Final answer:
A Registered Hygienist Extended Functions (RDH-EF) can form indirect patterns for endo post and core castings under general or direct supervision.
Step-by-step explanation:
A Registered Hygienist Extended Functions (RDH-EF) can form indirect patterns for endo post and core castings under general or direct supervision.
General supervision refers to a situation where a dentist has diagnosed the patient's condition and authorized the procedure, but does not need to be present during the procedure. In this case, the RDH-EF can form indirect patterns for endo post and core castings without immediate oversight from the dentist.
Direct supervision means the dentist must be present in the office and available to quickly respond to any questions or emergencies that may arise during the procedure. Under direct supervision, the RDH-EF can still form indirect patterns for endo post and core castings, but the dentist must be physically present in the office.