Frankel appliance


Frankel appliance or Frankel Functional Regulator is an orthodontic functional appliance which was developed by Rolf Fränkel in 1950s. This appliance primarily focused on the modulation of neuromuscular activity in order to produce changes in jaw and teeth. The appliance was opposite to the Bionator appliance and Activator appliance.

History

It was developed by Rolf Fränkel in Germany in 1950s. In his practice, Fränkel had used the activator functional appliance and experienced mixed results with this appliance. He believed that a treatment outcome is more stable if the functional deviations of muscles are also corrected along with dentition. Therefore, through his work he developed an approach which allowed the maxillary and mandibular muscles to play an important part in an orthodontic treatment. He achieved that through development of functional regulator appliances. These appliances allowed him to train and reprogram the musculature around the mouth. He published around 70 articles which stressed the importance of his appliance in expanding the dental arches.
He first introduced his functional orthopedic approach in 1966 at a meeting for European Orthodontic Society.

Fränkel's Philosophy

Fränkel's philosophy mirrored that Melvin Moss. Their philosophy was that the functional performance of the muscular portions of the oral capsule influence the developing functional spaces. Fränkel also thought that the functional spaces are influenced by the atmospheric pressure. He believed that the perioral muscles had restraining effect on the dental arches and that the insertion of appliance expands the capsule and allows new functional adaptation of the muscle.

Types

Frankel Appliance I (FR 1)

This appliance had Type A, B and C. The difference between A and B was the lower lingual loops in one and lower lingual shield in another. This was mainly used for Class 1 and Class 2 Division 1 malocclusion.
This was used primarily in Class 2 Division 1 and 2.

Frankel Appliance III (FR III)

Used in patients with Class 3 malocclusion. In this appliance the lip pads are used in the maxillary arch to allow the maxilla to grow. The mandibular arch does not have pads in the anterior to allow the soft tissue forces to act on the mandible.

Frankel Appliance IV (FR IV)

Used in patients with open bite and bimaxillary protrusion cases.

Frankel Appliance V (FR V)

This appliance can be used with headgear in patients with high mandibular plane angle and vertical maxillary excess.

Modifications