5.3 Registered Dental Hygienist in Extended Functions (RDHEF) Duties and Limitations

5.3 Registered Dental Hygienist in Extended Functions (RDHEF) Duties and Limitations

The Registered Dental Hygienist in Extended Functions (RDHEF) is the third statutory dental hygiene category licensed by the Dental Hygiene Board of California (DHBC). Candidates routinely over-estimate this credential, imagining it as a restorative license comparable to the Registered Dental Assistant in Extended Functions (RDAEF). It is not. The RDHEF duty list is short, closed, and entirely performed under direct supervision, and the Law and Ethics examination tests the boundary rather than the technique.

Licensure Pathway (BPC § 1918)

BPC § 1918 states that the dental hygiene board shall license as an RDHEF a person who meets all of the following:

• (a) Holds a current license as a registered dental hygienist in California.
• (b) Completes clinical training approved by the dental hygiene board in a facility affiliated with a dental school, under the direct supervision of dental school faculty.
• (c) Performs satisfactorily on an examination required by the dental hygiene board.
• (d) Completes an application form and pays all application fees required by the dental hygiene board.

In addition, 16 CCR § 1121 requires every RDH, RDHAP, and RDHEF applicant to take and pass a supplemental written California Law and Ethics examination specific to that license class, with a minimum passing score of 75%. There is no separate "RDHEF-only" practice act: BPC § 1921 provides that an RDHEF (like an RDHAP) "may perform any of the duties or functions authorized to be performed by a registered dental hygienist," and BPC § 1907(a) layers registered dental assistant functions on top.

The Closed List: Seven Extended Functions (16 CCR § 1089(c))

The RDHEF duty list lives in regulation, not statute. 16 CCR § 1089 — "RDHEF Duties and Settings" — is the controlling authority:

• § 1089(b): an RDHEF "may perform all duties assigned to dental assistants, registered dental assistants and registered dental hygienists."
• § 1089(c): in addition, and under the direct supervision of a licensed dentist, an RDHEF may perform these seven procedures:
  1. Cord retraction of gingivae for impression procedures;
  2. Take impressions for cast restorations;
  3. Take impressions for space maintainers, orthodontic appliances, and guards;
  4. Prepare enamel by etching for bonding;
  5. Formulate indirect patterns for endodontic post and core castings;
  6. Fit trial endodontic filling points;
  7. Apply etchant for bonding restorative materials.

Every one of these procedures must be performed pursuant to the order, control, and full professional responsibility of the supervising dentist, and must be checked and approved by that dentist before the patient is dismissed from the office.

What an RDHEF May Not Do (16 CCR § 1089(a) → § 1085(a)(1)–(8))

16 CCR § 1089(a) expressly imports the dental-auxiliary prohibitions of 16 CCR § 1085(a)(1) through (8) and applies them to RDHEFs. Those eight prohibitions are:

1. Diagnosis and treatment planning;
2. Surgical or cutting procedures on hard or soft tissue;
3. Fitting and adjusting of correctional and prosthodontic appliances;
4. Prescription of medicines;
5. Placement, condensation, carving or removal of permanent restorations, including final cementation procedures;
6. Irrigation and medication of canals, try-in cones, reaming, filing or filling of root canals;
7. Taking of impressions for prosthodontic appliances, bridges, or any other structures which may be worn in the mouth;
8. Administration of injectable and/or general anesthesia.

Prohibition (5) is the single most-missed point on this topic. An RDHEF may not place, condense, carve, or remove an amalgam or composite permanent restoration, and may not perform final cementation of a crown, inlay, onlay, or bridge. That result is reinforced at the statutory level: BPC § 1908(b)(2) removes "placing, condensing, carving, or removal of permanent restorations" from the practice of dental hygiene altogether, and BPC § 1921 only extends dental hygiene duties to the RDHEF. Prohibition (6) likewise limits the endodontic function to fitting trial points — the RDHEF does not irrigate, medicate, ream, file, or fill the canal.

Note the careful interaction between prohibition (7) and authorized duties (2) and (3). An RDHEF may take impressions for cast restorations and for space maintainers, orthodontic appliances, and guards, because § 1089(c) specifically so provides; the § 1085(a)(7) ban on impressions for prosthodontic appliances and bridges applies only where the regulation has not "specifically so provided."

Authorized Settings (16 CCR § 1089(d))

An RDHEF may perform the extended functions only "in a treatment facility under the jurisdiction and control of the supervising licensed dentist, or an equivalent facility approved by the Board." There is no community, mobile, school, or residence authority for RDHEF extended functions — that flexibility belongs to the RDHAP category, and an RDHEF who also holds RDHAP licensure exercises it under BPC §§ 1925–1926, not under § 1089.

Direct Supervision, Defined (BPC § 1902(c))

Because every § 1089(c) duty is a direct-supervision duty, BPC § 1902(c) controls: direct supervision means supervision of dental procedures based on instructions given by a licensed dentist who is required to be physically present in the treatment facility during the performance of those procedures. Telephone availability, video supervision, or presence in an adjacent building does not satisfy the standard. 16 CCR § 1089(c) adds the second half of the requirement — dentist check and approval before dismissal.

Renewal

An RDHEF license renews biennially like any other DHBC license, and 16 CCR § 1017(c)(6) fixes the continuing education requirement at 25 units per two-year renewal period — the same as an RDH, and lower than the 35 units required of an RDHAP under § 1017(c)(8).