Activator:
This appliance is worn 10-14 hrs/day to enhance mandibular forward growth using the maxilla as an anchorage
Headgear:
The function of this appliance is to restrain maxillary forward growth and to distalize maxillary teeth. It is worn 10-14 hrs/day
Reverse pull headgear:
The opposite effect is obtained with this appliance which is worn 10-2 hrs/day. It enhances maxillary forward growth
Palatal expander:
This fixed appliance is very often used to widen the maxilla in order to correct a crossbite and to gain space for the permanent teeth
