INBDE (Integrated National Board Dental Examination) Practice Exam

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Which of the following is the most likely cause of pulpal necrosis following trauma to a tooth?

  1. Ankylosis

  2. Calcific metamorphosis

  3. Pulpal hyperemia

  4. Dilaceration

The correct answer is: Pulpal hyperemia

Pulpal necrosis is the death of the living tissue inside the tooth, known as the pulp. This can occur following trauma to the tooth, which can disrupt the blood supply and compromise the health of the pulp. Out of the given choices, A, B, and D are not related to trauma and therefore not likely to cause pulpal necrosis. Ankylosis is when the tooth becomes fused to the bone, Calcific metamorphosis is a change in the structure of the tooth, and Dilaceration is a developmental abnormality. Therefore, the most likely cause of pulpal necrosis following trauma is pulpal hyperemia, which is an increase in blood flow to the pulp in response to injury.