Introduction. Nowadays, obesity is an increasing problem in population of schoolchildren. It is connected with oral health, altered facial and stomatognathic system morphology and higher occurence of some ethiological factors leading to malocclusions. Aim. The aim of the study was to check the malocclusions prevalence in overweight/obese schoolchildren children with respect to chosen external ethiological factors as caries, dysfunctions and bad habits. Material and methods. The study was conducted on the group of 120 children aged from 7 to 15 years old, including 60 children with alimentary (simple) overweight and obesity, 26 girls and 34 boys (mean age 10 ± 10 months). The control group was composed of the same number of children adjusted by gender and age to the study sample. Extra and intraoral clinical trial and questionnaire were subjected to statistical analysis χ2. Results. All kind of malocclusions except vertical ones were found out more frequent in overweight children however without statistical difference. In ethiological factors analysis only breathing problems had statistically significant difference.

Key words: malocclusion, overweight, obesity, children.