FR-Ⅱ Functional Appliance Treatment Of ClassⅡ Malocclusion With Mandibular Retrognathism And Lip Sucking Habit

Objective: To evaluate the effects of FR-Ⅱfunctional appliance during the treatment of Mandibular retrognathism Angle′sⅡgrowing patient with lip sucking habit.Methods: FR-Ⅱfunctional appliance was applied for a growing patient with Mandibular retrognathism Angle′sⅡmalocclusion and lip sucking habit. Comparion of the pre - post treatment cephalometric radiograph had been done after FR-Ⅱfunctional appliance was applied for the patient.Results: The results demonstrated that after 15 month treatment , lip sucking habit was eliminated .During treatment, B point moved forward ,deep overbite and overlap was corrected.Conclusion:FR-Ⅱfunctional appliance can effectively eliminate lip sucking habit,produce greater mandibular growth development,reduce skeletal disharmony and improve facial profile.