The Frankel appliances are removable designs invented by Professor Rolf Frankel. The Frankel philosophy uses the vestibules to enhance favorable growth in developing dentition and restrict undesirable muscle forces. Thus, the Frankel appliance is reported to provide an “ideal” environment for maximum arch development and proper skeletal jaw relationship. The three most commonly used designs are the Frankel II, Frankel III and Frankel IV.
Frankel II Pictured