Post Preparation Shape — 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: E — Anti-rotational (matching the canal shape — often oval or irregular)
The ideal post-preparation shape should match the natural root canal anatomy to maximise adaptation while conserving dentin. Since most canals are oval or irregular in cross-section (not round), an anti-rotational shape that conforms to the canal provides better retention (resistance to rotation) than a round post in an oval canal. Custom cast posts are adapted to the canal shape perfectly. Prefabricated posts are usually round and may require modification or may not provide anti-rotation in oval canals without additional retention features.
Reference: Shillingburg – Fundamentals of Fixed Prosthodontics, 4th ed., 2012