The tip-edge concept: eliminating unnecessary anchorage strain.

The difficulty of managing this reverse anchorage potential has led to an increase in the use of extraoral forces, functional appliances, and even orthognathic surgery to correct malocclusions with relatively slight sagittal discrepancies. In his last published article, Angle advocated angulated bracket placement that would tip the crowns of the maxillary teeth distally to correct a Class II, division 1 malocclusion (Fig. 1). These angulations are the opposite of those found in today's preadjusted appliances, but they never gained widespread acceptance because of the need to remove and resolder the brackets at different angulations for finishing.