Dimensões dos arcos dentários na má oclusão Classe II, divisão 1, com deficiência mandibular

AIM: To determine the alterations of the upper and lower dental arches in the Class II, division 1, malocclusion with mandibular deficiency. METHODS: Cast models of 48 individuals with Class II, division 1, malocclusion, equally matched according to gender, as well as of 51 individuals (22 males and 29 females) with normal occlusion were analyzed. All 99 subjects were in the permanent dentition with the second molars either erupted or erupting. The ages of all subjects ranged from 11 years 4 months to 20 years (mean age = 12 years 5 months). CONCLUSION: We concluded that the upper dental arch is constricted and longer in the Class II, division 1, malocclusion with mandibular deficiency, while the lower arch is less influenced by Class II malocclusion.