Restorative & Materials · single question
Which radiopacifier added to endodontic/restorative materials (e.g., MTA) is most associated with causing tooth discoloration/staining?
Show answer and explanation
Correct answer: A. Bismuth oxide
- A. Correct. Bismuth oxide, the radiopacifier in traditional gray/white MTA, reacts with dentin collagen and blood and discolors the tooth.
- B. Tantalum is a radiopacifier not characteristically linked to crown staining.
- C. Calcium compounds provide bioactivity, not the staining seen with bismuth.
- D. Zirconium oxide is used as a non-staining radiopacifier alternative precisely to avoid bismuth discoloration.
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