What action cannot be performed by an unqualified dental nurse?

Changing processing solutions is a task that requires specific training and knowledge of chemical safety, as well as an understanding of the implications of using different solutions within the dental practice. This process involves handling potentially hazardous materials and ensuring that the solutions used are appropriate for the equipment and the types of procedures being performed.

An unqualified dental nurse, lacking the necessary training, may not be familiar with the proper protocols or safety measures required in handling these solutions. Consequently, performing this action without proper qualifications could lead to accidents, contamination, or erroneous results in diagnostic imaging.

In contrast, while certain tasks related to setting exposure, processing films, or running a quality assurance audit may also require training, the nature of changing processing solutions makes it significantly more critical to be performed only by qualified personnel.