What is a potential risk of using inadequate amounts of mercury in amalgam?

Using inadequate amounts of mercury in amalgam can lead to porosity in the final restoration. Mercury is a key component in amalgam that binds the alloy particles together, enabling a strong, cohesive structure. When there is not enough mercury present, the alloy particles may not fully combine, leading to the formation of voids or pores within the material. These pores can weaken the restoration, making it more susceptible to wear, fracture, and potential failure over time. Thus, an appropriate mercury-to-alloy ratio is essential to ensure the strength and durability of the amalgam filling, ultimately affecting the longevity of the restoration. The other options do not accurately capture the consequences of insufficient mercury, highlighting the importance of using the correct proportions in amalgam mixes.