FREE AND STUDY GAMES ABOUT CHAPTER 24: UNIT W

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FREE AND STUDY GAMES ABOUT CHAPTER 24: UNIT W

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -31 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: self-contained water reservoir

Answer:

container attached to a dental unit that is used to hold and supply water or other solutions to hand pieces and air-water syringes Question 2: What methods are available to test the quality of dental unit water?

Answer:

a commercial testing service, to which you send samples of the unit water and results are mailed or faxed back to the dental office. the second method is to use an in-office test kit usually done with three samples of water taken from the same dental unit

Question 3: Will flushing DUWLs remove biofilm?

Answer:

temporarily reduces the microbial count in the water and helps clean the hand piece waterlines of materials that may have entered from the patient's mouth

Question 4: What type of water must be used for irrigation for surgery involving bone?

Answer:

Only sterile water from a sterile water delivery system or hand irrigation with sterile water in a sterile disposable syringe should be used in these types of surgeries.

Question 5: microfiltration

Answer:

process by which contaminated fluid is passed through a pore-sized membrane to separate microorganisms

Question 6: Why there is a renewed interest in DUWL contamination

Answer:

increased awareness of occupational hazards in the dental office, as well as concern about the increasing number of dental patients who have been diagnosed with a weakened immune system

Question 7: Legionella (lee-juh-NEL-uh)

Answer:

bacteria that can cause a certain type of pneumonia called Legionnaires' pneumonia Question 8: Is the presence of bacteria in dental unit waterlines a recent finding?

Answer:

The presence of bacteria in DUWLs was first reported more than 30 years ago.Question 9: Will the use of a rubber dam totally eliminate exposure to microorganisms?

Answer:

reduces the aerosolizing and spattering of patient microorganisms onto the dental team, but it does not reduce exposure of the dental team to dental unit water.

Question 10: When should the high-volume evacuator be used to minimize aerosol?

Answer:

when assisting with use of the high-speed hand piece, ultrasonic scaler, and air-water syringe. This will reduce contamination from the aerosol and spatter from the patient's saliva and from contact with the water spray

Question 11: What bacteria is associated with legionellosis?

Answer:

Legionella species are harmful bacteria often found in water and moist places that are responsible for the disease

Question 12: heterotrophic (het-ur-oe-TROF-ik) bacteria

Answer:

bacteria that use organic carbon as food; protozoa fungi, and most bacteria fall into this category Question 13: Has a widespread public health problem regarding contaminated dental water been reported?

Answer:

no evidence suggests a widespread public health problem, published reports have associated illness with exposure to water from dental units

Question 14: Factors involved in bacterial contamination of dental unit water

Answer:

Intermittent stagnation of water inside the units typically occurs between patients, overnight, and over weekends, allowing the planktonic community of bacteria to attach to the walls of the tube and heated water.

Question 15: Describe methods used to reduce bacterial contamination in DUWLs

Answer:

Flush waterlines for several minutes, Use a self-contained water reservoir system, application of chemical germicides, Use a separate (sterile water) system for surgical procedures, Use microfiltration cartridges in the waterlines.

Question 16: immunocompromised

Answer:

having a weakened immune system

Question 17: The role of biofilm in DUWL contamination

Answer:

Biofilm is a type of "plaque" that develops inside DUWLs and causes "infection" of the water delivery system.

Question 18: How often should microfilters be changed?

Answer:

Depending on the amount of use, the cartridges must be changed according to the manufacturer's recommendations

Question 19: Where is biofilm found?

Answer:

Biofilm is found in virtually all places where moisture and a suitable surface exist.

Question 20: Are waterborne diseases limited to dentistry?

Answer:

Outbreaks of waterborne disease have occurred in a broad range of facilities, including hospitals, nursing homes, schools, restaurants, community water supplies, swimming pools, and spas.

Question 21: biofilm (BYE-oe-film)

Answer:

slime-producing bacterial communities that can harbor fungi, algae, and protozoa

Question 22: Is it possible to eliminate biofilm completely?

Answer:

When bacteria are embedded in the protective biofilm (slime layer), they are extremely difficult to remove or kill. Bacteria in the biofilm are up to 1500 times more resistant to chemical germicides than are planktonic (free-floating) bacteria.

Question 23: colony-forming units (CFUs)

Answer:

number of separable cells on the surface of a semisolid agar medium that create a visible colony

Question 24: antiretraction device

Answer:

mechanism that prevents entry of fluids and microorganisms into waterlines as a result of negative water pressure; also called "suck back"