INBDE (Integrated National Board Dental Examination) Practice Exam

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What type of appliance is a Hyrax?

  1. Mandibular advancement device

  2. Palatal expander

  3. Class 2 corrector

  4. Molar distalizer

The correct answer is: Palatal expander

The appliance known as a Hyrax is a type of palatal expander. This device is used to expand the upper jaw in order to correct a narrow palate. A mandibular advancement device, on the other hand, is used to move the lower jaw forward to correct certain bite issues. A class 2 corrector is a type of headgear used to correct an overbite. A molar distalizer is used to move molars backwards in the mouth. Therefore, while these options may also be used in orthodontic treatment, they are not the specific type of appliance known as a Hyrax.