Elbow flexion strength during teeth clenching in horizontally different mandibular positions.
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概要
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To elucidate the interrelationship between the occlusal function and the bodily motor function, the clenching force, the masticatory muscle activity, the elbow flexion strength and the biceps muscle of arm activity during the maximum voluntary elbow flexion exercise were recorded and analyzed at horizontally different mandibular positions. Twelve normal dentate males (23-24 years) who realized the teeth clenching during a maximum voluntary efforts in physical exercise were selected as the subjects. The clenching force was measured by the sensor made with the pressure sensitive conductive silicone rubber sheet. This sensor was 20 mm square rubber sheet sandwiched by the copper foil contact plate for electrode and covered by polyimide resin for electrical insulation. In this total sensor, coefficient of variation was 1.67 % in 5 repeated measurements of output voltage. The correlation coefficient between the load and output voltage was 0.99. Measuring system of the clenching force was constructed by this sensor on the mandibular metal plate with a thickness of 2.0 mm and the central bearing point on the palatal metal plate.<BR>The results obtained are as follows.<BR>1) All the subjects were divided into two groups by the clenching force manifested during elbow flexion exer cise, namely, the hard clenching group (58.9-85.3 kgf) and the soft clenching group (4.9-13.2 kgf) .<BR>2) In the hard clenching group, the maximum clenching force and the minimum standard deviation were demonstrated at the tapping point of mandible.<BR>3) The maximum elbow flexion strength was demonstrated at the tapping point in both groups.<BR>4) In the hard clenching group, the positive correlation coefficient between the clenching force and the elbow flexion strength was statistically significant (r=0.69, p<0.01) . On the other hand, there was no statistically significant result in the soft clenching group (r=0.04, p>0.05) .<BR>In this study, the occlusal function is suggested to be closely interrelated with the bodily motor function.
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