Root-End Cavity Depth — NDEB AFK MCQ
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Correct answer: A — 3 mm
The root-end cavity preparation during apicoectomy should be approximately 3 mm deep into the resected root surface, along the long axis of the root canal. This depth ensures adequate bulk of retrograde filling material (MTA or bioceramic) for a hermetic seal while preserving root structure. The cavity is prepared with ultrasonic tips (preferred) or small round burs under magnification (dental operating microscope). The preparation should include the entire canal space and any isthmuses between canals (in multi-canal roots).
Reference: Torabinejad – Endodontics: Principles and Practice, 6th ed., 2021