What effect does a higher residual mercury content have on a silver amalgam filling?

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Lead to cracking of the restorationResult in discoloration and surface degradationEnhance the durability of the fillingReduce the pressure required during condensation

Explanation

An increased amount of leftover mercury in silver amalgam can weaken the restoration, making it prone to fractures. While tarnishing and corrosion are concerns, they are not directly caused by excess mercury. Higher mercury content does not improve strength or affect condensation pressure significantly.