What should the nurse do first to protect a patient's dentures while cleaning them in the sink?

Padding the basin with a washcloth is the first action a nurse should take to protect a patient's dentures while cleaning them in the sink. This step is crucial because it creates a softer surface that can help prevent the dentures from breaking or chipping if they accidentally slip from the nurse's hands. Dentures are often made from materials that can be susceptible to damage, so providing this extra layer of protection is a practical measure.

While performing hand hygiene is essential for infection control, it does not directly address the immediate concern of protecting the dentures during cleaning. Additionally, filling the sink with cold water could provide some level of cushioning but may not offer the same protective benefit as a washcloth. Filling the sink with hot water is not advisable, as hot water can warp or damage the dentures, making it an unsuitable option for safe cleaning. Thus, padding the basin is the most effective and appropriate first step to ensure the safety of the patient's dentures.