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Cracked root after post placement — NDEB AFK MCQ

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HardRestorativeCracked root after post placementNDEB AFK

A root-treated premolar restored with a rigid post has sudden biting pain and a sinus tract. Radiograph shows a lateral radiolucency along the root and the post is wide relative to root dentine. What is the most likely cause/mechanism?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: C — Root fracture from excessive post preparation

A wide rigid post can weaken remaining radicular dentine and contribute to vertical or lateral root fracture, producing biting pain and a lateral lesion. Enamel etching and alginate disinfection do not explain a sinus tract associated with a root-treated post crown. The pearl is that posts retain cores; they do not strengthen teeth.

Reference: Endodontic and prosthodontic reference texts; NDEB KSAs 2024