Which of the following is a permitted function for a Dental Hygienist?

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The main idea here is understanding what a dental hygienist is allowed to do under supervision and what tasks can be delegated to them. Taking impressions for final fixed or removable restorations is a function that dental hygienists can perform under supervision because it supports the restorative workflow without placing the dentist outside their oversight. The impression is a diagnostic tool used to fabricate crowns, bridges, or dentures, and having the hygienist take it helps move treatment forward while the dentist remains responsible for the final restoration and treatment plan.

The other options involve procedures that are not within the typical scope of a hygienist's delegated duties or require supervision in ways that aren’t consistent with their role. Cementing temporary restorations and coronal polishing without supervision raise safety and scope concerns, and applying dentin desensitizing solutions, while related to hygiene care, does not align with the specific restorative task highlighted in this item.