FOX VALLEY  Orthodontic Laboratory

Active Plates & Wire Devices for Expansion:



Mandibular Schwarz 


This removable appliance is used to upright and widen the posterior.  Fabricated with a transverse expansion screw embedded in the acrylic plate and a cuspid to cuspid labial bow, Adams clasps are used on the first molar.  Additional clasping between the bicuspids is optional, as well as occlusal coverage on the posterior teeth. 

Fan Schwarz 

fan schwarz  

Similar to the standard schwarz but utilizes a hinged screw to widen the anterior while maintaining molar width.

Nordnord uni-lateral expander


The Nord utilizes the same wire and screw components as a maxillary schwarz exept it is designed for unilateral expansion.  To achieve this the acrylic is cut from distal of the cuspid on the side requiring expansion to the midline then along the midline to the heel of the appliance.  With an indexed posterior bite plate to stabilize one side and a smooth posterior bite plate on the side intended for activation.



The transverse is very similar to the schwarz but designed with twin expansion screws for increased stability.  Included to remove occlusal interference are posterior bite plates, adams clasps on the first permanent molars and ball or arrow clasps between the bicuspids provide retention.  A labial bow is not normally used in this appliance but may be added


3-way sagittal

Crowding may be alleviated by the use of sagittal appliances.  Sagittal appliances move the anterior teeth forward or distalize the molars.  Adams clasps are on the first bicuspids and first molars.  Maxillary sagittals position twin expansion screws at the mesial of the first molar, the appliance is cut into 3 sections to allow for expansion.  The mandibular appliance positions the screws in the cuspid/bicuspid area.  A third midline screw may be added if transverse expansion is desired.  Springs may also be incorporated to move the canines into position as space becomes available.  Also acrylic coverage on the posterior teeth may be incorporated to relieve maxillary / mandibular occlusal contact during treatment.



The Jackson is a lower apliance used to upright posteriors and gain anterior space.  An 0.045" wire is formed into a U shape and is embedded into lingual posterior plates.  Two pair of ball or arrow clasps aid in retention and lingual anterior crossover springs are used to align the incisors.  This design allows for either greater expansion force in the first bicuspid area and limited molar expansion or greater molar expansion and limited bicuspid expansion depending on the case.  The spring action of this appliance allows for significant expansion from a single activation

"W" Expander Designs:

These appliances are very similar in design and function.  The body wire may be adjusted for expansion, molar rotation, fan type expansion, arch constriction and buccal root torque.

"W" Arch

The "W" Arch is the simplest of the "W" expander design appliances and may be used on the maxillary or mandibular arch.



The Porter is simply a removeable "W" Arch

Quad Helix

quad helix


This maxillary appliance is the same overall shape as the "W" Arch but with the inclusion of four helixes. Two at the subgingival areas distal to the molar bands and two at the anterior corners near the rugae.

Bi Helix


The Bi Helix is the mandibular version of the Quad Helix without the anterior helixes. © 2006 HomeAppliancesColors & EffectsPoliciesForms DeliveryContact

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