What does the greater percentage of mercury in an amalgam indicate?

The correct answer indicates that a greater percentage of mercury in an amalgam is associated with greater expansion of the material once it is set. When the mercury content in the amalgam increases, it alters the physical properties of the mixture, including how much the amalgam expands during the setting process. This is important to consider because excessive expansion can lead to issues such as the restoration disrupting the surrounding tooth structure or causing discomfort to the patient.

In practical applications, while a higher mercury content might enhance the workability of the amalgam and ease its placement, it can also introduce challenges with dimensional stability that practitioners must manage. Therefore, understanding the relationship between mercury content and expansion is crucial for ensuring that dental restorations remain effective and comfortable over time.