Pennsylvania Expanded Function Dental Assistant (EFDA) Board Practice Exam 2025 - Free EFDA Practice Questions and Study Guide

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What should properly mixed amalgam not appear as?

Dry or grainy

Properly mixed amalgam should have a smooth and cohesive consistency that is neither dry nor grainy. When amalgam is dry or grainy, it may indicate that not enough mercury was used or that the mixing process was inadequate, leading to a mixture that does not bind well. This can compromise the physical properties of the amalgam, making it less effective for restorative purposes.

A well-mixed amalgam should exhibit a glossy appearance and be workable, allowing it to be packed into tooth cavities effectively. Other potential appearances like wet or runny, brittle or weak, and loose or crumbly are generally associated with either excessive moisture in the mix, improper chemical ratios, or poor storage and handling, but the key marker for identifying poor mixing is the presence of dryness or graininess in the amalgam.

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Wet or runny

Brittle or weak

Loose or crumbly

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