appliances have been reported in literature such as mandibular protraction appliance (MPA), 9 Jasper Jumper, 10 mandibular anterior repositioning appliance (MARA) 11 etc. AdvanSync was developed by Terry Dischinger (2010) in conjunction with Ormco TM as a treatment option for skeletal class II malocclusion. 12 The appliance was designed to advance the mandible to class I occlusion within 6-9 months, while allowing for simultaneous use of fixed orthodontic appliances. It has been shown that

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... beam computed tomography (CBCT) is an accurate and reliable method as it has an inherent advantages of shorter radiation exposure and reduced image distortion due to patient movements and increased efficiency. Hence, this study was designed to evaluate and compare the IntroductIon Orthodontics is always aimed at the treatment of malaligned teeth and restoring a beautiful smile with enhancing the occlusion both functionally and esthetically. The imbalance in harmony of face and occlusion is reflected through soft tissue drape which follows skeletal and dental architecture. Among a number of dental and skeletal combinations which can create a class II malocclusion, the mandibular retrusion is the most common characteristics found in these patients. According to McNamara, 1 most of the skeletal class II patients have mandibular deficiency and he suggested growth modifying treatment modalities to treat the jaw at fault. Treatment ranges from dental compensation which includes camouflage with extractions to surgical procedures aiming at moving the jaw at fault. If growth is remaining, growth modification can be considered as an intermediate treatment option. Skeletal class II correction by growth modification methods can be accomplished by either restriction of forward maxillary growth and promoting the forward mandibular growth leading to improvement in the anteroposterior jaw positioning. Pubertal growth spurt 2-5 (CS3-CS4 6 ) is considered as the best time for orthopedic class II correction using growth modification procedures. Fixed functional appliances have proven to be efficient and compliant in correcting the sagittal malocclusion in a relatively shorter treatment duration. Herbst, an original bite jumping appliance was developed by Emil Herbst 7 and later revisited by Hans Pancherz 8 in 1979. Since then, a number of other fixed functional