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Title: 顎機能異常者の睡眠時と食事時における咬筋活動の比較検討
Other Titles: Comparison between masseteric activities during sleep and meal time in patients with parafunction in masticatory muscles
Authors: 中島, 利徳 Browse this author
山口, 泰彦 Browse this author →KAKEN DB
三上, 紗季 Browse this author →KAKEN DB
斎藤, 未來 Browse this author
渡辺, 一彦 Browse this author
岡田, 和樹 Browse this author →KAKEN DB
後藤田, 章人 Browse this author →KAKEN DB
谷内田, 渉 Browse this author →KAKEN DB
Keywords: bruxism
%MVC values
duration of burst
Issue Date: Sep-2016
Publisher: 北海道歯学会
Journal Title: 北海道歯学雑誌
Volume: 37
Issue: 1
Start Page: 11
End Page: 19
Abstract: 本研究の目的は,ブラキシズム習癖を有する顎機能異常者の日常生活中の咬筋筋電図波形の大きさ,持続時間に関し,睡眠時と咀嚼時の間での関係を明らかにすることである.  被験者は,北海道大学病院を受診し,ブラキシズムの診断を受けた25名である.ウェアラブル超小型筋電計を用い,夜間,日中の咬筋活動を測定した.  食事時の波形は基線振幅3倍以上,持続時間0.08秒以上,間隔0.08秒以上で抽出した(基線3倍条件).睡眠時は食事時と同様の条件の他に,持続時間0.25秒以上,基線振幅2倍以上でも抽出した(基線2倍条件).さらに,食事時と睡眠時基線2倍条件で,20%MVC(maximum voluntary contraction)以上の波形のみの抽出条件も加えた.  波形の振幅(%MVC値)は,何れの条件でも睡眠時全波形より食事時の方が大きかった(p<0.01).また,何れの条件でも,睡眠時全波形,phasic波形(持続時間0.25-2秒),tonic波形(持続時間2秒以上)の各% MVC値と食事時との間に正の相関を認めた(p<0.05).何れの条件でも波形の持続時間は,睡眠時全波形が食事時よりも長かった(p<0.01).基線2倍条件phasic波形,20% MVC以上条件の全波形とphasic波形の持続時間は,食事時波形の持続時間と正の相関を示した(p<0.05).  以上より,ブラキシズム患者の睡眠時咬筋活動は,咀嚼時に比較して弱く長いことが示唆された.%MVC値及び持続時間の一部において,食事時と睡眠時の間に有意な正の相関が認められたが相関係数は高くはないことがわかった.これは,被験者の性別や年齢などの影響を及ぼす可能性のある変数が被験者の背後に存在している可能性を考慮していないために生じることが考えられた.また,背景の条件を考慮するには,標本数が少ないことも根本的な問題点として残されていると考えられた.
In this study, we aimed to clarify the relationship between masseter muscle activities during periods of eating meal and during periods of sleep. We analyzed this in regard to amplitude and the duration of electromyographic (EMG) bursts in the daily life of patients with parafunction in masticatory muscles.  The subjects consisted of twenty-five outpatients who had a bruxism diagnosis at Hokkaido University hospital. Masseter muscle activities during the night and day was measured by using an ultraminiature wearable electromyogram system. EMG bursts more than three times the baseline amplitude, 0.08-second duration and 0.08-second interval (3-BL) during meal time were selected. EMG bursts during sleep were selected with the same condition as meal time. EMG bursts more than two times the baseline amplitude and 0.25-second duration were also selected during sleep (2-BL). Further, EMG bursts more than 20% of the amplitude of maximum voluntary contraction in meal time (3-BL) and sleep (2-BL) were selected (20%MVC). Phasic bursts (duration: 0.25-2sec) and tonic bursts (duration: more than 2sec) were also selected from EMG bursts during sleep. The average of %MVC values and duration were calculated for each patient.  The burst amplitude (%MVC values) at meal time were larger than those in sleep periods in every condition (p<0.01). Moreover, significant positive correlations were found between %MVC values during meal time and during periods of sleep in every condition (p<0.05). Burst durations during sleep were longer than those during meal time in every condition (p<0.01). As for burst durations between meal time and periods of sleep, positive correlations were shown in regard to phasic bursts (2-BL), all bursts (20%MVC) and phasic bursts (20%MVC).  These findings suggested that masseter muscles of patients with bruxism exert weaker but longer activity during periods of sleep than during meal time. This study shows that a correlation coefficient was not high, while at %MVC values and burst durations a significant positive correlation was found between meal time and sleep periods in some conditions. This was due to leaving aside the possibility that factors including difference of gender and age affecting correlation coefficient were present. This is also considering those fundamental problems that samples were small.
Type: article
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