The aim of this research is to evaluate the treatment results of Class II, Division 1 cases whom were treated by Frankel's function regulator (FR -1b). Ten orthodontic patients participated to this research Class II, Division 1 malocclusion was present on all of our patients. On the other hand another group consisting of ten individuals who have Class II, Division 1 malocclusion were chosen as control group. The lateral cephalometric radiographs were obtained at the treatment group before and after the treatment. For the control group same radiographs were obtained at the begining and 2 years later. As a results we found out that the orthopedic effects of Frankel appliance is limited on both upper and lower jaw. Appliance basically affects the dento-alveolar structures.

Keywords: Class II, Division 1 Malocclusion, Frankel's Function Regulator