Free DANB ICE Practice Test: 75 Questions With Answers

Correct answer: D. Indirect contact through a contaminated object or surface

CDC describes indirect contact transmission as transfer through a contaminated intermediate object or surface. The contaminated light handle and gloves can carry microorganisms to the clean package; this is why clean and contaminated zones and glove changes matter during patient care.

Source: CDC — Guidelines for Infection Control in Dental Health-Care Settings — 2003 — Background — Modes of Transmission; indirect contact

Correct answer: B. A needlestick from a used anesthetic needle while you disassemble the syringe

An exposure incident is a specific eye, mouth, other mucous membrane, non-intact skin or parenteral contact with blood or OPIM during your duties. A needlestick is parenteral contact (piercing the skin). Saliva on intact skin should still be washed off, but intact skin is not on the list. A cough blocked by PPE and a clean sterile pouch involve no qualifying contact.

Source: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (b) Definitions — 'Exposure Incident', 'Parenteral'

Correct answer: C. Nothing — the same Standard Precautions are used for every patient

CDC describes Standard Precautions as the minimum practices for all patient care, regardless of a patient's suspected or confirmed infection status. They are designed to be enough for bloodborne infections such as hepatitis C, so her care doesn't need special scheduling or a delay. High-level disinfectants are never used on environmental surfaces.

Sources: CDC — Standard Precautions (dental summary) — Background; CDC — Best Practices for Environmental Infection Prevention and Control — Choosing the right product

Correct answer: B. Offer the patient a mask and encourage them to sit as far from others as possible

CDC's respiratory hygiene measures start at the point of entry: offer masks to coughing patients, provide tissues and no-touch disposal, make hand hygiene supplies available, and seat symptomatic people as far from others as possible. Masks are not reserved for staff, and a mouth rinse doesn't contain coughs or sneezes.

Source: CDC — Standard Precautions (dental summary) — Respiratory hygiene/cough etiquette — Key Recommendations 1.d–1.e

Correct answer: A. A surgical hand scrub (surgical hand antisepsis)

For routine exams and nonsurgical procedures, CDC accepts plain soap and water, antimicrobial soap or an alcohol-based hand rub. For surgical procedures — CDC's definition includes extractions that require elevating a flap — a surgical hand scrub comes before sterile surgeon's gloves. Gloves never replace hand hygiene, and follow the hand-hygiene product's label.

Source: CDC — Standard Precautions (dental summary) — Hand hygiene; footnote A (oral surgical procedures)

Correct answer: C. Perform hand hygiene right away

CDC lists barehanded touching of instruments or equipment likely to be contaminated with blood, saliva or respiratory secretions as a time to perform hand hygiene. Gloves put on later don't clean contaminated hands, and surface disinfectants are made for surfaces, not skin.

Source: CDC — Standard Precautions (dental summary) — Hand hygiene — Key Recommendation 1.b

Correct answer: C. Immediately or as soon as feasible after removing the gloves

OSHA requires employers to make sure employees wash their hands immediately or as soon as feasible after removing gloves or other PPE. CDC says the same: perform hand hygiene immediately after removing gloves. Gloves can have tiny defects, and hands can be contaminated while gloves come off, so the rule applies even when the gloves look intact.

Sources: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (d)(2)(v); CDC — Standard Precautions (dental summary) — Personal protective equipment — Key Recommendation 3.c

Correct answer: D. Perform hand hygiene again, then put on gloves

CDC calls for hand hygiene before and after treating each patient and before putting on gloves. Charts, keyboards and phones aren't clean, so your morning hand hygiene doesn't carry over. Double gloving and rinsing gloves are not substitutes, and CDC says not to wash gloves.

Source: CDC — Standard Precautions (dental summary) — Hand hygiene — Key Recommendations 1.c–1.d; Personal protective equipment — 3.b

Correct answer: B. A mask combined with goggles or glasses with solid side shields, or a chin-length face shield

OSHA requires masks in combination with eye protection — goggles or glasses with solid side shields — or chin-length face shields whenever splashes, spray, spatter or droplets of blood or OPIM may be generated. Ordinary prescription glasses lack side protection, and a mask or glasses alone leaves either the eyes or the nose and mouth exposed.

