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Prosthodontics & Occlusion · single question

What is the FIRST step immediately after removing an alginate impression from the mouth?

  1. Spray it with a disinfectant and bag it
  2. Rinse it under running water
  3. Wrap it in a damp paper towel
  4. Pour it immediately in stone
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Correct answer: B. Rinse it under running water

  • A. ❌ Disinfection is the SECOND step, after rinsing.
  • B. ✅ CORRECT — RINSE FIRST. Running water removes saliva, blood and debris. Disinfectant cannot penetrate an organic film, so cleaning must precede disinfection — this order is specified in the CDC guidelines.
  • C. ❌ Storing in a damp towel is for delaying the pour and risks imbibition; it is not the immediate first step.
  • D. ❌ Pouring must wait until the impression has been rinsed and disinfected, both for infection control and for cast quality.

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