Functional Appliance
A removable or fixed orthodontic device that harnesses the forces of orofacial muscles to modify jaw growth and correct skeletal discrepancies, primarily in growing patients.
Full Definition
Functional appliances are a class of orthodontic devices used predominantly during the pubertal growth spurt to redirect jaw development. Examples include the Twin Block, Clark's Twin Block, Herbst appliance, Bionator, and Frankel regulator. They work by posturing the mandible into a forward or corrected position, stimulating adaptive bone and condylar changes. The term 'functional appliance' is a broad category label and should be followed by the specific appliance name in clinical records. Editors should distinguish this from 'fixed appliance' (braces) and 'removable appliance' (used for minor tooth movements).
Usage
Usage note: Capitalise specific named appliances (e.g., Twin Block, Herbst) as proper nouns. 'Functional appliance' itself is lowercase. Always specify the appliance type in clinical documents.
In Context
- "A Twin Block functional appliance was fitted to address the patient's Class II skeletal discrepancy." — Treatment record
- "Functional appliance therapy was initiated at the peak of the pubertal growth spurt for maximum skeletal effect." — Orthodontic case presentation