Question 50 · LDEK · Tooth discoloration and bleaching
During the insertion of bleaching material into the tooth after root canal treatment the gingiva, for protection, should be coated with:
- A. zinc oxide.
- B. gum arabic.
- C. flowable composite.
- D. petroleum jelly.
- E. methylene blue.
Hint
Think of a simple water-repellent barrier, applied before the rubber dam, that keeps the peroxide away from the mucosa.
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