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Cranio. 2019 Mar 25:1-6. doi: 10.1080/08869634.2019.1587854. [Epub ahead of print]

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

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a Department of Pediatric Dentistry and Orthodontics , Universidade Federal de Minas Gerais , Belo Horizonte , Brazil.
b School of Medicine , University of Coimbra , Coimbra , Portugal.
c Post Graduate School of Orthodontics , University of Ferrara , Ferrara , Italy.
d School of Dentistry , University of Siena , Siena , Italy.



To assess the association between self-reported awake bruxism (AB) and the chronotype profile among Brazilian, Portuguese, and Italian dental students.


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.


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.


Students over the age of 22 and those with the eveningness chronotype profile were prone to AB.


Bruxism; chronobiology; cultural diversity; dental students; dentistry; sleep; wakefulness

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