Sources: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (d)(3)(x); CDC — Standard Precautions (dental summary) — Personal protective equipment — Key Recommendation 5

Correct answer: A. Discard them and use a new pair

Utility gloves can be decontaminated for reuse only while the glove is intact. OSHA says they must be discarded when they are cracked, peeling, torn, punctured or otherwise no longer work as a barrier. Tape or an extra layer doesn't restore a damaged barrier.

Source: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (d)(3)(ix)(C)

Correct answer: A. Hand hygiene

CDC states that hand hygiene is always the final step after removing and disposing of PPE. Hands can pick up contamination as PPE comes off, even when you're careful. The other tasks may come next, but only after your hands are clean.

Source: CDC — Standard Precautions (dental summary) — Personal protective equipment

Correct answer: D. Keep your hands away from your face and limit the surfaces you touch

CDC's PPE training points include keeping hands away from the face, limiting the surfaces touched, removing PPE when leaving work areas and performing hand hygiene. Touching your mask with contaminated gloves moves saliva toward your nose and mouth, and wiping gloves on a gown doesn't decontaminate them. If PPE needs fixing, step away and change it safely.

Source: CDC — Standard Precautions (dental summary) — Personal protective equipment

Correct answer: B. PPE must be removed before leaving the work area and placed in a designated area or container

OSHA requires all PPE to be removed before leaving the work area and placed in a designated area or container for storage, washing, decontamination or disposal. A gown can carry contamination you can't see, so 'not visibly soiled' doesn't make it safe to wear into a break room. CDC repeats this rule in its PPE recommendations.

Sources: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (d)(3)(vii)–(viii); CDC — Standard Precautions (dental summary) — Personal protective equipment — Key Recommendation 6

Correct answer: A. A dental dam and high-velocity (high-volume) evacuation

CDC's 2003 dental guidelines name the use of dental dams and high-velocity air evacuation as work practices that should minimize the spread of droplets, spatter and aerosols. A dental dam isolates the tooth from saliva, and the high-volume evacuator captures spray at its source. A saliva ejector is a low-volume device, and the air-water syringe creates spray rather than removing it.

Source: CDC — Guidelines for Infection Control in Dental Health-Care Settings — 2003 — Personal Protective Equipment — dental dams and high-velocity air evacuation

Correct answer: D. Reschedule the nonurgent care until he is no longer infectious

Chickenpox, measles and tuberculosis call for airborne precautions, and CDC notes that dental settings usually aren't designed to carry them out. CDC suggests rescheduling nonurgent care until the patient is no longer infectious, or referring the patient to a setting with appropriate precautions when care is urgent. Standard Precautions alone don't cover airborne spread.

Source: CDC — Standard Precautions (dental summary) — Background (Transmission-Based Precautions)

Correct answer: B. Debris and organic matter can shield microorganisms and make disinfection fail

CDC calls cleaning the necessary first step of any disinfection process. Blood, saliva and other debris can protect microorganisms from the disinfectant, so skipping cleaning can compromise disinfection. Contact time comes from the product label and isn't shortened by cleaning.

Sources: CDC — Best Practices for Environmental Infection Prevention and Control — Types of decontamination; CDC — Sterilization and Disinfection (dental summary) — Environmental infection prevention and control

Correct answer: B. The dental light handle

Clinical contact surfaces are likely to be contaminated by spray, spatter or gloved hands during care — light handles, bracket trays, unit switches and computer equipment are CDC's examples. Floors, walls and sinks are housekeeping surfaces, which don't contact patients or the devices used on them.

Source: CDC — Best Practices for Environmental Infection Prevention and Control — Clinical contact surfaces; Housekeeping surfaces

Correct answer: C. With soap and water, because it is a housekeeping surface

Housekeeping surfaces such as floors, walls and sinks carry a limited risk of disease transmission. CDC says they can be cleaned with soap and water, or cleaned and disinfected if visibly contaminated with blood. High-level disinfectants should never be used on environmental surfaces.

Source: CDC — Best Practices for Environmental Infection Prevention and Control — Housekeeping surfaces; Choosing the right product

Correct answer: D. Clean it, then disinfect it

Soap and water is enough for routine housekeeping cleaning, but CDC says a housekeeping surface that is visibly contaminated with blood should be cleaned and then disinfected. OSHA also requires work surfaces to be decontaminated immediately or as soon as feasible after a spill of blood or OPIM. Covering the blood leaves the contamination in place.

