Apical Patency — NDEB AFK MCQ
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Correct answer: C — It ensures the apical foramen remains open and unblocked by dentin debris, preventing loss of working length and ensuring complete debridement
Apical patency is maintained by periodically passing a small-diameter file (#10 or #15) through the apical foramen during instrumentation to prevent blockage by dentin chips (apical plug). This ensures the working length is maintained, irrigant reaches the apical region, and the canal remains negotiable throughout the procedure. Apical patency should be performed gently with minimal force to avoid pushing debris beyond the apex. It is a principle advocated by most contemporary endodontic techniques.
Reference: Torabinejad – Endodontics: Principles and Practice, 6th ed., 2021