Abstract
summary Treatment effects of the Bionator functional appliance were studied on the pre‐ and post‐treatment cephalograms of 49 Class II, Division 1 cases. After treatment, a significant more ventral localization of the anterior structures of the mandible was recorded in comparison with the pretreatment situation. The proclination of the maxillary incisors was reduced. No absolute inhibitory effect on maxillary growth was observed. In this study no significant differences in the measured treatment effects on cephalometric radiographs could be demonstrated in cases with a tendency to skeletal open bite from those with a tendency to skeletal deep bite according to the criteria used in this study
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