Association of Class II Division 2 malocclusion with dental development anomalies

Aim: The aim of this study is to investigate the existence of an association between Class II Division 2 malocclusion and some dental development anomalies. Materials and methods: Using the initial orthodontic records, 137 Class II Division 2 malocclusions were examined. For each patient, the presence of the following dental development anomalies was determined: tooth impaction, tooth agenesis, upper lateral incisor microdontia, tooth transpositions and supernumerary teeth. Results: 57,7% of patients were diagnosed with at least one of the dental anomalies studied. In the total sample the prevalence rates were determined as follows: 20,4% of palatal maxillary canine impaction, 27,6% of third molar agenesis, 9,5% of upper lateral incisor agenesis, 37,0% of total tooth agenesis and 13,9% of upper lateral incisor microdontia. No tooth transpositions or supernumerary teeth were found in any patient. Conclusions: By comparing our results with prevalence studies of the dental anomalies studied in the general population, we can conclude that palatal maxillary canine impaction, tooth agenesis and upper lateral incisor microdontia are strongly associated with Class II Division 2 malocclusion. (C) 2012 Sociedade Portuguesa de Estomatologia e Medicina Dentaria. Published by Elsevier Espana, S.L. All rights reserved.