In the low-copper amalgams,zinc was responsible for the gradual _____ of the amalgam over time if moisture contamination was present during placement.

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In the low-copper amalgams,zinc was responsible for the gradual expansion of the amalgam over time if moisture contamination was present during placement.Contact of the moisture with zinc caused the formation of hydrogen gas within the amalgam,which caused it to expand.Delayed expansion could cause the restoration to expand beyond the cavity walls and could cause cracking in the adjacent enamel.

In the Low-Copper Amalgams,zinc Was Responsible for the Gradual _____