Which task can a dental hygienist perform on custom fluoride trays?

A dental hygienist is permitted to fabricate custom fluoride trays in a laboratory setting. This task falls within the scope of practice for dental hygienists, as they are trained in the basics of dental materials and procedures. Custom fluoride trays are essential tools used to deliver fluoride treatments, which help in the prevention of dental caries. The fabrication process involves taking impressions of patients’ teeth to create trays that fit securely and effectively, ensuring optimal delivery of fluoride during treatment.

In contrast, performing surgical procedures requires a level of training and expertise that goes beyond what is typically within the scope of a dental hygienist's practice. Diagnosis of dental diseases is generally the responsibility of a dentist, as it requires comprehensive education and clinical judgment that dental hygienists do not possess. Providing emergency care also usually falls outside the routine duties of dental hygienists, as it often involves more advanced interventions that are typically reserved for dentists or medical personnel trained to handle emergencies. This clarifies why fabricating custom fluoride trays stands out as an appropriate task for dental hygienists.