How does condensation during amalgam placement affect its dimensional changes?

The correct answer highlights that condensation during amalgam placement decreases expansion. When dental amalgam is condensed properly into the cavity preparation, it promotes a denser packing of the material. This dense packing minimizes voids and reduces the potential for excess mercury, which can contribute to dimensional changes like expansion.

Proper amalgam condensation ensures that the amalgam particles are closely packed, which stabilizes the structure and supports strengths during setting. Additionally, reducing voids in the material during placement diminishes the likelihood of moisture ingress that may lead to undesirable properties.

Understanding the significance of condensation helps in achieving optimal properties for the amalgam restoration, ensuring that the final set amalgam displays reduced dimensional changes that might otherwise compromise the integrity of the restoration over time.