Sliding mechanics in extraction cases with a bidimensional approach.

The Bidimensional technique is an edgewise technique in which 2 different sized vertically slotted brackets are used. On the central and lateral incisors, .018" x .022" brackets are placed on the central and lateral incisors and .022" x .028" brackets are placed on the canines, molars and premolars. The maxillary incisor brackets are programmed. All movements, including bodily retraction of the maxillary incisors are produced by sliding mechanincs. When retracting maxillary incisors, an .018" x. 022" wire which fills the vertical portion of the brackets, providing torque control, is inserted and 300 gm intra arch forces are placed for incisor retraction. In the buccal segments, the .018" x .022" wire is undersized relative to the canine, premolar and molar brackets and can readily slide through the brackets and tubes. The method is described and illustrated with one case report of the extraction treatment of a patient with Class I bimaxillary protrusion.