Which of the following would you NOT use for a pulpectomy in a primary tooth?

Correct answer: A. EDTA

• A. CORRECT — EDTA (ethylenediaminetetraacetic acid) is a chelating agent used to remove the smear layer in permanent tooth root canal therapy. It is NOT indicated for primary tooth pulpectomy because primary root canals are resorbing and don't require smear layer removal the same way. EDTA would also accelerate root resorption.
• B. INCORRECT — Formocresol (though not an option in the recall) is the classic medicament used in pulpotomy and pulpectomy of primary teeth.
• C. INCORRECT — Chlorhexidine is an acceptable antimicrobial irrigant used in pediatric pulpectomy procedures.
• D. INCORRECT — Sodium hypochlorite is the primary irrigant used in pulpectomy for both primary and permanent teeth.