Final answer:
An RDH can apply sealants under either general or direct supervision, in accordance with state regulations. Direct supervision by a registered nurse typically involves more specialized treatments such as dialysis, and includes a variety of tasks from patient assessment to monitoring the treatment.
Step-by-step explanation:
In the context of dental care, a Registered Dental Hygienist (RDH) can perform various tasks either under general or direct supervision. When it comes to applying sealants, an RDH may perform this task under either level of supervision, depending on state regulations. However, this scenario is different from the direct supervision of a registered nurse, who may focus on providing specialized treatments such as dialysis. This includes activities like reviewing patient history, assessing and responding to patient needs, and monitoring the treatment process. Note that the application of sealants by a dental hygienist and the role of a nurse in dialysis are distinct professional duties within their respective fields.