INBDE (Integrated National Board Dental Examination) Practice Exam

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How do Hyrax and Haas appliances differ?

  1. Hyrax is softer than Haas

  2. Haas is used for younger patients

  3. Hyrax is anchored on teeth, Haas is on palate

  4. Haas provides more force than Hyrax

The correct answer is: Hyrax is anchored on teeth, Haas is on palate

Hyrax and Haas appliances are both types of palatal expanders used in orthodontics to widen the upper jaw. The key difference between the two is the way they are anchored in the mouth. The Hyrax appliance is anchored on the teeth using bands or crowns, while the Haas appliance is anchored on the palate (roof of the mouth). This difference in anchorage is essential in determining the correct answer.

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