Objective: This research aimed to evaluate the three-dimensional
effects of a Twin Block (TB) appliance on the pharyngeal airway
passage (PAP) in a sample of Class II patients with mandibular
retrusion using cone-beam computed tomography (CBCT).
functional treatment of skeletal class II malocclusion is one of the most
important treatment options in mixed dentition. The aim of this research is to evaluate the effectiveness of
two of the most popular functional appliances in daily orthodonti
c practice which are: Schwarz double
plate and twin block, and to compare the effectiveness of these appliances.