Active Removable Appliances Arch Development Schwartz A variety of active appliances can be fabricated for arch width and arch length development. Active designs are beneficial for development of the arches prior to fixed treatment. A minimum of four clasps is suggested to maximize retention. In addition to our standard designs; springs, small expansion screws and wires provide forces to move individual teeth.   Nord A Maxillary appliance, designed for the correction of unilateral cross bites. click for larger view   Three Way Used in the upper arch for both lateral and anterior development. click for larger view     Schwartz Upper and Lower Designed to gain lateral arch develpment in the upper and /or lower arches. click for larger view   Fan Gear Designed to develop the bicuspid area, it is ideal for correcting tapered arch forms. click for larger view