Cephalometric study in patients that displayed Class II, division 1 malocclusion treated with herbst appliance

Ana Carla Raphaelli NAHÁS, José Fernando Castanha HENRIQUES, Guilherme JANSON, Bryan D. TOMPSON, Donald G. WOODSIDE

Objective: This study investigated the treatment effects on the craniofacial growth of Class II patients treated with Herbst appliance. Methodology: The sample was comprised of two groups, one experimental and one control group. The experimental group originated from Bauru Dental School, University of São Paulo. This consisted of 25 patients treated by the Herbst appliance, with an initial mean age of 12,01 years. The control group, matched by age with the experimental group, was originated from the Burlington Growth Centre, located at the Faculty of Dentistry, University of Toronto, Canada. All patients were assessed at the beginning (T1) and at the end of the treatment or observation period (T2) and 33 cephalometric variables were established. Results and Conclusions: The statistical comparison between the experimental group and the control group (Student t test) showed in shortterm fashion, the correction of the initial malocclusion with pronounced dental changes (loss anchorage). The effect in inhibiting the vertical development of the maxillary first molars, essential characteristic to correct the Class II molar relationship and to maintain the craniofacial growth pattern, was shown with the therapy.

Keywords: Classe II, division 1. Cephalometry. Herbst appliance.

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