The effect of inclined bite plane and modified FRII treatment on dentoskeletal changes in Cl II/I malocclusion

The prevalence of Cl II malocclusion is high in the population. The functional appliances are used in the patient who has mandibular deficiency. The present study was aimed to compare the dentoskeletal changes of CLII/I Malocclusion who used inclined anterior bite plan and modified FRII. The material consisted of 30 patients, with Cl II/I malocclusion, ANB > 4º in late mixed dentition. Half of the patients (9 girls and 6 boys) were treated by inclined anterior bite plane and reminder (8 girls and 7 boys) by modified FRII appliance. Lateral cephalogroms were obtained and traced before and after treatment and certain angular and linear variables were measured. The pretreatment and post-treatment measurements were compared using Mann-whitney U test and Wilcoxon Test to evaluate the significancy of the results. Significant changes mainly caused by mandibular growth, were observed after treatment by modified FRII and inclined anterior bite plane. This study indicated no statistical significant differences between two groups except Ar-B and AR-Pog. Considering the less bulky anterior inclined bite plane and its easier construction we can use this appliance instead of modified FRII.