title: Time-variant nature of sleep bruxism outcome variables using ambulatory polysomnography: implications for recognition and therapy evaluation.
abstract: The aim of this study was to quantify the time-variant nature of sleep bruxism (SB) and to discuss its consequences. Six clinically diagnosed bruxers and six non-bruxers participated. Four ambulatory polysomnographic (PSG) recordings were obtained for every participant. As SB outcome variables, the number of episodes per hour of sleep (Epi h(-1)), the number of bursts per hour (Bur h(-1)) and the bruxism time index (BTI: the percentage of total sleep time spent bruxing) were established. To quantify the time-variant nature of SB, standard errors of measurement (SEMs) were calculated. For the non-bruxers, the SEMs for Epi h(-1), Bur h(-1) and BTI were 1.0, 5.7 and 0.1. For the bruxers, the respective values were 2.1, 14.9 and 0.4. In the discussion, arguments are given that because of the time-variant nature of the PSG recordings, cut-off bands around cut-off points might be useful for the recognition of SB.
authors.affiliation: Department of Oral Function, Academic Centre for Dentistry Amsterdam, ACTA, Amsterdam, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: Van Der Zaag
authors.forename: F
authors.initials: F
authors.lastname: Lobbezoo
authors.forename: C M
authors.initials: CM
authors.lastname: Visscher
authors.forename: H L
authors.initials: HL
authors.lastname: Hamburger
authors.forename: M
authors.initials: M
authors.lastname: Naeije
mesh_terms: D000328:Adult; D015986:Confounding Factors, Epidemiologic; D005260:Female; D006801:Humans; D008297:Male; D008406:Masseter Muscle / Q000503:physiopathology*; D008875:Middle Aged; D018670:Monitoring, Ambulatory / Q000379:methods; D017286:Polysomnography / Q000379:methods; D020186:Sleep Bruxism / Q000150:complications / Q000503:physiopathology* / Q000628:therapy; D012894:Sleep Stages / Q000502:physiology*; D012895:Sleep, REM; D013997:Time Factors