Sources: CDC — Best Practices for Environmental Infection Prevention and Control — Housekeeping surfaces; OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (d)(4)(ii)(A)

Correct answer: D. An EPA-registered, low-level hospital disinfectant effective against HIV and HBV

When a clinical contact surface isn't barrier-protected, CDC says to clean it and then disinfect it with an EPA-registered low-level hospital disinfectant that is effective against HIV and HBV. Step up to an intermediate-level (tuberculocidal) product when the surface is visibly contaminated with blood. High-level disinfectants are never for surfaces, and hand rubs are made for skin.

Source: CDC — Best Practices for Environmental Infection Prevention and Control — Clinical contact surfaces; Choosing the right product

Correct answer: A. The ability to kill TB bacteria is a benchmark for broad germ-killing strength

Mycobacteria are among the most resistant microorganisms, so a product that kills them is considered able to kill a broad range of less resistant pathogens, including hepatitis B and C viruses and HIV. CDC is clear that using these products on surfaces plays no role in preventing TB, which is airborne.

Source: CDC — Best Practices for Environmental Infection Prevention and Control — Frequently asked questions — tuberculocidal claim

Correct answer: A. High-level disinfectants are toxic and should never be used on environmental surfaces

CDC says high-level disinfectants such as glutaraldehyde are used as chemical sterilants and, because of their toxicity, should never be used on environmental surfaces. Surfaces get EPA-registered low- or intermediate-level hospital disinfectants instead, chosen by the level of contamination.

Source: CDC — Best Practices for Environmental Infection Prevention and Control — Choosing the right product

Correct answer: B. Only if its label says the product is suitable for cleaning

CDC says disinfectant products should not be used as cleaners unless the label indicates they are suitable for that use. Products labeled as detergent/disinfectants can do both jobs; others can't. Either way, follow the label's amount, dilution, contact time and safe-use directions rather than improvising.

Source: CDC — Sterilization and Disinfection (dental summary) — Environmental infection prevention and control; Key Recommendation 3

Correct answer: B. Prepare cleaning and disinfecting solutions fresh daily, following the manufacturer's directions

CDC advises preparing fresh cleaning and disinfecting solutions daily and according to the manufacturer's recommendations. Old or improperly mixed dilutions may not work as the label claims, and topping off an old batch just mixes the problem in.

Sources: CDC — Best Practices for Environmental Infection Prevention and Control — Housekeeping surfaces; CDC — Sterilization and Disinfection (dental summary) — Environmental — Key Recommendation 3

Correct answer: A. Clinical contact surfaces that are hard to clean, such as chair switches and computer equipment

CDC recommends surface barriers for clinical contact surfaces, particularly those that are difficult to clean, and says to change them between patients. Hard-to-clean surfaces are where barriers save the most risk; floors, walls and reception furniture are housekeeping surfaces.

Sources: CDC — Sterilization and Disinfection (dental summary) — Environmental — Key Recommendation 1.a; CDC — Best Practices for Environmental Infection Prevention and Control — Clinical contact surfaces

Correct answer: B. Clean it and disinfect it with an EPA-registered hospital disinfectant after each patient

CDC's rule is barrier-protect or clean-and-disinfect: clinical contact surfaces that aren't barrier-protected should be cleaned and disinfected with an EPA-registered hospital disinfectant after each patient, using an intermediate-level product if blood is visible. End-of-day or weekly disinfection leaves contamination in place for the next patient.

Source: CDC — Sterilization and Disinfection (dental summary) — Environmental — Key Recommendation 1.b

Correct answer: C. Use the needle and cartridge for that patient only, then clean and heat-sterilize the cartridge syringe before another patient

CDC's safe injection guidance says needles and anesthetic cartridges are used for one patient only, and the dental cartridge syringe is cleaned and heat-sterilized between patients. Leftover solution in a used cartridge can't be shared, because the cartridge may have been contaminated during the injection.

