title: Association between patterns of jaw motor activity during sleep and clinical signs and symptoms of sleep bruxism.
abstract: The aim of this study was to investigate the association between patterns of jaw motor activity during sleep and clinical signs and symptoms of sleep bruxism. A total of 35 university students and staff members participated in this study after providing informed consent. All participants were divided into either a sleep bruxism group (n = 21) or a control group (n = 14), based on the following clinical diagnostic criteria: (1) reports of tooth-grinding sounds for at least two nights a week during the preceding 6 months by their sleep partner; (2) presence of tooth attrition with exposed dentin; (3) reports of morning masticatory muscle fatigue or tenderness; and (4) presence of masseter muscle hypertrophy. Video-polysomnography was performed in the sleep laboratory for two nights. Sleep bruxism episodes were measured using masseter electromyography, visually inspected and then categorized into phasic or tonic episodes. Phasic episodes were categorized further into episodes with or without grinding sounds as evaluated by audio signals. Sleep bruxism subjects with reported grinding sounds had a significantly higher total number of phasic episodes with grinding sounds than subjects without reported grinding sounds or controls (Kruskal-Wallis/Steel-Dwass tests; P < 0.05). Similarly, sleep bruxism subjects with tooth attrition exhibited significantly longer phasic burst durations than those without or controls (Kruskal-Wallis/Steel-Dwass tests; P < 0.05). Furthermore, sleep bruxism subjects with morning masticatory muscle fatigue or tenderness exhibited significantly longer tonic burst durations than those without or controls (Kruskal-Wallis/Steel-Dwass tests; P < 0.05). These results suggest that each clinical sign and symptom of sleep bruxism represents different aspects of jaw motor activity during sleep.
authors.affiliation: Department of Prosthodontics, School of Dentistry, Showa University, Tokyo, Japan.
authors.forename: Yuya
authors.initials: Y
authors.lastname: Yoshida
authors.affiliation: Department of Prosthodontics, School of Dentistry, Showa University, Tokyo, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Suganuma
authors.affiliation: Department of Prosthodontics, School of Dentistry, Showa University, Tokyo, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Takaba
authors.affiliation: Department of Prosthodontics, School of Dentistry, Showa University, Tokyo, Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Ono
authors.affiliation: Department of Prosthodontics, School of Dentistry, Showa University, Tokyo, Japan.
authors.forename: Yuka
authors.initials: Y
authors.lastname: Abe
authors.affiliation: Department of Prosthodontics, School of Dentistry, Showa University, Tokyo, Japan.
authors.forename: Shuichiro
authors.initials: S
authors.lastname: Yoshizawa
authors.affiliation: Department of Prosthodontics, School of Dentistry, Showa University, Tokyo, Japan.
authors.forename: Takuro
authors.initials: T
authors.lastname: Sakai
authors.affiliation: Department of Prosthodontics, School of Dentistry, Showa University, Tokyo, Japan.
authors.forename: Ayako
authors.initials: A
authors.lastname: Yoshizawa
authors.affiliation: Department of Prosthodontics, School of Dentistry, Showa University, Tokyo, Japan.
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Nakamura
authors.affiliation: Yumino Heart Clinic, Tokyo, Japan.
authors.forename: Fusae
authors.initials: F
authors.lastname: Kawana
authors.affiliation: Department of Prosthodontics, School of Dentistry, Showa University, Tokyo, Japan.
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Baba
mesh_terms: D000328:Adult; D004576:Electromyography; D005260:Female; D006801:Humans; D006984:Hypertrophy / Q000473:pathology / Q000503:physiopathology; D007568:Jaw / Q000503:physiopathology*; D008297:Male; D008406:Masseter Muscle / Q000002:abnormalities / Q000473:pathology / Q000503:physiopathology; D008410:Masticatory Muscles / Q000473:pathology / Q000503:physiopathology*; D009043:Motor Activity; D017286:Polysomnography; D012890:Sleep / Q000502:physiology*; D020186:Sleep Bruxism / Q000175:diagnosis* / Q000473:pathology / Q000503:physiopathology*; D013016:Sound; D014070:Tooth
keywords: clinical signs and symptoms; morning masticatory muscle fatigue or tenderness; polysomnography; report of grinding sounds by sleep partner; sleep bruxism; tooth attrition