Name two bioactive materials used in MID and their rationale?

• A. Biodentine and MTA because they release minerals, promote dentin formation, and seal or heal.
• B. Amalgam and composite because they bond well to dentin.
• C. Glass ionomer and resin cement because they do not release minerals.
• D. Calcium hydroxide paste and ZOE because they are inert.

Answer: (A)

In minimally invasive dentistry, the most helpful materials are those that actively interact with the pulp and dentin to promote healing and new dentin formation. Biodentine and MTA are both bioactive calcium silicate–based materials that release calcium ions and form a mineralized interface with dentin. This bioactivity stimulates reparative dentin formation and provides a strong seal, supporting pulp vitality and healing while fitting well with the minimally invasive approach. They also set in the presence of moisture and generally offer good biocompatibility and sealing ability, which are important for preserving tooth structure and avoiding microleakage.

Other materials listed are primarily restorative or do not provide the same level of dentin-stimulating bioactivity. Amalgam and composite restore without promoting dentinogenesis; glass ionomer and resin cement have some beneficial properties but not the robust dentin-forming bioactivity seen with the calcium silicate materials; calcium hydroxide paste can be bioactive but ZOE is not, and the pairing here does not reflect two active dentin-regenerating options.