Haas Expanders

This expander allows application of lateral force to the teeth and the walls of the palate. This is achieved by using an acrylic borne screw embedded in an acrylic plate. A split in the acrylic corresponding to the patient’s palatal midline widens as the screw is activated. Heavy wires embedded in the plate are soldered to bands and run along the lingual surfaces of the patient’s posterior teeth. The acrylic plate aids in achieving true lateral expansion rather than the outward tipping of the posterior teeth sometimes associated with expanders that only push against the teeth.

DURATION REQUIRED FROM LAB : 2 days

REQUIREMENT FOR LAB : Upper and lower( type 3) dental stone models without voids made from good alginate impression