Arch Development: Fixed Expanders
Fixed maxillary and mandibular expanders include a broad range of appliance designs. The designs are used to correct cross-bites, narrow arches and crowding. The fixed expanders utilize some mechanism of force (expansion screws, self-activating wire or wire activation) for development of the arch. These fixed designs require minimal patient compliance and provide the doctor with total control during active orthodontic treatment. Auxiliary attachments such as brackets and habit breakers can be requested for most of the expander appliances.
NiTi Expander
Porter W
Quad-Helix
Skeletal Expander
Williams
E-Arch
Slim-Line
The new slim-line palatal screw is used in cases requiring a physically smaller expansion screw. The screw allows for approximately 11mm of activation and more patient tongue space providing optimal patient comfort. It is ideal for cases needing lower arch development.
Super Screw
The Super Screw expander is used in situations that require a larger degree of arch development but a physically smaller screw is desired. A 12mm or 16mm screw can be requested. A special adjustment wrench is sent along with each appliance.
Memory Screw
The new line of memory screw expanders puts the control back in the clinician’s hands. Once the Memory screw is activated 4-to-5 turns the Niti coil springs that are built into the screw become active. The Niti coil springs then provide light continuous forces for biocompatible arch development. This new screw can be used in both fixed and removable appliance designs.
Fixed Fan Gear
The fixed fan gear appliance is the appliance of choice when presented with a tapered maxillary arch and a fixed appliance is required. The screw provides 9mm of activation.
