Pulp response to amalgam in shallow cavities or in deep but lined cavities is

• A. Minimal
• B. Inflammation
• C. Moderate
• D. None

Answer: (A)

Protection of the pulp from restorative irritants relies on having a dentin barrier and a protective liner. In shallow cavities, there is enough dentin between the amalgam and the pulp to dampen heat and chemical diffusion, and when a deep cavity is lined with a pulp-protective liner, this adds a further barrier and can even promote reparative dentin. Together, these factors minimize irritation from the amalgam, so the pulpal response is minimal rather than inflamed or moderate. If the cavity were deep without a liner or the dentin thickness were very small, a greater pulpal reaction would be more likely, but with proper protection the typical response is minimal.