Source: CDC — Standard Precautions (dental summary) — Safe injection practices; footnote C

Correct answer: A. Dedicate it to that patient and discard it after use

CDC says multidose vials used for more than one patient should stay in a centralized medication area and should not enter the immediate treatment area. If one does enter the operatory, it should be dedicated to that single patient and discarded right after use. The 28-day rule is about dating opened vials, not about sharing a contaminated one.

Source: CDC — Standard Precautions (dental summary) — Safe injection practices — Key Recommendation 8.b–8.d

Correct answer: B. Enter the vial with a new needle and a new syringe, even though it's the same patient

CDC says medication containers are entered with a new needle and a new syringe, even when you are getting additional doses for the same patient. A used syringe can contaminate the vial, which may then be used again. Leaving a needle in the septum creates an open path into the vial.

Source: CDC — Standard Precautions (dental summary) — Safe injection practices — Key Recommendation 4

Correct answer: D. It may not be suitable for use on more than one patient

CDC says to clean and reprocess reusable dental equipment according to the manufacturer's instructions and that a device without such instructions may not be suitable for multi-patient use. Guessing at a method could damage the device or leave it unsafe, so check with the manufacturer.

Source: CDC — Sterilization and Disinfection (dental summary) — Key Recommendations for sterilization and disinfection — 2

Correct answer: B. Follow the monitoring recommendations from the manufacturer of the dental unit or waterline treatment product

CDC recommends following the water-quality monitoring recommendations from the manufacturer of the unit or the waterline treatment product. Bacteria and biofilm aren't visible in the water, flushing alone doesn't prove the treatment works, and a single test at installation says nothing about the water months later.

Source: CDC — Dental Unit Water Quality (dental summary) — Key Recommendations 2–3

Correct answer: D. No — reservoirs alone aren't enough; the water still needs treatment to meet drinking-water standards

CDC says all dental units should use systems that treat water to meet drinking-water standards (500 CFU/mL or less of heterotrophic water bacteria) and that independent reservoirs alone are not sufficient. The narrow tubing still grows biofilm, so the waterline needs a treatment method and monitoring.

Source: CDC — Dental Unit Water Quality (dental summary) — About dental unit water quality; Key Recommendation 1

Correct answer: D. Through a sterile device, such as a sterile bulb syringe or sterile tubing that bypasses the dental unit waterlines

For surgical procedures, CDC calls for sterile solutions delivered with an appropriate device: a sterile bulb syringe, sterile tubing that bypasses the waterlines, or sterile single-use devices. Water that travels through the unit's lines — even sterile water poured into the reservoir — isn't sterile when it comes out.

Source: CDC — Dental Unit Water Quality (dental summary) — About dental unit water quality; Key Recommendation 4

Correct answer: C. Gloves, appropriate protective clothing, and a mask with eye protection (or appropriate face shield)

The trap holds material suctioned from patients' mouths, including saliva and blood. OSHA requires gloves when handling contaminated items, appropriate protective clothing when occupational exposure is anticipated, and face protection when splashes, spray, spatter or droplets of blood or OPIM may reach the face.

Source: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (d)(3)(ix)–(xi)

Correct answer: A. A blood pressure cuff

Noncritical items touch only intact skin; CDC's examples are the radiograph head/cone, blood pressure cuff and facebow. Mouth mirrors and amalgam condensers touch mucous membranes, so they're semicritical. Periodontal scalers penetrate soft tissue, so they're critical.

Source: CDC — Sterilization and Disinfection (dental summary) — Classifications

Correct answer: D. Cleaning (or a disposable barrier), with disinfection added if it is visibly soiled

For noncritical items like a facebow, CDC says cleaning — or cleaning followed by disinfection with an EPA-registered hospital disinfectant if visibly soiled — is adequate in most cases, and disposable barriers may be preferred. Heat sterilization and high-level disinfection are for critical and semicritical items, and 'only touches skin' still means it needs cleaning.

Source: CDC — Sterilization and Disinfection (dental summary) — Classifications — noncritical items

Correct answer: A. Clean and disinfect it using a method compatible with the material

CDC says dental prostheses and appliances delivered to a patient should be free of contamination, and the laboratory and dental office should communicate about who performs final disinfection. If the laboratory documents that it disinfected the item, duplicate disinfection may not be necessary. With no such documentation, the dental office is responsible for cleaning and disinfecting it before placement, using a material-compatible method.

