Which appliance is a functional appliance intended to influence jaw growth?

• A. twinblock appliance
• B. adams crib
• C. luxator
• D. fine bore aspirator

Answer: (A)

Functional appliances aim to change how the jaws develop by using the patient’s own jaw movements during function. The twinblock does this by guiding the lower jaw forward with two acrylic bite blocks that interact when the mouth closes. Because the mandible is held forward during chewing and other activities, the growth sites around the jaw respond, encouraging forward growth and helping to correct skeletal Class II patterns in growing patients. That orthopedic effect is what makes it suitable for influencing jaw growth rather than simply moving teeth.

The other options aren’t about guiding jaw development: an Adams crib is a habit‑breaking device used to deter thumb sucking; a luxator is a tool used to loosen teeth before extraction; a fine bore aspirator is a suction device used during procedures. These do not function to influence jaw growth.