The formation of reparative dentin that helps prevent pain or pulpitis is known as what?

• A. Reparative dentin
• B. Secondary dentin
• C. Sclerotic dentin
• D. Pulp shielding

Answer: (A)

When the pulp is irritated by decay or trauma, the tooth defends itself by forming dentin to seal and protect the pulp. If the injury is enough to kill the original odontoblasts, new odontoblast-like cells can differentiate from pulp cells and start producing dentin “reparatively.” This reparative dentin acts as a specialized barrier, slowing or stopping the irritant from reaching the pulp and thereby helping prevent pain or pulpitis.

Understanding this as a defensive response clarifies why reparative dentin is the best term: it specifically describes dentin formed in reaction to injury to protect the pulp, distinct from the ordinary, ongoing formation of secondary dentin or the aging-related sclerotic dentin. Pulp shielding is a related idea about protection but is not the exact tissue type formed.