How should an alginate impression be stored if it cannot be poured up immediately?

When alginate impressions cannot be poured up immediately, wrapping them in a slightly moist paper towel is the most effective method for storage. This approach helps to prevent the impression from drying out, which can lead to distortion and inaccuracies in the final dental cast. The moisture in the paper towel maintains a suitable environment for the impression material, preserving the details necessary for accurate replication.

While other storage methods might seem viable, they do not perform as well in protecting the integrity of the impression. Storing alginate impressions in a dry environment can cause them to dry out and shrink, resulting in a loss of precision. Keeping them in the refrigerator may seem like a good idea to maintain moisture; however, it can also cause the alginate to set improperly if the temperature is too low. Submerging alginate impressions in water is not recommended either, as it can lead to swelling and loss of definition.

Overall, using a slightly moist paper towel strikes the right balance, ensuring the alginate retains its properties until it can be processed into a cast.