Aim. The aim of the study was to access BMI parameter of orthodontically treated children with acquired malocclusion and children with congenital craniofacial abnormalities. Material and Methods. The data were obtained from the dental records of 82 patients age between 7–14 years, which were divided into two groups: 43 children with acquired malocclusion and 39 with congenital craniofacial abnormalities. The analysis of medical record of each patient allowed to calculate the BMI index and estimate percentile read from BMI‑for‑age percentile growth chart. The obtained values were compared with values between groups of children with acquired and congenital malocclusion taking also into account gender, place of living and the type of malocclusion. Results. The analysis carried out, showed no difference in BMI percentile values between children with acquired malocclusion and congenital craniofacial abnormalities and also between the rest of the values analysed in the study. Conclusions. Acquired malocclusion and congenital craniofacial abnormalities did not appear to have an influence on BMI percentile at the patients undergoing orthodontic treatment.

Key words: BMI, growth chart, congenital craniofacial abnormalities.