This list is not all inclusive. Delegation of procedures not in subsections (1) through (22) of this section should not be assumed to be allowed. Supportive services approved for delegation to registered dental assistants are under WAC 246-817-520. A dentist may not allow registered dental assistants who are in his or her employ or are acting under his or her supervision or direction to perform any of the following procedures:

(1) Any removal of or addition to the hard or soft natural tissue of the oral cavity.

(2) Any placing of permanent restorations in natural teeth.

(3) Any diagnosis of or prescription for treatment of disease, pain, deformity, deficiency, injury, or physical condition of the human teeth or jaws, or adjacent structure.

(4) Any administration of general or local anesthetic, including intravenous sedation.

(5) Any oral prophylaxis, except coronal polishing as a part of oral prophylaxis as defined under WAC 246-817-510 and 246-817-520 (4)(e).

(6) Any scaling procedure.

(7) The taking of any impressions of the teeth or jaws, or the relationships of the teeth or jaws, for the purpose of fabricating any intra-oral restoration, appliances, or prosthesis, other than impressions allowed as a delegated task under WAC 246-817-520.

(8) Intra-orally adjust and finish permanent restorations.

(9) Cement or recement any permanent restoration or stainless steel crown.

(10) Incise gingiva or other soft tissue.

(11) Elevate soft tissue flap.

(12) Luxate teeth.

(13) Curette to sever epithelial attachment.

(14) Suture.

(15) Establish occlusal vertical dimension for dentures.

(16) Try-in of dentures set in wax.

(17) Insertion and post-insertion adjustments of dentures.

(18) Endodontic treatment - Open, extirpate pulp, ream and file canals, establish length of tooth, and fill root canal.

(19) Use of any light or electronic device for invasive procedures.

(20) Intra-oral air abrasion or mechanical etching devices.

(21) Place direct pulp caps.

(22) Fit and adjust occlusal guards.