title: Polysomnographic study of the prevalence of sleep bruxism in a population sample.
abstract: The goal of the current study was to estimate the prevalence of sleep bruxism (SB) in the general population using a representative sample of 1,042 individuals who answered questionnaires and underwent polysomnography (PSG) examinations. After PSG, the individuals were classified into 3 groups: absence of SB, low-frequency SB, and high-frequency SB. The results indicated that the prevalence of SB, indicated by questionnaires and confirmed by PSG, was 5.5%. With PSG used exclusively as the criterion for diagnosis, the prevalence was 7.4% regardless of SB self-reported complaints. With questionnaires alone, the prevalence was 12.5%. Of the 5.5% (n = 56) with confirmed SB, 26 were classified as low-frequency SB, and 30 as high-frequency. The episodes of SB were more frequent in stage 2 sleep, and the phasic bruxism events were more frequent than tonic or mixed events in all sleep stages in individuals with SB. A positive association was observed between SB and insomnia, higher degree of schooling, and a normal/overweight body mass index (BMI). These findings demonstrate the prevalence of SB in a population sampled by PSG, the gold standard methodology in the investigation of sleep disorders, combined with validated questionnaires.
authors.affiliation: Departamento de Psicobiologia, Universidade Federal de São Paulo, São Paulo, Brazil.
authors.forename: M
authors.initials: M
authors.lastname: Maluly
authors.forename: M L
authors.initials: ML
authors.lastname: Andersen
authors.forename: C
authors.initials: C
authors.lastname: Dal-Fabbro
authors.forename: S
authors.initials: S
authors.lastname: Garbuio
authors.forename: L
authors.initials: L
authors.lastname: Bittencourt
authors.forename: J T T
authors.initials: JT
authors.lastname: de Siqueira
authors.forename: S
authors.initials: S
authors.lastname: Tufik
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015992:Body Mass Index; D001835:Body Weight; D004522:Educational Status; D004576:Electromyography / Q000706:statistics & numerical data; D006801:Humans; D008875:Middle Aged; D009765:Obesity / Q000453:epidemiology; D050177:Overweight / Q000453:epidemiology; D017286:Polysomnography / Q000706:statistics & numerical data*; D011159:Population Surveillance; D015995:Prevalence; D020186:Sleep Bruxism / Q000453:epidemiology*; D007319:Sleep Initiation and Maintenance Disorders / Q000453:epidemiology; D012894:Sleep Stages; D011795:Surveys and Questionnaires; D055815:Young Adult
keywords: dentistry; electromyography; grind; insomnia; oral-facial pain; tooth