Influence of the practice of sports, sleep disorders and habits on probable sleep bruxism in children with mixed dentition.

OBJECTIVE Investigate the association between sleep disorders and probable sleep bruxism (SB) in children eight to ten years of age. METHODS A cross-sectional study was conducted with 739 schoolchildren in Brazil. Parents/guardians answered a sociodemographic questionnaire, the Sleep Disturbance Scale for Children and the Circadian Energy Scale. Parafunctional habits were evaluated using the Nordic Orofacial Test-Screening. Multivariate logistic regression was performed (α = 5%) and a directed acyclic graph was used in the statistical model. RESULTS The prevalence of probable SB was 9.1% and 58.6% of the children had sleep disorders. In the final model, having unmarried parents/guardians (OR = 1.98; 95% CI: 1.07-3.65), exhibiting parafunctional habits (OR = 2.02; CI: 1.01-4.06), not practicing sports (OR = 1.92; CI: 1.04-3.54), sleep-wake transition disorders (SWTD) (OR = 2.01; 95%CI: 1.12-3.62) and excessive daytime sleepiness (EDS) (OR= 2.17; 95%CI: 1.11-4.29) were significant associated with probable SB. CONCLUSION The occurrence of probable sleep bruxism was influenced by the marital status of the parents/guardians, parafunctional habits, the non-practice of sports, and sleep disturbance (SWTD and EDS) . This research contributes to the planning of public policies that include educational regimens at school to prevent sleep disorders and favor the reduction of sleep bruxism prevalence.