What is the role of trisodium phosphate in alginate?

Trisodium phosphate plays a critical role in the setting process of alginate impression materials. Its primary function is to control the setting time, specifically by slowing down the reaction when needed. When trisodium phosphate is included in the formulation, it acts as a retarder, helping to ensure that the alginate does not set too quickly after mixing. This allows dental professionals more time to manipulate the material and ensure a proper impression can be made without haste.

Using trisodium phosphate is particularly useful in situations where the clinician needs additional time for application or when working with patients who may require a longer impression-taking process. Being able to manage the setting time effectively is crucial for achieving accurate dental impressions.