Which temporary restoration materials are favored after endodontic instrumentation?

• A. Cavit
• B. Resin-based composite restorations
• C. Glass ionomer cement or zinc oxide-eugenol temporary restorations
• D. Amalgam

Answer: (C)

When a tooth needs a temporary seal after endodontic instrumentation, the main goal is to protect the prepared canal and prevent microleakage until the next visit, while still being easy to remove without disturbing the root filling. Glass ionomer cement fits well here because it bonds to dentin, seals effectively, releases fluoride, and tolerates some moisture—all helpful in a temporary situation where perfect isolation isn’t guaranteed. Zinc oxide-eugenol paste is another good option for the same stage because it is biocompatible, provides a protective, sedative layer for the tooth, and is straightforward to place and remove when the next appointment arrives.

Other materials have drawbacks for this specific use. Cavit can provide a quick seal, but it tends to wear or fail under longer temporary periods. Resin-based composites offer excellent esthetics and strength but are technique-sensitive, may require strict isolation, and can be harder to remove without affecting the tooth or the canal seal. Amalgam is durable and easy to place, but it’s less ideal for a short-term seal and isn’t preferred for aesthetic or removability reasons in this context.

So, glass ionomer cement or zinc oxide-eugenol temporary restorations are favored because they balance sealing, biocompatibility, and easy removal between endodontic visits.