A Functional Removable Appliance is most often comprised of highly polished acrylic shields and stainless steel wires. It is a single piece and is often described as “two connected retainers”. This appliance is most often prescribed for patients with more pronounced Class II jaw discrepancies (upper-jaw forward and lower-jaw backward) or Open Bite problems (front jaws/teeth are apart and do not meet). Each appliance is fabricated as a custom fit with buccal shields (side acrylic pieces) and other components to modify growth in all planes of space. These types of appliances work comfortably with a patient’s inherent growth to affect the desired changes in skeletal/dental development.
