Activator Appliances Appointments and Schedules Child Cost of Illness Costs and Cost Analysis Dentition, Mixed Female Health Care Costs Humans Male Malocclusion, Angle Class II Orthodontic Appliances, Functional Orthodontic Appliances, Removable Orthodontics, Corrective Overbite Prospective Studies Retreatment Sweden Treatment Outcome child clinical trial controlled study cost cost of illness devices economics female functional orthodontic appliance health care cost hospital management