Chapter 24 Q&A

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Medix School of Health Care *

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100

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Medicine

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Oct 30, 2023

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2 4 Recall Questions and Answers for Dental Unit Waterlines IODA 101 1. Are waterborne diseases limited to dentistry?  NO 2. Is the presence of bacteria in DUWLs a recent finding?  30 years was the first reporting. 3. Has a widespread public health problem regarding contaminated dental water been reported?  NO 4. What bacteria cause the disease legionellosis?  Legionella 5. Where is biofilm found?  Where moisture and a suitable surface is available 6. Is it appropriate to heat the water in dental units?  It can increase levels of bacteria colonization. 7. Is it possible to eliminate biofilm completely?  NO, it can be reduced 8. If sterile water is used in the self-contained reservoir, will the water that enters the patient’s mouth be sterile?  No, because the parts inside the dental unit can’t be sterilized. 9. How often should microfilters be changed?  According to manufactures 10. What precautions should you take when selecting a chemical for the dental unit?  According to manufactures. 11. What type of water must be used as an irrigant for surgery involving bone?  Sterile water 12. Will flushing DUWLs remove biofilm?  NO 13. When should the high-volume evacuator be used to minimize aerosol?  Assisting any high speed hand pieces, ultrasonic scaler, air-waste syringe. 14. Will the use of a rubber dam totally eliminate exposure to microorganisms?  It will only reduce the microorganisms. 15. What methods are available to test the quality of dental unit water?  Commercial testing service-in-office testing.

FILL-IN-THE-BLANK STATEMENTS Select the best term from the list below and complete the following statements. antiretraction device biofilm colony-forming units dental unit waterlines Legionella microfiltration planktonic bacteria self-contained water reservoir 1. Biofilm is a slime-producing bacterial community that can harbor fungi, algae, and protozoa. 2. The bacterium responsible for the disease legionellosis is legionella. 3. Microfiltration is the use of membrane filters to trap microorganisms suspended in water. 4. Colony-forming units are the minimum number of separable cells on the surface of a semisolid agar medium that create a visible colony. 5. Dental unit waterlines are made of small-bore plastic tubing and are used to deliver dental treatment water through a dental unit. 6. A(n) self-contained water reservoir is a container that is used to hold and supply water or other solutions to handpieces and air-water syringes attached to a dental unit. 7. Antiretraction device is a mechanism that prevents entry of fluids and microorganisms into waterlines as a result of negative water pressure, also referred to as “suck back.” 8. Bacteria that are floating in water are planktonic bacteria.

MULTIPLE-CHOICE QUESTIONS Complete each question by circling the best answer. 1. Are waterborne diseases limited to dentistry? a. Yes b. No 2. When was the presence of bacteria first reported in dental unit waterlines? a. 5 years ago b. 10 years ago c. 20 years ago d. 30 years ago 3. What bacteria cause the disease legionellosis? a. Streptococci b. Legionella bacteria c. Bacilli d. Staphylococci 4. Where is biofilm found? a. Suction tips b. Handpiece waterlines c. Air-water syringe waterlines d. b and c 5. Should water be heated in the dental units to kill the bacteria? a. Yes b. No c. It doesn’t matter. 6. Can biofilm in dental unit waterlines be completely eliminated? a. Yes b. No 7. If sterile water is used in a self-contained reservoir, will the water that enters the patient’s mouth be sterile? a. Yes b. No 8. The recommendation for changing microfilters in waterlines is ___________? a. Daily b. Weekly c. Bimonthly d. According to manufacturer’s directions 9. According to CDC guidelines, who should you con-tact when selecting a chemical for the dental unit? a. ADA b. Equipment manufacturer c. OSHA d. CDC 10. According to CDC guidelines, what type of water must be used as an irrigant for surgery involving bone? a. Saline water b. Tap water c. Sterile water d. Carbonated water 11. Will flushing dental unit waterlines remove biofilm? a. Yes b. No 12. When should the high-volume evacuator be used to minimize aerosol? a. With the high-speed handpiece b. With the ultrasonic scaler c. With the air-water syringe d. All of the above 13. Will the use of a dental dam totally eliminate the dental assistant’s exposure to microorganisms? a. Yes b. No 14. What type of personal protective equipment (PPE) is especially critical when aerosol is being generated? a. Eyewear b. Mask c. Gloves d. a and b

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