Source: CDC — Guidelines for Infection Control in Dental Health-Care Settings — 2003 — Dental Laboratory — communication and final disinfection of prostheses/appliances

Correct answer: C. Gauze saturated with blood

CDC says most soiled items in dental offices — used gloves, masks, gowns and lightly soiled gauze or cotton rolls — are general medical waste. Items like blood-soaked gauze, extracted teeth and used needles are regulated medical waste. OSHA defines regulated waste to include items that would release blood or OPIM if compressed.

Sources: CDC — Best Practices for Environmental Infection Prevention and Control — Disposing of medical waste; OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (b) Definitions — 'Regulated Waste'

Correct answer: D. Into a sharps container

OSHA's definition of contaminated sharps specifically includes exposed ends of dental wires. Contaminated sharps must be discarded in containers that are closable, puncture resistant, leakproof on the sides and bottom, and labeled or color-coded. A bag can't stop a wire end from poking through.

Source: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (b) Definitions — 'Contaminated Sharps'; (d)(4)(iii)(A)(1)

Correct answer: B. Close it and replace it before it overfills

OSHA requires sharps containers to be kept upright, replaced routinely, not allowed to overfill, and closed right before removal. Pushing contents down or emptying a container by hand invites exactly the needlestick it's meant to prevent.

Source: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (d)(4)(iii)(A)(2)–(4)

Correct answer: B. Don't heat-sterilize them; immersion in 10% formalin for 2 weeks has been an effective disinfection method

Heat sterilization is preferred for teeth without amalgam, but CDC says teeth containing amalgam should not be heat-sterilized because of possible mercury vaporization. Immersing them in 10% formalin for 2 weeks has been effective. Formalin is a formaldehyde solution, so review its safety data sheet and follow OSHA's Hazard Communication rules when using it.

Source: CDC — Best Practices for Handling Extracted Teeth — Extracted teeth in educational settings

Correct answer: D. In a covered container that is puncture-resistant and leak-proof, with as little handling as possible

CDC's safety practices say to minimize handling of loose contaminated instruments and to carry them in a covered, puncture-resistant, leak-proof container. OSHA has the same requirements for contaminated reusable sharps waiting to be reprocessed. Open trays and bare bundles risk spills and sharps injuries.

Sources: CDC — Best Practices for Sterilization in Dental Settings — Safety practices; OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (d)(2)(viii)

Correct answer: A. Items move one way, from contaminated (receiving and cleaning) to clean (packaging) to sterile (sterilization and storage)

CDC's sterilization training describes a workflow in which instruments flow clearly from high-contamination areas to clean and sterile areas. One-way flow keeps processed items from meeting contaminated ones. Cleaning must come before packaging, and a towel isn't a separation between dirty and sterile work.

Sources: CDC — Best Practices for Sterilization in Dental Settings — Education and training (workflow pattern); CDC — Best Practices for Sterilization in Dental Settings — Cleaning; Packaging

Correct answer: C. It can be more efficient and safer, reducing workers' handling of sharp contaminated instruments

CDC says automated cleaning equipment can be more efficient and safer than manual cleaning and helps decrease worker exposure to blood. Cleaning only removes debris — it doesn't sterilize — so instruments still need packaging and sterilization, and PPE is still required during processing.

Sources: CDC — Best Practices for Sterilization in Dental Settings — Cleaning; CDC — Sterilization and Disinfection (dental summary) — Process

Correct answer: C. Let them dry thoroughly, then inspect and package them

CDC says instruments should dry thoroughly before packaging because wet instruments can compromise the packaging material and its ability to keep items sterile. Once dry, they are inspected and then wrapped, packaged or placed in containers. Surface disinfectant isn't a drying agent and leaves residue.

Source: CDC — Best Practices for Sterilization in Dental Settings — Packaging

Correct answer: A. Use a product FDA has cleared as a sterilant and follow the manufacturer's directions for dilution, immersion time, temperature and disposal exactly

CDC discourages heat-sensitive semicritical items when heat-tolerant or disposable alternatives exist. When one must be used, it is sterilized or high-level disinfected with a liquid chemical germicide cleared by FDA as a sterilant. These products are highly toxic, so the manufacturer's directions and safety precautions must be followed precisely. Surface disinfectants are EPA-regulated and aren't made for this.

