Treatment effects of R-appliance and Anterior Inclined Bite Plate in Class II, Division I malocclusion

objectives: the purpose of this study was to compare the effects of a differently designed functional appliance (r-appliance) and the anterior inclined bite plate (aibp) in class ii division i (cl ii div i) cases. material and methods: fifty patients (28 girls, 22 boys) were chosen for the study: 25 patients (13 girls, 12 boys) with mean age of 10.4±0.8 years were treated with r-appliance for 11±2 months, the other 25 patients (15 girls, 10 boys) with mean age of 9±1.2 years were treated with aibp for 10±2 months. all patients had cl ii div i malocclusion due to mandibular deficiency. lateral cephalograms were analyzed at the beginning (t1, t 1) and end of the study (t2, t 2). results: paired t-test showed that snb had a significant increase in both groups. the same test revealed that impa was reduced in r-appliance for 3.1±4.7 (p<0.01), but it was increased for 0.1±5.1 (p<0.9) in aibp group. t-test showed that the inter-group difference of impa was statistically significant (p<0.05). sna showed an increase in both groups (p<0.9). ar-b and ar-pog showed an increase in both groups and the differences between them were statistically significant. conclusions: mandibular advancement was achieved in both groups, but r-appliance achieved this result without lingual tipping of lower incisors.