Which material is used in vital pulp therapy/regenerative endodontics for its biocompatibility and ability to induce hard-tissue (dentin bridge) formation?

Correct answer: A. Mineral trioxide aggregate (MTA)

• A. Correct. MTA is biocompatible, sets in moisture, seals well, and stimulates reparative hard-tissue formation (pulp capping, apexification, perforation repair).
• B. Zinc phosphate is a luting cement, not a bioactive pulp material.
• C. Amalgam is a direct restorative, not a regenerative material.
• D. Polycarboxylate is a luting/base cement without regenerative bioactivity.