Final answer:
A registered dental hygienist (RDH) can perform all the duties of a dental assistant (DA) and a registered dental assistant (RDA) under both general and direct supervision.
Step-by-step explanation:
A registered dental hygienist (RDH) can perform all the duties of a dental assistant (DA) and a registered dental assistant (RDA) under both general and direct supervision. This means that an RDH can work independently or under the direct guidance of a dentist, depending on the specific task at hand.
Under general supervision, an RDH can provide oral health assessments, perform dental cleanings, take dental X-rays, and educate patients on proper dental hygiene practices. They can also administer local anesthesia and apply dental sealants.
Under direct supervision, an RDH can perform additional duties such as restorative procedures like placing dental fillings and fabricating temporary crowns. They can also perform minor orthodontic procedures and even assist in surgical procedures.