Schwarz vs Haas vs Hyrax: Choosing the Right Expansion Appliance

Schwarz: removable split acrylic baseplate with midline screw, slow expansion at 0.25mm per quarter-turn. Haas: acrylic-covered palate delivering force to both teeth and palatal bone. Hyrax: banded cemented expander with daily activation of 0.5-1.0mm for rapid maxillary expansion. Key selection criterion: skeletal vs dental expansion needs, patient age, and compliance considerations.