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Endodontics · single question

What happens if a topical anesthetic such as benzocaine is introduced into a root canal?

  1. It sterilizes the canal system
  2. It improves sealer adhesion to dentin
  3. It enhances irrigant penetration into tubules
  4. It coats the canal walls and compromises the obturation seal
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Correct answer: D. It coats the canal walls and compromises the obturation seal

  • A. Benzocaine has no meaningful antimicrobial activity.
  • B. It does the opposite — the residue interferes with sealer bonding.
  • C. The residue physically obstructs irrigant contact with the dentin surface.
  • D. Correct. Benzocaine gels are formulated in oily/glycol vehicles that leave a hydrophobic film on the dentin walls, blocking sealer adaptation and tubule penetration, resulting in a compromised seal and leakage.

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