In usage tests, pulp reaction is

• A. none
• B. mild
• C. moderate
• D. severe

Answer: (B)

In usage tests, the pulp typically shows only a mild inflammatory reaction. This level of response indicates a small, usually reversible irritation from the material that is kept in check by the dentin barrier and the pulp’s natural reparative capacity. Mild pulp reaction is taken as a sign of acceptable biocompatibility in a clinical setting, where some irritation is expected but no lasting damage occurs. A severe reaction would point to significant cytotoxic effects or irritation, raising concern about biocompatibility. An absence of any reaction is unlikely in routine usage tests, since even well-tolerated materials can produce some minimal irritation when in contact with the pulp, though it should fade over time.