Treatment of Class II Malocclusion With Excessive Overjet

Participants (children, 9 years of age) are recruited at the orthodontic specialist clinic in Norrköping, Sweden. After informed consent participants are randomized into Group 1, 2 or 3. After randomization and registration, treatment with HGA is initiated for Group 1. Group 2 and 3 serves as untreated control group. Two years after registration, Group 2 starts treatment with HGA at the age of eleven. Group 3 serves as untreated control group to treatment with HGA. Four years after registration, Group 3 starts treatment with FA (3M Victory brackets, .022 slot size, McLaughlin-Bennet-Trevesi prescription). The patients in group 1 and 2 in need of a second phase of orthodontic treatment are treated with FA (3M Victory brackets, .022 slot size, McLaughlin-Bennet-Trevesi prescription) in early adolescence. The following registrations are made: Study models, photographs (extraoral, intraoral), Lateral head radiographs (T0, T2, T5, if required T1, T3), Child perceptions questionnaire. T0: After randomization; before treatment start (Group 1), registration/control (Group 2,3). T1: Two years after T0; after finished treatment for (Group 1), before treatment start (Group 2), control/registration for (Group 3). T2: Two years after T1; follow up (Group 1), after finished treatment (Group 2), before treatment start (Group 3). T3: Approx two years after T2 for patients not undergoing treatment with FA. For patients treated with FA, when treatment is finished. T4: Approx two years after T3- follow up. T5: Approx 8-10 years after T0 (Long term follow-up)