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Cranio. 2018 May 9:1-6. doi: 10.1080/08869634.2018.1471113. [Epub ahead of print]

Possible sleep bruxism, circadian preference, and sleep-related characteristics and behaviors among dental students.

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a Department of Pediatric Dentistry and Orthodontics , Universidade Federal de Minas Gerais , Belo Horizonte , Brazil.



To assess sleep bruxism prevalence and its association with circadian preference and sleep-related characteristics among dental students.


Dental students of the Federal University of Minas Gerais participated in this cross-sectional study. Participants answered a scale assessing individuals' circadian preference, and a questionnaire regarding sleep-related characteristics and behaviors, history of muscle ache in the temporomandibular area, and history of bruxism.


One hundred fifty-two students participated in the study. Sleep bruxism was reported by 11.3%. Most students (63.2%) were classified as intermediary, 34.9% as morningness, and 1.3% as eveningness. Individuals who reported muscle ache in the temporomandibular area in the morning (PR = 3.5; 95% CI = 1.1-11.5) were more likely to be in the group with sleep bruxism.


Muscle ache in the temporomandibular area is an important associated factor with sleep bruxism among dental students. Special attention should be paid to dental students' circadian preference.


Bruxism; circadian clocks; circadian rhythm; dental students; sleep; sleep bruxism; sleep hygiene; temporomandibular joint

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