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Orthodontic technology is a specialty of
the orthodontic appliance are divided into three group:1)Removable Appliance 2)Removable Fixed Appliance 3)Fixed Appliance
There are three main types of orthodontic appliances: active, passive and functional. All these types can be fixed or removable.
An active appliance is a device used to apply forces to the teeth to change the relationship of the teeth.
Removable active appliances are intended for simple tipping movements. Use of removable appliances in modern orthodontics is much more limited than in the past due to their various shortcomings.