INBDE (Integrated National Board Dental Examination) Practice Exam

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Sharp transient first pain is carried by what type of fibers?

  1. B fibers

  2. C fibers

  3. A delta

  4. A beta

The correct answer is: A delta

C fibers carry slow, dull, and aching pain, making them incorrect for sharp transient first pain. A beta fibers do not carry any pain signals, including sharp pain. B fibers are incorrect because they carry cold and pressure sensations. A delta fibers are the only remaining option and are therefore the correct type of fiber for carrying sharp transient first pain. These fibers are myelinated and conduct pain signals at a moderate speed, making them perfect for quick, sharp pain signals.

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