Functional appliances are used for decades in Class II therapy, but they are still the subject of many studies. Aim of this research was to determine dental arch size and form changes during orthodontic treatment using functional appliances. The study sample included patients presenting dental Class II/1 and Class II/2. in treatment (Activator or Bionator) for more than two years.
All dental models were scanned and digitized using ATOS system (GOM Germany). Referent points were located and automatically determined in 3D coordinate system
Statistical analysis using parametric methods, bifactorial and monofactorial analyses of variance were performed. 3D Dental arch form changes were determined.