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Background. For many years, alginates have remained the most frequently chosen impression materials in the initial stages of treatment due to their numerous advantages, such as ease of insertion and removal from the oral cavity, or low cost of the material. In recent years, alginate impression materials called "extended-pour" have appeared on the dental market, allowing clinicians to make plaster models even after a few days.Aim. The aim of the study was to perform a three-dimensional evaluation of extendedpour alginate impressions depending on the environment and storage time.Material and methods. A series of threedimensional images of forty impressions made of high dimensional stability alginate were tested. The scans were divided into groups depending on the conditions of storing the impressions. The three-dimensional images were superimposed using graphic software, and the deviations were calculated. Data in the form of 5600 deviation values were subjected to statistical analysis.

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