What characteristic is indicative of pulpal necrosis?

• A. Vital tooth response to pulp tests
• B. Gray discoloration of the crown
• C. Positive percussion test
• D. Symptoms of periapical pain

Answer: (B)

The characteristic indicative of pulpal necrosis is the gray discoloration of the crown. When pulp tissue becomes necrotic, it may lead to a change in the coloration of the tooth. The necrotic tissue can result in a darkening effect that manifests as gray or even black discoloration of the crown. This change often occurs as a result of the breakdown of blood supplies to the pulp, which can affect the appearance of the tooth.

In terms of tooth vitality, a vital tooth would respond positively to pulp tests, indicating that the pulp is healthy and functioning – this feature would not suggest necrosis. Similarly, a positive percussion test typically points to a tooth that is sensitive and likely healthy, rather than necrotic. Lastly, while symptoms of periapical pain can be associated with necrosis, they are not definitive indicators on their own, as such symptoms could also suggest pulpitis or other dental issues. Therefore, gray discoloration stands out as a specific and visual sign of pulpal necrosis.