Which appliance is a removable expansion appliance?

• A. Hyrax Expander
• B. Nance Appliance
• C. Schwarz Appliance
• D. Forsus Springs

Answer: (C)

This question hinges on identifying a removable expansion device versus fixed appliances. The Schwarz appliance is a removable palatal plate with an expansion screw; it sits on the palate and is held in place by clasps, so the patient can remove it for eating or hygiene. That makes it the only option here that functions as an expansion device you can take out.

The Hyrax expander is fixed to the teeth with bands on the molars and a screw spanning between them, so it cannot be removed by the patient. The Nance appliance is also fixed, serving mainly as a space-maintainer or anchorage device rather than for active expansion. Forsus Springs are a fixed functional appliance used to correct bite relationships, not to widen the palate.