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Endodontics · single question

Regarding internal bleaching (walking bleach technique), which of the following statements is FALSE?

  1. Remove filling material 2 mm below the cemento-enamel junction
  2. Remove debris from the pulp chamber walls and pulp horns
  3. Place absolute rubber dam isolation
  4. Place 1 mm of barrier between gutta-percha and the pulp chamber (2–3 mm is ideal)
Show answer and explanation

Correct answer: D. Place 1 mm of barrier between gutta-percha and the pulp chamber (2–3 mm is ideal)

  • A. INCORRECT — Removing root canal filling material 2 mm below the CEJ is a correct step that creates access for the bleaching agent while reducing risk of cervical resorption.
  • B. INCORRECT — Removing pulpal remnants and debris from the chamber walls and pulp horns is a required step for effective bleaching.
  • C. INCORRECT — Absolute rubber dam isolation is mandatory for internal bleaching to prevent chemical exposure to oral tissues.
  • D. CORRECT (FALSE statement) — Placing only 1 mm of barrier is INSUFFICIENT and incorrect. The ideal barrier thickness is 2–3 mm to prevent bleaching agents from leaking into the periodontal space via dentinal tubules and causing cervical root resorption.

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