R-appliance: a different design in functional therapy in Class II Division I malocclusion.

Unlabelled: The aim of this study was to compare the effects of a differently designed functional appliance (R-appliance) with control group in Class II Division I (Cl II Div I) cases.

Methods: 18 girls treated with R-Appliance were selected as the experimental group. The control group consisted of 20 untreated girls. All of the patients had Cl II Div I malocclusion due to mandibular deficiency. Lateral cephalograms were analyzed at the beginning (T'1, T'2) and end of the study (T'1, T2).

Results And Conclusions: Increase of IMPA and reduction of SNA are two prevalent side effects of most functional appliances; however, results of this study showed SNA and IMPA had no significant changes in experimental group in comparison with the control group.