The Frankel Appliance is a functional device that is used to help create additional space for permanent teeth to erupt by expanding the arches. This device stimulates growth of the lower jaw which will better align the upper and lower teeth. The Frankel Appliance can also be used to help with protrusion or overjet by retracting the upper teeth and creating a better bite. Their average lifespan have 18 – 24 months and possibly longer if the permanent teeth have not fully erupted. There are four types of Frankel appliances:
1. Frankel I – treats Class I and Class II Division 1 malocclusions.
2. Frankel II – treats Class II Division 2 malocclusions.
3. Frankel III – treatment of Class III malocclusions.
4. Frankel IV – used for open bites and bimaxillary protrusions.