How soon after a moisture contamination does a zinc containing amalgam alloy start expanding________________?
Correct answer: D. 3-5 days
- A. 24 hours
- B. 1-2 days
- C. 7 days
- D. 3-5 days
Explanation
When zinc-containing amalgam is contaminated with moisture before setting, hydrogen generation causes delayed expansion that becomes noticeable after roughly 3 to 5 days. This is why moisture control is essential during placement.
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Practise Restorative Materials
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