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BACKGROUND Class II is one of the most common malocclusions. The prevailing aspect in Class II patients is a mandibular deficiency. Various removable and fixed functional therapies are used in order to enhance the mandibular growth or position. The aim of this prospectively controlled study was to evaluate long-term dentoskeletal changes obtained by a functional appliance for Class II. METHODS Prospective controlled study, based on a sample size calculation. 26 Class II Divi- sion 1 patients (11.8 ± 1.5 years) were consecutively treated with the P