Polysomnographic study of the prevalence of sleep bruxism in a population sample

J Dent Res. 2013 Jul;92(7 Suppl):97S-103S. doi: 10.1177/0022034513484328. Epub 2013 May 20.


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.

Trial registration: ClinicalTrials.gov NCT00596713.

Keywords: dentistry; electromyography; grind; insomnia; oral-facial pain; tooth.

Publication types

  • Clinical Trial
  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Body Mass Index
  • Body Weight
  • Educational Status
  • Electromyography / statistics & numerical data
  • Humans
  • Middle Aged
  • Obesity / epidemiology
  • Overweight / epidemiology
  • Polysomnography / statistics & numerical data*
  • Population Surveillance
  • Prevalence
  • Sleep Bruxism / epidemiology*
  • Sleep Initiation and Maintenance Disorders / epidemiology
  • Sleep Stages
  • Surveys and Questionnaires
  • Young Adult

Associated data

  • ClinicalTrials.gov/NCT00596713