HAAS
LATERAL EXPANSION (Fixed)
The Haas appliance is a tooth-tissue-borne alternative to the Hyrax appliance. Studies have indicated the Haas appliance with palatal acrylic will reduce the tipping effect on the teeth and provide a larger sutural displacement when used as a rapid expander, compared to the Hyrax. Clear acrylic is used on the occlusal with bonded versions (as shown below) to provide easy checks for leakage.
