Prohibited Procedures of Dental Hygienists and Assistants

Dental hygienists shall not perform those procedures which constitute the practice of dentistry as described in the Illinois Dental Practice Act. Hygienists may not perform procedures that require the professional judgment and skill of a dentist. Such prohibited procedures include, but shall not be limited to, the following:

  • Making denture adjustments.
  • Condensing or carving amalgam restorations.
  • Placing and finishing composite restorations.
  • Taking final impressions for the fabrication of prosthetic appliances, crowns, bridges, inlays, onlays or other restorative or replacement dentistry.
  • Permanently cementing permanent crowns or bridges.
  • Permanently re-cementing permanent crowns or bridges that have come loose.

Provided that a dental assistant if appropriately trained pursuant to Section 1220.245 and is acting under the supervision and full responsibility of a dentist, a dental assistant may perform any dental service or procedure except the following:

  • Any and all diagnosis of or prescription for treatment of disease, pains, deformity, deficiency, injury or physical condition of the human teeth or jaws, or adjacent structures.
  • Removal of, restoration of, or addition to the hard or soft tissues of the oral cavity. For purposes of Section 1220.245, coronal polishing and acid etching of a tooth surface are not considered removal of hard or soft tissues.
  • Any and all correction of malformation of teeth or of the jaws.
  • Administration of anesthetics except for topical anesthetics and monitoring of nitrous oxide as specified in Section 1220.245. (Additional training required)
  • Removal of calculus from teeth.
  • Taking of final impressions for the fabricating of prosthetic appliances, crowns, bridges, inlays, onlays, or other restorative or replacement dentistry.
  • The operative procedure of dental hygiene consisting of oral prophylactic procedures except for coronal polishing as specified in Section 1220.245. (Additional training required)
  • Making denture adjustments.
  • Condensing or carving amalgam restorations.
  • Placing and finishing composite restorations.
  • Permanently cementing permanent crowns or bridges.
  • Permanently re-cementing permanent crowns or bridges that have come loose.
  • Placement of any chemotherapeutic agent for the management of periodontal disease.
  • Applying cavity bases.
  • Cementing bands and/or bonding brackets.
  • Performing supragingival or subgingival scaling.
  • Performing pulp vitality tests.


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