Zinc Phosphate Cement — NDEB AFK MCQ
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Correct answer: D — Acid-base
Zinc phosphate cement sets via an acid-base reaction between zinc oxide powder (base) and phosphoric acid liquid (acid), forming a zinc phosphate matrix. The mixing technique (incorporating powder slowly on a cooled slab over a large area) controls the exothermic reaction rate and extends working time. It has been the benchmark luting cement for decades due to its long track record.
Reference: Anusavice – Phillips' Science of Dental Materials, 13th ed., 2022