Final answer:
A Registered Dental Hygienist (RDH) can remove supra-gingival cement under general or direct supervision from a dentist.
Step-by-step explanation:
Medicine
A Registered Dental Hygienist (RDH) is a healthcare professional who specializes in providing oral hygiene care. They work under the supervision of a dentist and are authorized to perform certain dental procedures.
In terms of removing supra-gingival cement, an RDH can do this procedure under either general or direct supervision. General supervision means that a dentist must be present in the office to provide overall instructions and oversight, but does not need to be physically present during the procedure. Direct supervision means that the dentist must be physically present in the treatment room while the RDH is performing the procedure