Sources: CDC — Best Practices for Sterilization in Dental Settings — Special considerations; CDC — Best Practices for Environmental Infection Prevention and Control — Frequently asked questions — who regulates disinfectants

Correct answer: D. Replace it with a heat-tolerant or disposable alternative; if none exists, use at least high-level disinfection

Most semicritical dental items tolerate heat, so CDC says they should be heat-sterilized. If an item is heat-sensitive, CDC's first step is to replace it with a heat-tolerant or disposable alternative; if none is available, it must at minimum be high-level disinfected. Low-level disinfection and barriers alone are not enough for items that contact mucous membranes.

Source: CDC — Sterilization and Disinfection (dental summary) — Classifications — semicritical items

Correct answer: C. Critical — heat-sterilize it

Critical items penetrate soft tissue or bone, and CDC uses surgical instruments and periodontal scalers as examples. They carry the greatest risk of transmitting infection and should always be heat-sterilized.

Sources: CDC — Sterilization and Disinfection (dental summary) — Classifications — critical items; CDC — Best Practices for Sterilization in Dental Settings — Instrument classification

Correct answer: A. Immersion in liquid glutaraldehyde

CDC lists steam autoclaves, dry heat and unsaturated chemical vapor as heat sterilization methods. Liquid chemical sterilants such as glutaraldehyde are a separate, non-heat method reserved for heat-sensitive items.

Source: CDC — Best Practices for Environmental Infection Prevention and Control — Types of decontamination

Correct answer: A. The sterilizer used, the cycle or load number, the date of sterilization and the expiration date if applicable

CDC lists the sterilizer used, cycle or load number, sterilization date and, if applicable, expiration date as minimum label information. Those details let the office find and recall items if a sterilizer or processing failure is discovered later.

Sources: CDC — Best Practices for Sterilization in Dental Settings — Labeling; CDC — Sterilization and Disinfection (dental summary) — Process

Correct answer: B. Packaging that doesn't suit the sterilization method can cause sterilization to fail

CDC lists selecting the wrong packaging material for the sterilization method as one cause of sterilization failure. Packaging must let the sterilizing agent reach the instruments and then keep them sterile, so follow the instructions for the item, the packaging and the sterilizer.

Sources: CDC — Best Practices for Sterilization Monitoring in Dental Settings — Sterilization failures — What causes a sterilization failure?; CDC — Best Practices for Sterilization in Dental Settings — Packaging

Correct answer: C. Overloading can cause sterilization to fail

CDC names improper loading or overloading of the sterilizer as a cause of sterilization failure. Steam or heat has to reach every surface, which a packed chamber prevents. Running a longer cycle than the manufacturer specifies isn't a validated fix — follow the sterilizer manufacturer's loading instructions and parameters.

Sources: CDC — Best Practices for Sterilization Monitoring in Dental Settings — Sterilization failures — What causes a sterilization failure?; CDC — Best Practices for Sterilization in Dental Settings — Sterilization process

Correct answer: B. Don't use the instruments; reprocess them

CDC says to inspect chemical indicators when removing packages and not to use the instruments if the appropriate color change didn't occur. The internal indicator shows whether the sterilizing agent reached the instruments inside, so a changed outer tape doesn't settle it, and a passed spore test last week says nothing about this load.

Sources: CDC — Best Practices for Sterilization Monitoring in Dental Settings — Chemical monitoring; CDC — Sterilization and Disinfection (dental summary) — Monitoring

Correct answer: A. In covered or closed cabinets, away from places where they could get wet

CDC says sterile instruments and supplies should ideally be stored in covered or closed cabinets and not under sinks or anywhere they might get wet. A wet, torn or punctured package is compromised and its contents must be reprocessed.

Source: CDC — Best Practices for Sterilization in Dental Settings — Storage

Correct answer: D. Unwrapped sterilization is for limited immediate-use situations, not routine storage; storing unwrapped semicritical instruments is discouraged

CDC permits unwrapped sterilization only under specific conditions for items that will be used immediately or within a short time. It should not be used for convenience or simply to save time, and storage of unwrapped semicritical instruments is discouraged because exposure to dust and airborne organisms can contaminate them.

