Which step is NOT part of taking an alginate impression?

Taking an alginate impression involves a series of specific steps necessary to ensure the accuracy and quality of the impression. Mixing the alginate correctly is fundamental, as the right consistency is crucial for the impression's effectiveness. Keeping the tray in place until the alginate sets is equally important, as this allows for complete material interaction and accurate replication of the oral structures. Rinsing the impression after removal helps to remove any residual saliva or debris, ensuring clarity and preventing distortion of the impression when it is poured with gypsum.

Injecting alginate into the gum, however, is not a part of the standard procedure. Typically, alginate is used to fill a tray that is then seated over the dental structures. The material flows and adapts around the teeth and soft tissues through the tray without needing to be injected directly into the gums. This step does not adhere to the established protocols for taking an alginate impression, ensuring that the vital details of the oral cavity are accurately captured without unnecessary risks.