Frankel's Functional Regulator is an activator particularly suitable in malocclusions of Class II at the age of growth. The Frankel use the natural growth spurt and shields from unwanted forces, to encourage the top and bottom jaw to develop a more naturalposition. Its has shields to remove unwanted forces from the cheeks and labial shields to relieve pressure from the lips.
Doctor Fränkel's appliances correct some abnormal functions (improper deglutition, buccal respiration, improper tongue position, weak lip seal) while enabling harmonious development of muscles and maxillaries. These appliances exert their forces on the vestibules, on which two vestibular screens part the buccal and labial muscles of the dentition (from 0.5 to 3mm). Pressure exerted on the maxillaries by the cheeks and lips is thereby eliminated. By this very fact, the tongue provides natural expansion of the dental arches. Indeed, these appliances first transmit their force into the development of the bone base, while above, the dental arches resume their proper positions on their own. In general, expansion gained with a Fränkel is maintained. In comparison with other orthopaedic appliances, risks of relapse are low.