Cause of expansion in zinc containing amalgam is_____________?
Correct answer: C. Hydrogen
- A. Zinc and water
- B. Water
- C. Hydrogen
- D. Nascent oxygen
Explanation
Delayed expansion occurs when zinc in the amalgam reacts with moisture and produces hydrogen gas; the gas pressure expands the restoration after setting. Thus, hydrogen is the direct cause, while water is the necessary trigger.
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