • Calculations of Biting Forces during Isometric Contractions of Masticatory Muscles by Electromyograms of Complete Denture Wearers.

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A method for calculating the biting forces in healthy subjects with natural dentitions by electromyographic recording has been developed previously by T. Okajima (Tsurumi Univ Dent J 12: 367-390, 1986). This method was compared with two others for calculating the biting forces during voluntary isometric contractions in complete denture wearers. The other two methods were a calculation by curvilinear regression analysis and a calculation of the biting forces directly from data on the scatter diagram. Two conditions of isometric contractions of masticatory muscles of 10 subjects were tested. The two conditions labelled F and R differed from each other in the frequency of the contractions over a period of five seconds. The contraction cycle time of the condition F was approximately 1 sec. and the condition R was approximately 0.63 sec. In both conditions (F, R), no linearlity between the integrated electromyograms and the biting forces was found, moreover as the frequency was increased the correlation coefficients tended to decrease. By comparing the calculated values for the biting force with the known actual values, the errors in the calculation by curvilinear regression and the calculation of the biting force directly from the scatter diagram were significantly smaller than the calculation by linear regression analysis (p<0.01). There was no significant difference between the errors of the calculation by curvilinear regression and the calculation of the biting forces directly from the scatter diagram.

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