Question 1

The dental office gets its water from _____,and the water then is routed to _____.

Accepted Answer

A)  municipal supplies; sinks, toilets, air conditioners, and the dental unit
B)  tanks delivered to the office; sinks, toilets, air conditioners, and the dental unit
C)  wells; sinks, toilets, air conditioners, and the dental unit
D)  Both a and b are correct.
E)  Both a and c are correct.F) B) and D)
G) C) and D)

Question 2

Which of the following statements is true about dental unit waterlines?

Accepted Answer

A)  Viruses cannot multiply in the DUWL.
B)  The use of sterile water in the self-contained water reservoir ensures that water will be sterile at the point of delivery.
C)  Microfilters reduce the bacterial contamination of water and destroy the biofilms that colonize the DUWLs.
D)  Flushing for 20 to 30 seconds after each patient will remove biofilms from the lines.E) A) and D)
F) All of the above

Question 3

The type of plaque that develops inside DUWLs,consisting of bacterial cells and other microbes,is called:

Accepted Answer

A)  the infective layer.
B)  microfilm.
C)  biofilm plaque.
D)  slime.E) B) and C)
F) A) and C)

Question 4

To reduce the microbial count temporarily and to help clean the handpiece waterlines,DUWLs should be flushed:

Accepted Answer

A)  for 20 to 30 seconds between patients.
B)  every morning for several minutes.
C)  every evening for 20 minutes.
D)  both a and bE) B) and D)
F) A) and C)

Question 5

Methods of reducing the level of bacterial contamination in waterlines include all of the following except:

Accepted Answer

A)  yearly replacement of all water lines.
B)  chemical treatment regimens.
C)  self-contained water reservoirs.
D)  microfiltration.E) B) and C)
F) B) and D)

Question 6

Advantages of using self-contained water reservoirs include:

Accepted Answer

A)  increasing the number of bacteria in waterlines.
B)  decreasing the number of bacteria in waterlines.
C)  giving the dental office control over quality of water used.
D)  all of the above.E) A) and D)
F) None of the above

Question 7

The advantages of self-contained water reservoirs include:

Accepted Answer

A)  they are less expensive to use.
B)  dental personnel can select the quality of water used.
C)  maintenance of the water system is under the control of the dental staff.
D)  both b and cE) All of the above
F) B) and C)

Question 8

While using for routine dental procedures,biofilm and bacteria found in water from municipal lines can enter the oral cavity of a patient through:

Accepted Answer

A)  the faucet.
B)  the handpiece.
C)  the waterline.
D)  both b and cE) B) and D)
F) None of the above

Question 9

Reduction of exposure to the dental unit water for the dental team includes all of the following except:

Accepted Answer

A)  the HVE.
B)  a dental dam.
C)  masks, protective eyewear, and/or face shields.
D)  both a and cE) B) and D)
F) A) and C)

Question 10

Within 5 days of installation,research has shown that microbial counts in new dental unit waterlines can reach _____ CFUs/mL.

Accepted Answer

A)  10
B)  500
C)  1000
D)  200,000E) A) and C)
F) A) and B)

Question 11

Backflow from low-volume saliva ejectors can occur when a patient:

Accepted Answer

A)  is positioned in a reclined position in the dental chair.
B)  closes his or her lips around the tip of a saliva ejector.
C)  first turns on the saliva ejector.
D)  has been using a saliva ejector for more than 10 minutes.E) A) and C)
F) None of the above

Question 12

The options available for testing the quality of waterline cleaning include:

Accepted Answer

A)  none; there is no availability for testing of the dental waterline cleaning.
B)  using a commercial testing service.
C)  using an in-office test kit.
D)  both b and cE) All of the above
F) C) and D)

Question 13

Disposable inline microfiltration cartridges should be replaced:

Accepted Answer

A)  according to the manufacturer's recommendations.
B)  between patients.
C)  once a week.
D)  twice a day.E) B) and C)
F) A) and D)

Question 14

Flushing the dental waterlines for several minutes at the beginning of the treatment day and for 20 to 30 seconds between patients will help to:

Accepted Answer

A)  reduce prep time.
B)  reduce the microbial count.
C)  do both a and b
D)  do none of the above.E) A) and D)
F) B) and C) B

Question 15

Biofilm can contain many types of bacteria,including _____ protozoa.

