Endodontics · single question
Which irrigant/chelating agent is used to remove the SMEAR LAYER during root canal therapy?
Show answer and explanation
Correct answer: A. EDTA (ethylenediaminetetraacetic acid)
- A. Correct. EDTA is a chelator that removes the inorganic smear layer, opening dentinal tubules (often used alternately with NaOCl).
- B. NaOCl dissolves organic tissue/disinfects but does not remove the inorganic smear layer effectively on its own.
- C. Chlorhexidine is an antimicrobial irrigant but does not remove the smear layer.
- D. Saline is an inert rinse with no smear-layer removal.