Extraoral traction and class III treatment.

True Class III malocclusions are difficult to treat because they reflect basal bone discrepancies and there are many limitations to conventional treatment mechanisms. For example, Class III elastics may adversely affect the inclination of the occlusal plane and bite depth. On the other hand, extraoral appliances can be used advantageously. One important application is to move a retrognathically positioned maxilla forward orthopedically by means of the facial mask of Delaire. In addition, extraoral appliances placed against the lower incisor segment can also be used to retract the mandibular incisors and control bite depth during the retraction procedure.