Comparative study of the treatment effects of Class II division 1 malocclusion with the appliances Jasper Jumper and Bionator, associated with fixed appliances / Estudo comparativo dos efeitos do tratamento da má oclusão de Classe II, 1ª divisão com os aparelhos Jasper Jumper e Bionator, associados ao aparelho fixo

AUTOR(ES)

Leniana Santos Neves

DATA DE PUBLICAÇÃO

2007

RESUMO

This study compared the treatment effects of Class II division 1 malocclusion with the appliances Jasper Jumper and Bionator, associated with fixed appliances. The study sample was composed of 77 young individuals, divided into three groups: Study Group 1, comprising 25 patients with initial mean age of 12.72 years, treated with the Jasper Jumper appliance associated with fixed appliances for a mean period of 2.15 years; Study Group 2, composed of 30 patients with initial mean age of 11.31 years, treated with the Bionator and fixed appliances, with a mean treatment time of 3.92 years; and the Control Group, including 22 young individuals, with initial mean age of 12.67 years and followed for a mean period of 2.13 years. The initial and final lateral cephalograms of individuals in the three groups were evaluated. The cephalometric dentoskeletal variables were compared among groups at the initial and final periods by analysis of variance. The changes of all cephalometric variables in the Bionator group were annualized and compared to the changes observed for the other groups. It was observed that both treatments presented a restrictive effect on the maxilla and did not change the mandibular development. Treatment with the Jasper Jumper appliance produced clockwise mandibular rotation, increase in lower anterior facial height, and smaller counterclockwise rotation of the functional occlusal plane compared to treatment with Bionator. The maxillary incisors were retruded in the study groups and extruded in the Jasper Jumper group, which also exhibited distalization of maxillary molars. The mandibular incisors presented protrusion and buccal tipping in the group treated with the Bionator appliance and a tendency to protrusion and relative intrusion in individuals treated with the Jasper Jumper appliance. The mandibular molars exhibited extrusion in both study groups and mesial movement in the Jasper Jumper group. Both appliances allowed significant improvement of overjet, overbite and molar relationship.

ASSUNTO(S)

activator appliances corrective orthodontics angle class ii malocclusion aparelhos ativadores maloclusão de angle classe ii ortodontia corretiva

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