Which of the following is an appropriate step after taking an impression?

Soaking an impression in disinfectant is the appropriate step after taking it because it is essential for infection control. Disinfecting the impression helps eliminate any bacteria, viruses, or other pathogens that may be present, ensuring the safety of both the dental team and the patient. This step is particularly critical in preventing cross-contamination, especially in a clinical setting where multiple patients may come into contact with various instruments and materials.

Disinfecting also helps preserve the integrity of the impression material if done with a suitable disinfectant; it ensures that the impression remains viable for casting and further procedures. This practice aligns with the standard protocols established for maintaining hygiene and safety in dental practices.

Other options like rinsing it with cold water may not effectively reduce the microbial load and could potentially alter the impression material’s properties. Placing it directly in the refrigerator might preserve the impression but does not adequately address contamination risk. Lastly, allowing it to air dry does not ensure the elimination of pathogens and could lead to inaccuracies in the impression if contaminants remain.