Source: CDC — Best Practices for Sterilization in Dental Settings — Unwrapped Sterilization; Storage — Unwrapped Instruments

Correct answer: D. For every sterilizer load

CDC says mechanical monitoring should be done for every load. Because time, temperature and pressure can be watched during the cycle, they may be the first sign of a problem, and packages from a cycle that didn't reach the required parameters shouldn't be used.

Source: CDC — Best Practices for Sterilization Monitoring in Dental Settings — Mechanical monitoring

Correct answer: C. Run a spore test with that load and, ideally, hold the implant until the test is negative

CDC recommends spore testing at least weekly for every sterilizer and also for every load that contains an implantable device. Ideally, implantable items aren't used until that spore test comes back negative. Chemical indicators and repeated cycles don't directly show that resistant microorganisms were killed.

Source: CDC — Best Practices for Sterilization Monitoring in Dental Settings — Biological monitoring

Correct answer: C. It reacts to two or more parameters, such as time and temperature, so it gives a more reliable indication

A single-parameter indicator responds to only one condition, such as temperature. CDC says multiparameter indicators react to two or more and give a more reliable indication that sterilization conditions were met. No chemical indicator guarantees sterility or replaces spore testing, and internal indicators belong inside every package.

Source: CDC — Sterilization and Disinfection (dental summary) — Monitoring (note on single- and multiparameter indicators)

Correct answer: A. Biological monitoring (a spore test)

CDC calls spore tests the most accepted method for monitoring sterilization because they assess the process directly by killing known, highly resistant microorganisms. Mechanical and chemical indicators help catch errors and malfunctions, but they don't guarantee sterilization.

Sources: CDC — Sterilization and Disinfection (dental summary) — Monitoring; CDC — Best Practices for Sterilization Monitoring in Dental Settings — Biological monitoring

Correct answer: C. Keep the sterilizer out of service until it's inspected or repaired and passes spore tests in three consecutive fully loaded cycles

After a second positive, CDC says to keep the sterilizer out of service until it has been inspected or repaired and re-challenged with spore tests in three consecutive fully loaded cycles. When possible, items from suspect loads back to the last negative spore test should be recalled, rewrapped and re-sterilized.

Source: CDC — Best Practices for Sterilization Monitoring in Dental Settings — What should I do if there's a positive spore test?

Correct answer: B. A self-sheathing anesthetic needle

Engineering controls isolate or remove the hazard — OSHA's examples include sharps disposal containers, self-sheathing needles and other safer devices. A rule changing how a task is done is a work practice control, gloves are PPE, and training is a separate requirement.

Sources: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (b) Definitions — 'Engineering controls', 'Work Practice Controls'; CDC — Standard Precautions (dental summary) — Sharps safety

Correct answer: D. Use a mechanical device or a one-handed technique

OSHA generally prohibits bending, recapping or removing contaminated needles. When an exception applies because no alternative is feasible or a specific medical or dental procedure requires the action, removal or recapping must be done with a mechanical device or a one-handed technique.

Source: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (d)(2)(vii)(A)–(B)

Correct answer: B. Treat it as an infection-control lapse: stop and correct the practice, then evaluate the risk to affected patients using CDC breach guidance

CDC says removable dental handpieces should be cleaned and heat-sterilized between patients; surface disinfection is not an acceptable reprocessing method. CDC's dental program-evaluation guidance says identified infection-control lapses should be corrected and the risk posed to patients should be assessed, with consultation/notification escalated when the lapse warrants it.

Sources: CDC — Best Practices for Dental Handpieces — Key points; Background; CDC — Administrative Considerations — Risk assessment — infection-control lapses and patient-risk evaluation

Correct answer: A. Wash the area with soap and water, then report the exposure right away

OSHA requires washing skin with soap and water immediately or as soon as feasible after contact with blood or OPIM. After an exposure incident, the employer must make an immediate, confidential medical evaluation and follow-up available, so the exposure needs to be reported promptly through the practice's exposure procedure.

