Three-Dimensional Assessment of Dentoskeletal Changes Associated With a Modified Twin Block Appliance for Treatment of Skeletal Class II Growing Patients With Mandibular Deficiency: A Randomized Clinical Trial

Twin block appliance is the gold standard for the treatment of skeletal class II patients with deficient mandible. Yet, it has some drawbacks as proclination of the mandibular incisors, development of posterior open bite and the unesthetic appearance. Many modifications in twin block A new design were made to overcome the previous problems, as adding incisor capping, Clasps, sagittal blocks, and esthetic twin block appliances. In the current trial A new design of esthetic twin block appliance with sagittal blocks is investigated and the post treatment skeletal, dental, and soft tissue, TMJ, and upper airway size will be assessed and compared to the changes associated with the conventional design of twin block. Moreover, patient satisfaction with the appliance will be assessed with both appliances.