Accepted Answer

A)  fungi, algae, and
B)  fungi, and algae, but not
C)  and fungi, but neither algae nor
D)  but not fungi, algae, orE) B) and D)
F) A) and C)

Question 16

When choosing a chemical agent to give dental unit water lines a "shock" treatment,care should be taken to:

Accepted Answer

A)  use a product that will not damage the dental units.
B)  check with the manufacturer to determine the recommended chemical product and protocol for maintenance.
C)  use a chemical agent no more than once a month.
D)  do both a and bE) A) and B)
F) A) and D) D

Question 17

The type of water used during surgery where bone is exposed should be:

Accepted Answer

A)  heated municipal water.
B)  distilled water from a self-contained system.
C)  only sterile water delivered in a sterile syringe.
D)  any type of water can be used.E) C) and D)
F) None of the above C

Question 18

The bacteria in the biofilm are more resistant to chemical germicides than planktonic bacteria by a factor of:

Accepted Answer

A)  3.
B)  5.
C)  100.
D)  1500.E) A) and B)
F) B) and C)

Question 19

Planktonic bacteria are:

Accepted Answer

A)  unable to survive in DUWLs.
B)  prevented from entering DUWLs by use of anti-retraction valves.
C)  free floating in the water.
D)  in the biofilm attached to DUWL walls.E) A) and C)
F) None of the above

Question 20

Factors contributing to the formation of bacteria in DUWLs include all of the following except:

Accepted Answer

A)  stagnant water.
B)  water heating.
C)  well water.
D)  back flow from a saliva ejector.E) B) and D)
F) B) and C)

Exam 24: Dental Unit Waterlines

The dental office gets its water from _____,and the water then is routed to _____.

Correct AnswerverifiedShow Answer

Which of the following statements is true about dental unit waterlines?

Correct AnswerverifiedShow Answer

The type of plaque that develops inside DUWLs,consisting of bacterial cells and other microbes,is called:

Correct AnswerverifiedShow Answer

To reduce the microbial count temporarily and to help clean the handpiece waterlines,DUWLs should be flushed:

Correct AnswerverifiedShow Answer

Methods of reducing the level of bacterial contamination in waterlines include all of the following except:

Correct AnswerverifiedShow Answer

Advantages of using self-contained water reservoirs include:

Correct AnswerverifiedShow Answer

The advantages of self-contained water reservoirs include:

Correct AnswerverifiedShow Answer

While using for routine dental procedures,biofilm and bacteria found in water from municipal lines can enter the oral cavity of a patient through:

Correct AnswerverifiedShow Answer

Reduction of exposure to the dental unit water for the dental team includes all of the following except:

Correct AnswerverifiedShow Answer

Within 5 days of installation,research has shown that microbial counts in new dental unit waterlines can reach _____ CFUs/mL.

Correct AnswerverifiedShow Answer

Backflow from low-volume saliva ejectors can occur when a patient:

Correct AnswerverifiedShow Answer

The options available for testing the quality of waterline cleaning include:

Correct AnswerverifiedShow Answer

Disposable inline microfiltration cartridges should be replaced:

Correct AnswerverifiedShow Answer

Flushing the dental waterlines for several minutes at the beginning of the treatment day and for 20 to 30 seconds between patients will help to:

Correct AnswerverifiedB

Biofilm can contain many types of bacteria,including _____ protozoa.

Correct AnswerverifiedShow Answer

When choosing a chemical agent to give dental unit water lines a "shock" treatment,care should be taken to:

Correct AnswerverifiedD

The type of water used during surgery where bone is exposed should be:

Correct AnswerverifiedC

The bacteria in the biofilm are more resistant to chemical germicides than planktonic bacteria by a factor of:

Correct AnswerverifiedShow Answer

Planktonic bacteria are:

Correct AnswerverifiedShow Answer

Factors contributing to the formation of bacteria in DUWLs include all of the following except:

Correct AnswerverifiedShow Answer

The dental office gets its water from _,and the water then is routed to _.

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B

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C

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