For amalgam restorations with 0.5 to 2 mm remaining dentin thickness, what is used?

• A. Sealer
• B. Liner
• C. Liner and Sealer
• D. Base and Sealer

Answer: (D)

When there is only a moderate amount of dentin left (about 0.5 to 2 mm) under an amalgam, you need both bulk to support the restoration and protection of the pulp. A base is placed to replace missing dentin, provide mechanical support, and help insulate against temperature changes. A sealer (varnish or dentin sealer) is used to seal the dentin tubules and reduce microleakage at the interface with the restoration. This combination addresses both the need for structural backing and pulp protection, making base plus sealer the best choice for this level of remaining dentin. Liner alone wouldn’t provide enough bulk or support, and sealer without a base wouldn’t supply the necessary insulation and backing.