Sending Us a Case

Find out what the lab needs to make your metal appliance.


The RPE is an all-metal appliance with an expansion screw soldered to bands on the first molars. The standard design has .045 lingual support bars placed from the bicuspids to the first molars. Specialty Appliances' standard is a 12 millimeter expansion screw placed in the second bicuspid area for easier activation. For smaller arches 7, 8, 9 and 10 millimeter screws are available.

Mini Expander

The Mini Expander uses the first molars for anchorage and has .045 support arms extending to the first bicuspids. Similar to the traditional RPE, the Mini Expander has 12 millimeters of expansion capability. With a highly visible activation hole, expansion has never been easier. The Mini Expander is the most popular expansion device made at Specialty.

Haas Expander

The Haas design (per Dr. A. J. Haas) incorporates palatal acrylic on each side of the upper vault with a 13.5 millimeter expansion screw soldered to bands on the first molars. Positive pressure is exerted evenly on the palatal tissue and teeth with this design. A 9 millimeter screw is utilized for a constricted arch.


The Exspiderâ„¢ expander is a fan type expander activated in the anterior segment and hinged in the molar area. The appliance is usually anchored to first molars bands and is ideal for the patient with sufficient molar width and a tapered arch. It can also be used in some cleft palate patients with sufficient room for the screw. The screw is capable of 9 millimeters of expansion.

Dischinger Crown Expander

The Dischinger Crowned Expander uses crowns on the first molars for anchorage. The crowns supply superior anchorage and slightly open the bite to aid in expansion. The 12 millimeter Mini Palex is our standard activation screw. The crowns can be placed on the deciduous second molars if the first molars are not sufficiently erupted.

RMD with Expansion

The Rapid Molar Distalizer provides accurate and predictable molar distalization without tipping the molars. Small expansion screws are placed on the buccal of the arch and will not interfere with the speech or swallow patterns of the patient. An oversized Nance button provides an anchorage point in the anterior palate and bands on the first bicuspids and first molars help secure the appliance. The first bicuspids will follow the first molars down the alveolar process. For patients with fully erupted second molars, the appliance is anchored to the second molars and the second bicuspids. In this case the second bicuspids will follow the second molars down the alveolar process.