Source: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (d)(2)(vi); (f)(3)

Correct answer: C. Preserve the sample for at least 90 days so it can be tested if she consents later

Under OSHA's post-exposure rules, if the employee consents to baseline blood collection but not yet to HIV testing, the sample must be preserved for at least 90 days. If she decides within 90 days of the exposure to have it tested, testing is done as soon as feasible. The rest of the evaluation, which the employer provides at no cost, continues.

Source: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (f)(3)(iii)(B); (f)(1)(ii)(A)

Correct answer: D. As long as state and local regulations require

CDC says to keep mechanical, chemical and biological monitoring records long enough to comply with state and local regulations. Records matter even when everything passed — if a sterilizer problem turns up later, they help determine whether an instrument recall is needed.

Source: CDC — Best Practices for Sterilization Monitoring in Dental Settings — Sterilization records

Correct answer: C. At initial assignment, then at least annually, within one year of the previous training

OSHA requires training at the time of initial assignment to tasks with occupational exposure and at least annually after that, with each annual session within one year of the last. It must be free and during working hours, and additional training is required when tasks change in ways that affect exposure.

Source: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (g)(2)(i)–(v)

Correct answer: D. 3 years from the date of the training

OSHA requires training records — dates, contents or summary, trainer names and qualifications, and attendee names and job titles — to be kept for 3 years from the training date. Employment plus 30 years is the rule for employee medical records, a different category.

Source: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (h)(2)(i)–(ii)

Correct answer: A. Make the vaccine available at no cost

OSHA allows an employee to decline hepatitis B vaccination initially, but if that employee later requests vaccination while still covered by the standard, the employer must make it available at no cost. The signed declination does not permanently waive the employee’s right to receive the vaccine later.

Source: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (f)(2)(iii)–(iv)

Correct answer: B. For the duration of employment plus 30 years

OSHA requires the medical records it describes — vaccination status, post-exposure results and the healthcare professional's written opinion — to be kept for at least the duration of employment plus 30 years. They must be kept confidential and not disclosed without the employee's written consent except as required by law.

Source: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (h)(1)(ii)–(iv)

Correct answer: C. Section 4

OSHA's Hazard Communication Standard sets a fixed SDS order. Section 4 is First-aid measures. Section 2 is Hazard(s) identification, Section 8 is Exposure controls/personal protection, and Section 11 is Toxicological information. Knowing the order lets you find emergency steps fast.

Source: OSHA — 29 CFR 1910.1200 Appendix D, Safety Data Sheets — Section 4 — First-aid measures

Correct answer: C. Readily accessible to employees in their work areas during every shift; electronic access is allowed if it creates no barriers

OSHA requires employers to keep SDSs for each hazardous chemical in the workplace and make them readily accessible to employees in their work areas during each work shift. Electronic access is permitted only if it doesn't create barriers to immediate access. A locked drawer or another building fails that test.

Source: OSHA — 29 CFR 1910.1200, Hazard Communication — (g)(8)

Correct answer: B. Label the bottle with the product identifier and hazard information

Workplace containers must be labeled with either the full shipped-container label information or the product identifier plus words, pictures or symbols giving general hazard information. The labeling exemption covers only portable containers for the immediate use of the person who transferred the chemical, within that shift. A bottle shared all week doesn't qualify, and 'cleaner' identifies neither the product nor its hazards.

Source: OSHA — 29 CFR 1910.1200, Hazard Communication — (c) Definitions — 'Immediate use'; (f)(6); (f)(8)

Correct answer: A. The Environmental Protection Agency (EPA)

CDC explains that EPA regulates the low- and intermediate-level disinfectants used on environmental surfaces, while FDA regulates liquid chemical sterilants and high-level disinfectants used on heat-sensitive semicritical devices. CDC writes recommendations but doesn't register products, and OSHA regulates worker safety.

Source: CDC — Best Practices for Environmental Infection Prevention and Control — Frequently asked questions — Who regulates disinfectants?

Correct answer: C. Review and update it at least annually, documenting consideration of safer medical devices and input from frontline staff

OSHA requires the exposure control plan to be reviewed and updated at least annually and whenever tasks or positions change. Each review must reflect new technology and document consideration of safer devices, and the employer must ask non-managerial staff who provide direct patient care for input on choosing engineering and work practice controls.

Source: OSHA — 29 CFR 1910.1030, Bloodborne Pathogens — (c)(1)(iv)–(v)