ADC - Australian Dental Council Infection Prevention and Control Questions and Answers — Questions and Answers
Question 1: A dental assistant sustains a superficial puncture wound from a contaminated explorer during instrument reprocessing. The patient source is unknown. After performing immediate first aid by washing the area with soap and water, what is the most critical next step according to Australian workplace safety protocols?
- Apply a strong antiseptic like iodine and cover the wound.
- Immediately report the incident to the supervising dentist for risk assessment and documentation. (Correct answer)
- Wait until the end of the day to see if any local signs of infection appear.
- Request a precautionary course of broad-spectrum antibiotics from a GP.
Correct answer: Immediately report the incident to the supervising dentist for risk assessment and documentation.
Australian guidelines emphasise the immediate reporting of any sharps or exposure incident to a supervisor. This allows for a prompt risk assessment, documentation, and determination of the need for further medical evaluation or post-exposure prophylaxis (PEP), which is crucial for managing potential transmission of blood-borne viruses.
Question 2: Which of the following provides the highest level of assurance that a sterilisation cycle in a steam autoclave has been effective in killing all microbial life, including highly resistant spores?
- A Class 1 chemical indicator on the outside of a package changing colour.
- The autoclave's physical printout showing the correct time, temperature, and pressure were reached.
- A biological indicator (spore test) showing no growth after incubation. (Correct answer)
- A Class 5 chemical integrating indicator inside the package changing colour as specified.
Correct answer: A biological indicator (spore test) showing no growth after incubation.
Biological indicators (BIs), which contain highly resistant bacterial spores (e.g., Geobacillus stearothermophilus), are the gold standard for verifying sterilisation. A successful cycle will kill these spores, and subsequent incubation will show no growth, providing direct proof of the steriliser's sporicidal efficacy. Physical and chemical indicators monitor the conditions but do not directly prove that microorganisms have been killed.
Question 3: According to the Australian Dental Association's guidelines, what is the recommended routine practice for managing dental unit waterlines (DUWLs) to minimise biofilm contamination?
- Using sterile water for all non-surgical procedures.
- Performing a 'shock' disinfection treatment of the lines annually.
- Relying on the mains water supply as it meets national drinking water standards.
- Flushing waterlines for 2 minutes at the start of the day and for 20-30 seconds between patients. (Correct answer)
Correct answer: Flushing waterlines for 2 minutes at the start of the day and for 20-30 seconds between patients.
Standard Australian guidelines recommend a routine flushing protocol to reduce the microbial load from biofilm that accumulates overnight and between patients. This involves a longer flush to clear stagnant water at the start of the day and a shorter flush to clear patient material between appointments. While other methods like chemical treatments are also used, this flushing routine is a fundamental daily practice.
Question 4: A dentist is performing a procedure involving a high-speed handpiece, which is known to generate significant aerosols. To comply with standard and transmission-based precautions in Australia, what is the minimum required Personal Protective Equipment (PPE)?
- Gloves, a fluid-resistant gown, protective eyewear or face shield, and a P2/N95 respirator. (Correct answer)
- Gloves and a standard surgical mask.
- Gloves, a standard surgical mask, and protective eyewear.
- A P2/N95 respirator and gloves only.
Correct answer: Gloves, a fluid-resistant gown, protective eyewear or face shield, and a P2/N95 respirator.
Aerosol-generating procedures (AGPs) require a high level of protection for the operator. This includes protecting the hands (gloves), body/clothing (gown), and all mucous membranes of the face (eyes, nose, mouth). For aerosols, a P2/N95 respirator is the standard of care over a surgical mask to protect the respiratory tract from inhalation of fine infectious particles.
Question 5: In the instrument reprocessing workflow, what is the primary purpose of the initial cleaning step before instruments are placed in a thermal disinfector or steriliser?
- To fix proteins to the instrument surface for easier removal later.
- To achieve high-level disinfection of the instruments.
- To physically remove bioburden such as blood, saliva, and tissue. (Correct answer)
- To apply a protective coating to prevent corrosion during sterilisation.
Correct answer: To physically remove bioburden such as blood, saliva, and tissue.
Cleaning is the most critical step in instrument reprocessing. Its function is to remove all visible organic and inorganic material (bioburden). If bioburden is not removed, it can shield microorganisms from the sterilant (e.g., steam), leading to a failure of the sterilisation process.
Question 6: Which of the '5 Moments for Hand Hygiene' specifically applies to the action of a dental practitioner cleaning their hands immediately before donning sterile gloves for a surgical extraction?
- Moment 1: Before touching a patient.
- Moment 2: Before a clean or aseptic procedure. (Correct answer)
- Moment 3: After body fluid exposure risk.
- Moment 4: After touching a patient.
Correct answer: Moment 2: Before a clean or aseptic procedure.
Moment 2, 'Before a clean or aseptic procedure', is performed to protect the patient from the transmission of harmful organisms into a sterile site or mucous membrane. Donning gloves for a surgical procedure is a classic example of this moment, as hand hygiene must be performed immediately before putting on the gloves to prevent contamination.
ADC - Australian Dental Council Infection Prevention and Control Questions and Answers
A dental assistant sustains a superficial puncture wound from a contaminated explorer during instrument reprocessing.
The patient source is unknown.
After performing immediate first aid by washing the area with soap and water, what is the most critical next step according to Australian workplace safety protocols?