Restorative & Materials · single question

How can the setting time of alginate be DECREASED (faster set)?

  1. Use warm water
  2. Store in cool dry place
  3. Increase powder-to-water ratio
  4. Use cold water
Show answer and explanation

Correct answer: A. Use warm water

Warm water accelerates the alginate gelation reaction. Cold water slows it (more working time).
  • A. ✅ CORRECT – Warm water accelerates gelation, shortening setting time.
  • B. ❌ Storage prevents degradation but doesn't affect in-use setting time.
  • C. ❌ Increasing P:W ratio produces stiffer mix but temperature effect is more practical.
  • D. ❌ Cold water SLOWS the setting reaction.

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