National Dental Examining Board of Canada (NDEB) Practice Exam

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Saliva contamination during Zn containing amalgam condensation will cause what?

  1. Decreased expansion

  2. Increased expansion and increase surface pitting

  3. Neutral effect

  4. Improved strength

The correct answer is: Increased expansion and increase surface pitting

When Zn containing amalgam is being condensed, saliva contamination can result in increased expansion and surface pitting. This is because the chemical reaction between saliva and the amalgam will cause an increase in expansion and also lead to surface pitting, making it more susceptible to damage. Options A, C, and D do not address the potential consequences of saliva contamination and are therefore incorrect.

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