In the presence of a small asymptomatic pulp exposure (<1 mm), which technique is indicated?

• A. Indirect pulp cap
• B. Pulpotomy
• C. Root canal therapy
• D. Direct pulp cap

Answer: (D)

Direct pulp cap is chosen when a tooth has a tiny, clean exposure of the pulp and the pulp is still vital and asymptomatic. In a small exposure (less than about 1 mm), the pulp has a good chance to recover if the exposure is sealed promptly and properly. The idea is to protect the exposed pulp with a direct, biocompatible material—such as calcium hydroxide or MTA—that stimulates a defensive dentin bridge and preserves pulp vitality, then seal everything with a durable restoration to prevent microleakage and bacterial ingress.

Context helps: indirect pulp caps are used when the pulp isn’t actually exposed—caries are so deep that the pulp remains covered by dentin, and the goal is to arrest caries and preserve vitality without breaching the pulp. Root canal therapy would be unnecessary here because the pulp isn’t necrotic or irreversibly inflamed. A pulpotomy, which removes the coronal pulp tissue, is more indicated in primary teeth or when the coronal pulp is inflamed but the radicular pulp remains healthy; it’s not the first choice for a small, asymptomatic exposure in a likely vital pulp. The key is maintaining pulp vitality by sealing the exposure effectively so healing and dentin formation can proceed.