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Rhinitis and sinusitis were associated with sleep bruxism. Moreover, sleep bruxism was more prevalent among children whose mothers had a higher level of schooling and those with higher degrees of stress.

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Background/Aims Occlusal features may increase the risk of dental trauma. The aim of the present study was to evaluate the association between occlusal characteristics and the occurrence of dental trauma in preschool children. Materials and Methods A population‐based case‐control study was conducted with a representative sample of 200 children 3‐5 years of age enrolled at private and public preschools in the city of Diamantina, Brazil. The case and control groups were matched for gender, age and type of preschool (public or private) at a ratio of 1:1 (100 cases and 100 controls). Independent variables of interest to the study (occlusal characteristics) and potential confounders (sociodemographic characteristics, sucking habits and lip coverage) were investigated. Intra‐examiner and inter‐examiner kappa values were higher than 0.80 for all oral conditions evaluated. The SPSS 22.0 program was used to analyse the data. Descriptive and univariate analyses as well as simple and multiple logistic regression analyses were performed. Results The occlusal feature most strongly associated with trauma was anterior open bite (OR = 3.80; 95% CI: 1.42‐10.16). Maxillary anterior crowding (OR = 2.14, 95% CI: 1.00‐4.63) and overjet (OR = 1.12, 95% CI: 0.58‐2.17) were associated with the occurrence of trauma independently of the confounding variables (sociodemographic characteristics, sucking habits and lip coverage), but these variables lost their significance when adjusted for other types of malocclusion. Anterior open bite remained strongly associated with dental trauma, regardless of confounding variables and other types of malocclusion. Conclusion Anterior open bite was the main variable associated with dental trauma in the preschool children analysed independently of the confounding variables and the presence of other malocclusions.

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