Palatal Expander
A) An appliance used to widen the upper jaw. It corrects narrow upper jaw structures and crossbites. In combination with the Herbst appliance, the upper and lower expanders cover two back teeth with silver crowns.
B) When used alone or with a protraction facemask, the upper expander/bonded hyrax covers many of the back teeth.
C) When used alone or with a protraction facemask, the upper expander/bonded hyrax covers many of the back teeth.
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