Cephalometric comparison of the effectiveness of forsusFRD EZ2 and biobite corrector fixed functional appliancesin patients with mandibular retrognathia

The aim of this study is to compare the effects of Forsus FRD EZ2 (Forsus) and Biobite Corrector MS (BBC) fixed functional appliances by using cephalometric analysis in patients with mandibular retrognathia. Lateral Cephalometric radiographs of 41 patients who had the indication of mandibular retrognathia and had been treated with Forsus and BBC appliance in the archives of Gaziantep University Orthodontics Department were included in this study. Fixed functional appliances were kept activated in all cases until 1st molars came to class I relationship and hold in place for 6,3±1 months (Forsus) and 6,5±1 months (BBC). Lateral cephalometric radiographs were taken before installing the appliance (T1) and just after removal of the Forsus and BBC groups (T2). Lateral cephalometric radiographs of 21 patients treated with Forsus (mean age 15,57 ± 1,66) and 20 patients (mean age 15,79 ± 1,68) treated with BBC appliance were evaluated using Dolphin Imaging and Enlil programs. Subsequently, the data was evaluated with paired t-test, independent samples t-test in 95% confidence interval. As a result, Forsus and BBC appliances were found to be effective in overjet, overbite and molar relationship correction in patients with mandibular retrognathia, and the obtained effect was more dentoalveolar and the skeletal effect was minimal. At the end of the treatment, retrusion at the upper incisor teeth and protrusion at the lower incisor teeth were observed. The BBC appliance was found to cause less increase in IMPA than Forsus appliance. Key Words: Biobite Corrector, Cephalometric comparison, Class II malocclusion, Fixed functional appliances, Forsus FRD EZ2.