補綴学領域における下顎の垂直的ならびに水平的変位に関する筋電図学的研究

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概要

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• Author studied vertical and horizontal movement of mandibles in 10 subjects by means of electromyography (EMG) using bipolar surface electrodes, and following results were obtained. 1) In the resting position of mandible, no EMG activities of Mm, Ta, Tm and Tp were recorded. 2) In the centric position of mandible, EMG activities of Mm, Ta, Tm and Tp of 10∿30 μv tonical spike were obtained. 3) In the case of habitual bite in the centric position of mandible, EMG of Mm, Ta and Tm were in the range of 100∿400 μv. EMG of Tp, however, was slightly lower than those obtained in the Ta and Tm. 4) Under the maximum force of biting, EMG obtained ranged from 400 to 800 μv with Mm, 500 to 600 μv with Ta, 400 to 800 μv with Tm and 100 to 400 μv with Tp. It was confirmed that the activities of Mm, Ta and Tm were found most marked under the maximum force of biting. 5) When high vertical dimensions were given the subjects, EMG obtained from Mm, Ta and Tm were smaller than those obtained with maximum force of biting in the centric occlusion. No significant change, however, was observed with EMG of Tp in this instance. When high vertical dimension were given the subjects, the amplitudes and frequencies of EMG generally became instable, and the muscle force of right and left came to show imbalance. Similar instability of EMG was also observed when the subject was ordered to make protrusive and lateral occlusions. 6) In the experiments in the swallowing with high vertical dimension, EMG from Mm, Ta, Tm and Tp did not show any significant deviation from the same experiment under centric position. In the case of high vertical dimension, however, starting amplitudes were relatively small, but soon approached to normal ones, and then disappeared gradually. The duration of spikes in high vertical dimension, however, amounted to several times that in centric occlusion. All subjects complained difficulty of swallowing during the experiments.

• 九州歯科学会の論文
• 1970-01-31

著者

• 坂本 正朔

  九州歯科大学第1補綴学教室:九州歯科大学生理学教室

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• 補綴学領域における下顎の垂直的ならびに水平的変位に関する筋電図学的研究 : 論文内容の要旨
• 補綴学領域における下顎の垂直的ならびに水平的変位に関する筋電図学的研究
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