HAAS Palatal Separator

The HAAS Palatal Separator is a fixed orthodontic appliance used for rapid maxillary expansion (RME), designed to correct transverse discrepancies such as a narrow upper jaw or posterior crossbite. It features a central expansion screw embedded within an acrylic body that contacts the palatal mucosa, and it is cemented to the upper molars and premolars via metal bands.

Unlike all-metal expanders, the HAAS design transmits force to both the teeth and the mid-palatal suture via the palatal acrylic, promoting skeletal expansion in growing patients. The appliance is typically activated daily under orthodontist supervision and is highly effective during the mixed dentition phase.