マウスピースの硬さと厚さがそしゃく筋活動に及ぼす影響

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  • Effect of Hardness and Thickness of Mouth-pieces on the Masticatory Muscle Activity.

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We'd like to evaluate the influence of mouth-pieces on the systematic muscular power. The purpose of this pilot study was to investigate the effect of hardness and thickness of mouth-pieces on the masticatory muscle activity.Mouth-piece material used for this study was Acryft®(Sumitomo Chemical Industry, Osaka, Japan).Acryft®consisted of a copolymer of ethylene and methyl methacrylate and had two hardness types of soft (WM 506) and hard (WH 202).Acrylic resin material was used as the control.The thicknesses of each material were 3mm and 6mm. The subjects were five young males (average age, 26.4years) with normal dentition.EMG activity of masseter and anterior temporal muscles, in each subject who was wearing one of six types of mouth-pieces, and at the intercuspal position were recorded five times during maximum voluntary clenching for five seconds.Thus the result showed that the EMG activity of the masticatory muscles with mouth-pieces (especially, soft 3 mm, soft 6mm and hard 3mm) significantly increased as compared with that at the intercuspal position.

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