Self-reported awake bruxism and chronotype profile: a multicenter study on Brazilian, Portuguese and Italian dental students

Cranio. 2021 Mar;39(2):113-118. doi: 10.1080/08869634.2019.1587854. Epub 2019 Mar 25.


Objective: To assess the association between self-reported awake bruxism (AB) and the chronotype profile among Brazilian, Portuguese, and Italian dental students.Methods: A cross-sectional study involving 205 dental students was developed. Self-reported AB as well as information on sleep characteristics were collected from a questionnaire. The Morningness-Eveningness Questionnaire (MEQ) was used to measure the chronotype profile. Descriptive statistical analysis, the chi-square test, and univariate analysis were used to evaluate the factors associated with AB.Results: The prevalence of AB in all groups was 33.7%. The intermediate chronotype profile was the most prevalent (60.4%), and only 16.7% of the participants had the morning profile. The univariate analysis showed that older dental students (OR = 2.640, 95% CI 1.388-5.021) and those with the eveningness chronotype profile (OR = 3.370, 95% CI 1.302-8.725) are associated with AB.Discussion: Students over the age of 22 and those with the eveningness chronotype profile were prone to AB.

Keywords: Bruxism; chronobiology; cultural diversity; dental students; dentistry; sleep; wakefulness.

Publication types

  • Multicenter Study

MeSH terms

  • Brazil / epidemiology
  • Bruxism* / epidemiology
  • Circadian Rhythm
  • Cross-Sectional Studies
  • Humans
  • Italy / epidemiology
  • Portugal / epidemiology
  • Self Report
  • Students, Dental
  • Surveys and Questionnaires
  • Wakefulness*