Influence of sleep conditions for bruxism

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K10058
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 57050:Prosthodontics-related
• Research Institution: Nihon University
• Principal Investigator: KOMIYAMA Osamu 日本大学, 松戸歯学部, 教授 (60339223)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 睡眠時ブラキシズム / 顎口腔機能 / 補綴歯科

Outline of Final Research Achievements

This study was conducted to investigate the effect of sleep restriction on sleep conditions and bruxism. Healthy participants participated in an experimental voluntary total sleep restriction (SR) study. In a study design, they were invited to sleep as usual, normal sleep or to restrict their sleep for four nights. Following the SR night, participants were followed for 3 consecutive days including the 2 sleep nights. In NS experiment, all participants were instructed to maintain NS both nights. During all nights, actigraphy data were collected and total sleep time was estimated. On days before and after sleep conditions, all participants underwent measurements EMG activity for repeated masticatory muscle activity, and the Epworth sleepiness scale. The present results suggest that SR affects to sleep bruxism related to sleep conditions.

Free Research Field

補綴歯科学

Academic Significance and Societal Importance of the Research Achievements

本研究により、断眠後の回復睡眠時には、睡眠深度が深い時間が長くなり、微小覚醒の回数は減少し、睡眠時ブラキシズムの回数が減少することが明らかとなった。すなわち、深い睡眠状態が長い、より良質な睡眠を継続的に心がけることで、睡眠時ブラキシズムを減じて、これまで解決困難とされた睡眠時ブラキシズムにより発生する歯科補綴装置の破壊や脱離、咬合性外傷や歯根破折などの歯科的問題を改善できる可能性が示唆された。今後は、より良質な睡眠による、睡眠時ブラキシズムの予防効果と生活の質向上への良好な効果について、さらに検討を続けて行く。