Endodontics · single question
A tooth has become discolored two years after trauma. What causes this discoloration?
Show answer and explanation
Correct answer: A. Breakdown products of red blood cells (hemoglobin/iron in dentin)
- A. Correct. Intrapulpal hemorrhage from trauma releases RBC breakdown products (hemoglobin → iron sulfide) that infiltrate dentinal tubules, darkening the crown.
- B. WBC breakdown is not the source of post-trauma tooth discoloration.
- C. Endotoxins relate to infection, not the chromogenic blood-breakdown staining.
- D. Tetracycline staining is developmental/drug-related, not trauma-induced.