Cephalometric comparative study of dental-skeletal changes of two-phase treatment (Herbst and pre-ajusted fixed appliance) in adolescents with Class II, division 1 malocclusion and mandibular retrognathism. / Estudo comparativo cefalométrico das mudanças dento-esqueléticas observadas nas duas fases do tratamento (Herbst e aparelho ortodôntico fixo pré-ajustado) de adolescentes com má oclusão de Classe II, divisão 1a e retrognatismo mandibular.

AUTOR(ES)

Fábio de Abreu Vigorito

DATA DE PUBLICAÇÃO

2007

RESUMO

This prospective study assessed the dento-skeletal changes of two-phases treatment of Angle Class II, division 1 malocclusion with mandibular retrognathism, realized in two phases of 12 months each (Phase I: Herbst appliance, Phase II: pre-adjusted fixed appliance). The cephalo-lateral radiographs, of 20 consecutively adolescents taken at three different times (T1: outset of treatment, T2: after the Phase I of treatment with Herbst appliance and T3: twelve months post-Herbst treatment), were measured manually according to Pancherz?s method and evaluated statistically. The results exhibited that from T1 to T2 both maxilla and mandible grew forward, although with major increments in the mandible, allowing a sagittal skeletal adjustment. The upper incisors retroclined and the lower incisors proclined; the upper molars moved distally and the lower molars moved mesially and the overjet decreased. The T2-T3 outcomes revealed forward movement of the maxilla and mild mandibular increases. The upper incisors? inclination did not change and the lower incisors retroclined, the upper and lower molars moved mesially and the overjet had a small increase. The T1-T3 results showed correction of the malocclusion with improvement of the dental and skeletal relationship. Based on these results it can be concluded that the changes characterized differently each phase of the treatment: during Phase I there were larger increase of mandibular growth and dental changes that overcorrected the malocclusion. The partial relapse observed in Phase II of treatment did not jeopardize the ideal goals of the treatment. The facial type was preserved.

ASSUNTO(S)

herbst appliance aparelho de herbst cephalometry mandibular retrognathism má oclusão de classe ii divisão 1a cefalometria retrognatismo mandibular class ii division 1 malocclusion

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