skip to main content

Zinc phosphate cement sensitivity — NDEB AFK MCQ

Instant feedback + full explanation. One question, done properly.

HardRestorativeZinc phosphate cement sensitivityNDEB AFK

A vital prepared molar is cemented with zinc phosphate cement after prolonged drying. The patient develops immediate postoperative sensitivity. The crown margin is acceptable radiographically. What is the most likely cause/mechanism?

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

Reveal the answer and explanation

Correct answer: D — Pulp irritation from acidity and dentine desiccation

Zinc phosphate cement has an initially low pH, and prolonged dentine desiccation increases pulpal irritation risk. Fluoride release is not the mechanism for zinc phosphate sensitivity. The pearl is that dentine protection, sensible drying, and cement selection matter when cementing vital preparations.

Reference: Dental materials reference texts; NDEB KSAs 2024