The Hyrax (Hygienic Rapid Expander) Banded was originally designed as an upper arch, rapid palatal expanding appliance, but can also be used as a slow expander. Between three main designs (bonded, banded, and wire frame), a variety of available screws, and the option of reverse headgear hooks, there is certainly a design to meet any patient’s lateral expansion needs.

Expansion potential with the Hyrax ranges between 10-18mm, depending on the screw used. The traditional Hyrax screw expands at least 10mm and is widely used today. The “Super Screw” (shown right) can be used for expansion of up to 18mm, and the Memory screw offers spring-loaded expansion.