How does the application of cavity varnish help in reducing post-operative sensitivity in amalgam restorations?

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By reducing heat transfer to the dental pulpBy limiting marginal leakage around the restorationThrough modification of the restoration material's chemical propertiesBy blocking the infiltration of corrosion products into dentinal tubules

Explanation

The primary role of cavity varnish in amalgam restorations is to reduce post-operative sensitivity by minimizing marginal leakage, which prevents irritants from reaching the pulp through gaps at the restoration margins.