Evaluation of dental and facial changes after treatment of class II malocclusion patients with two types of fixed functional appliances (FFAs)

Objective: The objective of this study was to compare effects on soft tissue profile and dentoalveolar changes in class II patients after treatment with either Herbst appliance or Korn mandibular advancer as fixed functional appliances. Materials and methods of study: The sample of study consisted of (30) patients divided into two groups (G1):group one included (15) patients was treated by Korn mandibular advancer appliance, and (G2): group two included (15) patients was treated by Herbst appliance. In both groups fixed functional appliances were applied concurrently with fixed orthodontic appliance. Lateral cephalograms were taken and analyzed before treatment and after treatment. Statistical analyses were used to analyze data by (Kolmogorov smirnov, K-S) and student's t tests. Statistical significance was set at P