Dental Assistant Requirements in Colorado: Registration, X-Ray Rules & Allowed Duties

The Dental Practice Act's definitions section describes a dental assistant as any person, other than a dentist, dental therapist or dental hygienist licensed in Colorado, who may be assigned or delegated to perform dental tasks or procedures authorized by the act or by board rules.

The statute names no separate assistant tiers, titles, licenses or expanded-function credential.

Because the definition of dental assistant covers anyone who is not a licensed dentist, dental therapist or dental hygienist and who is delegated dental tasks under the act, the statute sets out no application, exam, fee or credential process for becoming a dental assistant in Colorado.

The dentist who delegates the tasks remains the one who is licensed and accountable.

Direct supervision covers tasks that do not need the dentist in the room but do need the dentist on the premises and available for prompt consultation and treatment.

Indirect supervision covers tasks that do not need the dentist in the office or on the premises while the task is performed, but do need the task performed with the dentist's prior knowledge and consent.

Both definitions define 'premises' as the same building, office or treatment facility, close enough to respond in a timely manner to an emergency.

Under indirect supervision, a dental assistant may smooth and polish natural and restored tooth surfaces, apply fluorides and other recognized topical preventive agents, gather and assemble information such as patient history, oral inspection and periodontal charting, administer topical anesthetic while providing dental care, reline or repair dentures against a signed laboratory work order, and perform any other task that does not require a licensed dentist's professional skill.

Two other duties, administering and monitoring nitrous oxide and the hands-on steps of denture construction, require the dentist's direct supervision and are covered in their own sections below.

Colorado's rule on ionizing radiation applies to any unlicensed dental personnel, including assistants, who expose patients to x-rays: they must be at least eighteen and complete a minimum of eight-and-a-half hours of safety education and training covering dental nomenclature, machine operation and exposure factors, operator and patient safety, and hands-on practice in exposure technique, film handling, processing and record documentation.

That training can come from an accredited program, board-approved on-the-job training by a licensed dentist or hygienist, or DANB's Radiation Health and Safety (RHS) or Certified Dental Assistant (CDA) exam.

Written verification of the training must be signed and kept in the employee's record, and newly hired untrained personnel have three months to come into compliance once the task is delegated to them.

A dental assistant may administer and monitor nitrous oxide under the direct supervision of a licensed dentist and in accordance with board rules.

Board Rule 1.14(G) requires the assistant to be appropriately trained before a dentist may delegate that task, with training obtainable through CODA-accredited education or at least six hours of continuing education; delegating the task without documented training proof is a rule violation that can subject both dentist and assistant to discipline.

The supervising dentist remains responsible for determining and documenting the maximum percent-dosage and the length of time nitrous oxide is delivered, and for the fail-safe and scavenging equipment used.

Board Rule 1.12 ties the denture-related tasks in 12-220-501(3)(d) to the dentist's supervision: a dental assistant performing them must be supervised by the dentist, must work in the dentist's regularly announced office location where the dentist is proprietor and regularly practices, and must be identified as a dental assistant.

Any intraoral work on a denture by an assistant or an unlicensed technician is authorized only under a licensed dentist's direct supervision.

A separate, unlicensed lab technician working from a signed laboratory work order may fabricate or repair devices extraorally, but not perform intraoral service except under a dentist's direct supervision.