Free DISIPC Practice Questions

Question 1

At a pediatric dental office, reservoir samples from one unit repeatedly contain fewer than 10 CFU/mL. Outlet samples collected before the first patient exceed 1,500 CFU/mL. A prolonged flush lowers the outlet count, but it rises again after the unit stands unused. Sample blanks are negative, and the antiretraction valve passes its function test. What mechanism best accounts for this pattern?

Accepted Answer

An established biofilm inside the tubing is shedding organisms into the outlet water.

Answer

Bacteria in the incoming supply are continually reseeding the reservoir.

Answer

Oral secretions are entering the lines through a failed antiretraction valve.

Answer

Contaminated collection materials are introducing organisms into each outlet sample.

Question 2

"The motor never enters the patient's mouth," a practice manager explains. Staff heat-sterilize a reusable nosecone between patients but only wipe the detachable, air-driven low-speed motor. Both components tolerate heat sterilization. Which processing plan corrects the gap?

Accepted Answer

Clean and heat-sterilize both parts between patients, following their instructions.

Answer

Heat-sterilize the nosecone; disinfect the motor exterior between patients.

Answer

Change the motor's barrier between patients and heat-sterilize the motor at day's end.

Answer

Clean both components and immerse them in a high-level disinfectant between patients.

Question 3

Before a service visit, a dental office decontaminates the accessible surfaces of a suction assembly. A sealed internal compartment may still contain patient material; the manufacturer confirms that it cannot be decontaminated until the service technician opens it. The technician is trained and equipped to handle contaminated equipment. Under OSHA's Bloodborne Pathogens Standard, how may the visit proceed?

Accepted Answer

Attach a biohazard label identifying the compartment and notify the technician before handling.

Answer

Certify the assembly as decontaminated because its accessible surfaces have been treated.

Answer

Provide gloves; let the technician assess contamination after opening the compartment.

Answer

Cancel servicing until every internal surface can be certified free of potentially infectious material.

Question 4

A practice receives a culture result for water used in routine, nonsurgical dental treatment. The laboratory counted 78 colonies from 0.1 mL of undiluted outlet water using an appropriate validated method. Which interpretation and follow-up fit this result?

Accepted Answer

780 CFU/mL; treat per manufacturer instructions and retest the unit.

Answer

78 CFU/mL; continue the current maintenance program.

Answer

7.8 CFU/mL; continue nonsurgical use and routine testing.

Answer

780 CFU/mL; replace all water-bearing components before attempting corrective chemical treatment.

Question 5

Reusable metal impression trays are being added to a practice's processing schedule. They contact oral mucosa without penetrating tissue, and their validated instructions permit heat sterilization. How should these trays be classified and processed under CDC dental guidance?

Accepted Answer

Semicritical; clean and heat-sterilize between patients.

Answer

Critical; clean and heat-sterilize after every patient use.

Answer

Semicritical; clean and use high-level disinfection instead of heat.

Answer

Noncritical; clean and use an intermediate-level surface disinfectant.

Question 6

Saliva from a recently used dental suction line splashes into a service technician's eye. No blood is visible, and the technician has no pain or redness. What response is required now?

Accepted Answer

Irrigate the eye immediately, report the exposure, and obtain prompt medical evaluation.

Answer

Flush the eye; obtain medical evaluation only if symptoms develop.

Answer

Test the source patient before deciding whether an exposure occurred.

Answer

Document the splash as a non-exposure unless blood is found in the suction line.

Question 7

Blood is visible on an unprotected dental light handle. Two surface-compatible EPA-registered hospital disinfectants are available: Product X has HIV/HBV claims and a 1-minute contact time but no tuberculocidal claim; Product Y has a tuberculocidal claim and a 3-minute contact time. The handle is needed again in 2 minutes. Select the defensible plan.

Accepted Answer

Clean the handle, use Y for its full wet contact time, and delay reuse.

Answer

Clean, then keep X wet for its labeled 1 minute.

Answer

Remove the blood, then keep X wet for 3 minutes to achieve the needed intermediate-level disinfection.

Answer

Clean, apply Y for 2 minutes, then dry and rebarrier.

Question 8

A distributor is reorganizing storage for concentrated cleaners and waterline-treatment chemicals. Before approving a shared cabinet, the safety coordinator needs the recommended storage conditions and the substances that can react dangerously with each product. Which pair of Safety Data Sheet sections most directly answers those questions?

Accepted Answer

Sections 7 and 10: handling and storage; stability and reactivity.

Answer

Sections 2 and 8: hazard identification; exposure controls and personal protection.

Answer

Sections 4 and 6: first aid; accidental release measures.

Answer

Sections 11 and 13: toxicological information and waste disposal considerations.

Question 9

During a sharps-safety review, staff describe frequent two-handed recapping. The manager wants to add an engineering control, not merely change staff technique or issue additional PPE. Which proposal meets that objective?

Accepted Answer

Introduce a compatible needle device with an integrated protective mechanism.

Answer

Require a one-handed scoop whenever a dental procedure makes recapping necessary.

Answer

Provide additional hands-on recapping training and observe competency before employees resume handling syringes.

Answer

Require two pairs of examination gloves during procedures involving local anesthetic needles.

Question 10

A steam sterilizer was removed from service after its first positive biological indicator. Mechanical and chemical monitors were satisfactory, no implants were involved, and review found the operating procedures correct. An immediate repeat spore test using the same cycle is negative; the matching unprocessed control grows as expected. Which action follows CDC's dental monitoring recommendations?

Accepted Answer

Return the sterilizer to service and continue its scheduled monitoring program.

Answer

Require three consecutive fully loaded negative challenge cycles before allowing any further use.

Answer

Arrange equipment repair despite the satisfactory repeat test.

Answer

Recall every nonimplantable item from suspect loads before restarting.

Free DISIPC Practice Questions

Domain 1: Regulatory and Occupational Safety 15% of exam

Question 1

Question 2

Domain 2: Prevention of Disease Transmission 45% of exam

Question 3

Question 4

Question 5

Question 6

Domain 3: Infection Control Protocols 40% of exam

Question 7

Question 8

Question 9

Question 10

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