Ferrule Effect — NDEB AFK MCQ
Instant feedback + full explanation. One question, done properly.
Educational content. Not a substitute for clinical judgement or local policy.
Reveal the answer and explanation
Correct answer: C — A minimum of 1.5-2 mm of supragingival sound dentin engaged circumferentially by the crown margin
The ferrule effect describes the circumferential embrace of at least 1.5-2 mm of sound supragingival dentin by the crown margin, providing resistance to fracture. It is the single most important factor in the long-term success of endodontically treated teeth restored with posts and cores. Without adequate ferrule, the root is prone to oblique fracture under functional loading regardless of the post type used.
Reference: Shillingburg – Fundamentals of Fixed Prosthodontics, 4th ed., 2012