睡眠中の歯軋の生理学的研究

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  • Physiology of the tooth-grinding during sleep

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Polygraphical recordings performed on tooth-grinders have made it possible to realize the description of phenomenological features and the speculative penetration into the central mechanism of tooth-grinding (TG) during sleep which is encountered rather frequently among the population.<BR>The TG commences at any sleep stage, but mainly on the background of lighter sleep stages. The cessation of TG is followed by a sleep lighter than that before the episode. The episodes of TG are frequently preceded by a K-complex and followed by α-waves. They appear sometimes on the background of recurring α-waves in drowsy subjects. The beginning of TG never fails to be associated with any kind of sympathetic discharges such as tachycardia, the vasoconstriction of the finger-tip, and the skin potential changes on the forearm and on the palm. The amplitude of the Hoffmann reflex is greatly reduced during TG just like as upon conventional arousal reactions which are associated with gross body movements, but not with TG.<BR>The behavior of the polygraphical indices and especially the fact that the TG was able to be induced by arousing stimuli, clearly indicate that the TG is triggered when sleep becomes abruptly lighter and that it manifests itself during transition from sleep to wakefulness, that is, it is one kind of arousal reaction.<BR>The results from the experiments on the animals together with the clinical observations suggest that transitory dissociation of the functioning of the ascending activating systems would be the basic mechanism behind the TG.

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