What is the proper time to pour alginate impression up in stone?

Pouring alginate impressions in stone should be done immediately after taking the impression. This is critical because alginate materials are hydrophilic, meaning they can absorb moisture from the environment, which can lead to distortion or dimensional changes if they are left too long before being poured.

By pouring the impression right away, one ensures that the details captured in the alginate are maintained, allowing for a more accurate stone model. Waiting for extended periods, such as one hour, three hours, or a day, can compromise the quality of the impression, leading to inaccuracies in the final stone cast due to changes in the alginate's physical properties. Therefore, to achieve the best results in dental impressions, pouring immediately is essential.