Within what time period should alginate impressions be poured?

The correct answer is that alginate impressions should ideally be poured within 1 hour after taking the impression. Alginate is a type of hydrocolloid material primarily used for making dental impressions. It is known for its ability to capture fine details, but it is also susceptible to deformation and dimensional changes over time due to factors like moisture loss and temperature changes.

When alginate impressions are left too long before being poured, they can dry out or distort, compromising the accuracy of the cast made from the impression and potentially leading to poor-fitting appliances or restorations. While some sources might suggest a range of times (even up to 2 hours), the best practice emphasizes that within 1 hour is optimal to ensure the integrity and precision of the impression is maintained.

This timeframe allows dental professionals to handle the impressions efficiently while ensuring high-quality results in subsequent procedures. Immediate pouring would certainly be ideal but isn't necessarily feasible in all situations, thus emphasizing the recommendation of 1 hour as a practical guideline.