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Expansion / Distalizing
Specialty Appliances fabricates a wide range of fixed expansion and molar distalization appliances. We offer all metal as well as metal/acrylic combination designs for arch development. Specialty also offers our "Indirect Banding" service for any appliances requiring bands or crowns.

Upper Screw Expansion

Upper RPE

The RPE is an all-metal appliance with an expansion screw soldered to bands on the first molars. The standard design has .045-inch lingual support bars placed from the bicuspids to the first molars. Specialty Appliances' standard is a 12-millimeter expansion screw. [ View More Info ]

Upper Mini

The Mini Expander uses the first molars for anchorage and has .045-inch support arms extending to the first bicuspids. Like the traditional RPE, the Mini Expander has 12-millimeter expansion capability. The Mini Expander is the most popular expansion device made at Specialty. [ View More Info ]


The Exspider is 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 enough 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-millimeter expansion. [ View More Info ]

Lower Screw Expansion

Lower Fixed

A 12-millimeter reduced body expansion screw is soldered to bands on the first molars. The screw has a .059-inch lingual support wire giving added support and durability for lower arch development. Rests are generally soldered from the expansion screw to the first bicuspids. [ View More Info ]

Crowned Expander

The Dischinger Crown Expander uses crowns on the first molars for anchorage. The crowns supply anchorage and slightly open the bite to help expansion. The 12-millimeter Mini Palex is standard activation screw. The crowns can be placed on the deciduous second molars if the first molars are not erupted. [ View More Info ]

JI Williams

The JI Williams uses tubing on the lingual surface of the lower posterior teeth. A .016-inch round Ni-Ti wire is placed in the tubing to keep the lower anterior teeth rounded and inclined. An 8-millimeter expansion screw is soldered to tubing at the first bicuspid area. Rests are soldered from the tubing to the second bicuspids or second deciduous molars. [ View More Info ]

Acrylic Expansion

Deluke Contoured Expander

The DeLuke Bonded Rapid Palatal Expander can be made on permanent or mixed dentition. A 12-millimeter screw is typically used for maximum expansion. The screw legs are soldered to a wire framework anchored in the acrylic. The occlusal surface is balanced against the lower posterior teeth. [ View More Info ]


The Haas design 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. [ View More Info ]

Bonded RPE: Full Palate

The Full Palate Bonded Expander uses acrylic bonded to the first and second bicuspids and the first molars for anchorage. The acrylic extends across the palate area for bodily expansion. A 12 millimeter screw is used for maximum expansion. To aid in the removal of the appliance, debonding loops and/or debonding screws may be added. [ View More Info ]

Wire Expansion

Upper Quad Helix

The Fixed Quad Helix is attached to the first molars on either the upper or lower arch. The .036-inch stainless steel wire is contoured to the arch with 4 helical loops to help stimulate expansion. The sweep arms are contoured to the gingival of the bicuspids and cuspids. The lingual extensions can be extended to the anterior teeth if desired. [ View More Info ]


The E-Arch was originally designed by Dr. Angle. The E-Arch is one of the oldest designs for arch development still in use today. The appliance uses a pin and tube in the anterior region of the arch. An open coil spring is added for activation of the pin and tube. Once the appliance is inserted in the mouth, activation begans immediately. [ View More Info ]


The "W" arch or Porter arch uses a 0.36-inch stainless steel wire for expansion. The wire is soldered to bands on the upper first molars. The appliance can be constructed as a fixed removable that slides into sheaths on the upper first molar bands. Unilateral expansion can be achieved with proper activation. [ View More Info ]



The Pendulum has a Nance button and occlusal rests on the first and second premolars for anchorage. The springs are preactivated in the laboratory for easier insertion by the clinician. If the second molars are fully erupted, it is recommended that these be distalized first in order to achieve maximum efficiency in molar distalization. [ View More Info ]


The Pendex is like the Pendulum apart from an expansion screw used for transverse expansion and molar distalization. This results in greater overall arch development with the appliance. If the second molars are fully erupted, it is recommended that these be distalized first to achieve maximum efficiency in molar distalization. [ View More Info ]


The T-Rex is a modification of the Pendex and includes a .032-inch stainless steel T-Rex wires soldered to the mesial-lingual of the first molar bands. The appliance is inserted as a unit and gives greater expansion of the molars during treatment. The springs are pre-activated for easier insertion. [ View More Info ]

Other Molar Distalization

Rapid Molar Distalizer

The Rapid Molar Distalizer provides molar distalization without tipping the molars. This is done by placing small expansion screws on the buccal of the arch. The screws do not interfere with speech. Anchorage is achieved with an oversized Nance button in the anterior of the palate. [ View More Info ]

Distal Jet

The Distal Jet uses compressed coil springs that can be reactivated during treatment for distalizing the molars. The appliance can be bilaterally or unilaterally on the upper arch. The activation springs can be changed out during treatment if necessary for additional molar movement. [ View More Info ]

Horseshoe Jet

The Horseshoe Jet is a distalization appliance that relies upon palatal mini-screws for anchorage. This pure skeletal anchorage eliminates reliance upon dental and palatal vault support and any attendant anchorage loss. This design still benefits from forces that are applied, through a couple, closer to the center of resistance of the molars. [ View More Info ]

Bands & Crowns

Indirect Crown/Band Fitting

Specialty fits bands or crowns with our "indirect" service on your working model at a high degree of accuracy taking into consideration the anatomy of each tooth plus the path of insertion of the entire appliance. Using this service saves your office an extra appointment by eliminating the band fitting.

Digital Band Sizing

On digital cases we have developed a unique software process that isolates the target tooth receiving the band or crown. We are then able to digitally check each crown/band back on the original scan. The next step is to seat the crown/band on the printed model to double check accuracy.

Crimping Stainless Steel Crowns

Any Specialty expansion or distalizing appliance can be fabricated using our ROC crowns. As part of our lab process, the bottoms of the ROC crowns are "crimped" to provide mechanical retention in the mouth; yet another feature that sets Specialty Appliances apart from competitors.

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4905 Hammond Industrial Drive
Suite J
Cumming, Georgia 30041

Phone: 678-513-4408
Toll Free: 1-800-522-4636
Fax: 678-513-7345

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