Biomechanical Preparation — NDEB AFK MCQ
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Correct answer: B — Cleaning, shaping, and disinfecting the root canal system to create a continuously tapered funnel shape from the coronal access to the apical constriction
Biomechanical preparation (chemo-mechanical debridement) is the critical phase of root canal treatment involving: (1) cleaning — removal of pulp tissue (vital or necrotic), bacteria, debris, and smear layer using irrigants (NaOCl, EDTA); (2) shaping — creating a continuously tapered funnel preparation from the coronal access cavity to the apical constriction using rotary/reciprocating files, maintaining the original canal anatomy and apical constriction; and (3) disinfection — eliminating bacteria through irrigant action, intracanal medicament, and mechanical debridement. Successful biomechanical preparation is the foundation for effective obturation and long-term endodontic success.
Reference: Torabinejad – Endodontics: Principles and Practice, 6th ed., 2021