Endodontic Success Criteria — NDEB AFK MCQ
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Correct answer: B — Complete resolution or significant reduction of a pre-existing periapical radiolucency
The most reliable objective sign of successful endodontic treatment is radiographic healing — complete resolution or significant reduction of a pre-existing periapical radiolucency at 1-year follow-up (and continuing at 4-year follow-up per Strindberg criteria). Additional criteria include: absence of clinical signs/symptoms (pain, swelling, sinus tract), functional tooth in the arch, and no evidence of root resorption progression. The Toronto Study (Friedman & Mor, 2004) defines success as absence of apical periodontitis, and functional retention as a separate positive outcome.
Reference: Torabinejad – Endodontics: Principles and Practice, 6th ed., 2021