Infection Control Practice Questions
Infection control questions are among the most predictable on dental board exams, and among the most frustrating to miss. This set covers standard precautions and PPE, instrument processing, sterilisation methods and monitoring, disinfection, dental unit waterlines, regulated waste and sharps management, bloodborne pathogen exposure and occupational health. The AFK, INBDE, ORE and ADC all expect you to know the correct sequence and the reason behind it: why an instrument is classed as critical, which sterilisation method suits a heat-sensitive item, and what to do immediately after a needlestick injury.
10 questions · answers and explanations revealed as you go · no sign-up
Questions
Question 1 of 10
Disinfection
A team member assumes wiping an operatory surface with an intermediate-level disinfectant will destroy bacterial spores on that surface. Why is this assumption incorrect?
The answer is A.
Intermediate-level disinfectants are tuberculocidal and effective against a broad range of vegetative bacteria, fungi, and many viruses, but they are not formulated or validated to reliably destroy bacterial spores. Only sterilization or specific high-level/sporicidal processes are relied upon when spore destruction is required.
Question 2 of 10
Dental Unit Waterline Management
For a surgical procedure involving exposure of bone or subcutaneous tissue, what water source should be used for irrigation instead of standard dental unit waterline output?
The answer is C.
Because standard dental unit waterlines cannot be reliably guaranteed sterile even after flushing and treatment, surgical procedures exposing bone or normally sterile tissue require sterile water or saline delivered through sterile devices such as a bulb syringe or dedicated sterile delivery system, not routine unit waterline output.
Question 3 of 10
Sterilization Methods
After a sterilization cycle, the autoclave printout shows the temperature never reached the programmed setpoint. What should the team conclude about that load?
The answer is D.
A mechanical indicator (printout, gauge, or digital readout) that shows a cycle parameter was not met is direct physical evidence the sterilization conditions were not achieved. Regardless of elapsed time or packaging appearance, that load must be considered unprocessed and reprocessed correctly.
Question 4 of 10
Bloodborne Pathogen Exposure
Following an occupational exposure, exposure incident records for the affected employee should be:
The answer is C.
Exposure incident and medical records contain sensitive health information and are maintained confidentially, typically stored separately from general personnel files with restricted access, consistent with standard practices for protecting employee medical information.
Question 5 of 10
Regulated Waste & Sharps Management
A gauze pad lightly used to blot a small amount of saliva, not saturated or dripping, needs to be discarded. How is this item typically classified?
The answer is B.
Waste classification generally hinges on whether an item is saturated with blood or saliva or would release fluid if compressed. A lightly soiled item that is not saturated and poses minimal risk of fluid release is typically managed as general waste rather than regulated medical waste, distinguishing routine clinical waste from true biohazardous material.
Question 6 of 10
Standard Precautions & PPE
During a long appointment involving multiple aerosol-generating steps, when should the surgical mask be changed?
The answer is C.
Masks lose their filtration effectiveness once they become moist from breathing or splatter, so they should be changed between patients and any time during a procedure that the mask becomes wet or visibly contaminated, not left in place based on a fixed weekly schedule.
Question 7 of 10
Instrument Processing Workflow
A local anesthetic needle labeled for single-patient use has been used on one patient. What should happen to it afterward?
The answer is A.
Single-use items are manufactured and validated for one use only and are not designed to withstand or be effective after reprocessing. They must be discarded appropriately, typically into a sharps container if applicable, after use on a single patient rather than sterilized or reused in any way.
Question 8 of 10
Occupational Health
A dental hygienist has not received a Tdap booster in over ten years and works closely with pediatric patients. What vaccination consideration applies?
The answer is C.
Protection from pertussis-containing vaccines wanes over time, so a Tdap booster is recommended periodically for healthcare personnel, particularly those in close, frequent contact with patients, to maintain protection against pertussis and reduce the risk of transmission in a clinical setting.
Question 9 of 10
Dental Unit Waterline Management
A dental unit uses an independent (bottled) water reservoir system instead of direct municipal line connection. What advantage does this provide for water quality management?
The answer is B.
An independent water reservoir system lets the practice control what enters the waterlines, including using specially formulated water or chemical treatment products designed to inhibit biofilm formation, offering more direct control over water quality than relying solely on municipal supply and building plumbing.
Question 10 of 10
Standard Precautions & PPE
A protective clinical gown becomes visibly soaked with fluid during a procedure. What should the clinician do?
The answer is A.
Protective gowns are meant to prevent fluid from reaching skin and clothing underneath, but once a gown becomes visibly soaked through, its barrier function is compromised. It should be changed for a fresh one to maintain effective protection rather than continuing to rely on a saturated garment.
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