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Epidemiology and policy
P1-274 Prevalence and predisposing factors for malocclusion among Brazilian preschool children
  1. A Carvalho1,
  2. S Paiva1,
  3. C Viegas1,
  4. A Scarpelli1,
  5. F Ferreira1,2,
  6. I Pordeus1
  1. 1Federal University of Minas Gerais, Belo Horizonte, Brazil
  2. 2Federal University of Minas Gerais, Curitiba, Brazil


Introduction The aim of this study was to assess the prevalence of malocclusion in primary teeth and its predisposing factors.

Methods A randomised representative cross-sectional study was carried out in Belo Horizonte, Brazil, with 1069 preschool children between 60 and 71 months of age. A questionnaire addressing individual and behaviour characteristics of children was self-completed by parents. The oral examination was performed by a single dentist calibrated (κ≥0.82) for the diagnosis of the following types of malocclusions: posterior crossbite, overjet (>2 mm), anterior crossbite, anterior open bite and deep overbite. The chi-square and Fisher's exact tests were used, with the level of significance set at 5%. The study was approved by the Ethics Committee of the Federal University of Minas Gerais.

Results The overall prevalence of malocclusion was 46.2%. The specific prevalence of each malocclusion type was 13.1% for posterior crossbite, 10.5% for overjet, 6.7% for anterior crossbite, 7.9% for anterior open bite and 19.7% for deep overbite. No statistically significant associations were found between malocclusion and breast feeding, bottle feeding, pacifier sucking, finger sucking or nail biting (p>0.05). No statistically significant associations were found between malocclusion and the presence of these habits after 2 years of age (p>0.05). No statistically significant associations were found between malocclusion and parents' report of the occurrence of stuffy nose, open mouth, nose operation, throat operation or sinusitis (p>0.05).

Conclusion The prevalence of malocclusion was high, but the predisposing factors investigated were not associated to the presence of malocclusion.

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  • Funding Supported by FAPEMIG and CNPq.