Which activity does not require a dentist's direct involvement for dental hygienists?

The task of removing excess cement does not necessitate direct involvement from a dentist when performed by a dental hygienist. This procedure falls within the scope of practice for dental hygienists in many regulatory jurisdictions, allowing them to carry out certain clinical tasks independently or under general supervision.

In dental practice, hygienists are trained to perform supportive procedures that aid in patient care, and removing excess cement after a restorative procedure is generally considered a technical task that does not require a dentist's immediate presence. This is often allowed under established protocols since it is a relatively straightforward task that does not involve complex decision-making or require specialized pain management.

In contrast, activities such as taking impressions, administering local anesthesia, and monitored sedation involve skill sets, decision-making, and patient safety considerations that typically necessitate direct oversight or involvement of a licensed dentist. These tasks have specific legal and practical implications regarding patient care and safety, reflecting the higher level of responsibility and potential risks associated with them.