An innovative approach to arch expansion, Oscars are 0.022 rectangular inconnel tubes soldered to the buccal aspect of the molar bands. Closed at the end to prevent a wire from penetrating the distal aspect of the tube, Oscars allow the practitioner to place brackets on incisors, and expand in the sagittal plane by putting an oversized archwire in the tubes. When tied into the brackets, Oscars work by utilizing NiTi coil springs, and expansion occurs via light, continuous forces. Elastic hooks provide added control of movement. When used in conjunction with an RPE expander, or lower “E” appliance, oscars are able to expand the arch bidimensionally.
