Question 1

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. 
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. C

Question 2

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 b 
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 b D

Question 3

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

Question 4

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 c 
A) the faucet. 
B) the handpiece. 
C) the waterline. 
D) both b and c

Question 5

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. 
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.

Question 6

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

Question 7

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. 
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.

Question 8

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

Question 9

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. 
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.

Question 10

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. 
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.

Question 11

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

Question 12

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

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

Question 14

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 c 
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 c

Question 15

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) 200,000 
A) 10 
B) 500 
C) 1000 
D) 200,000

Question 16

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. 
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.

Question 17

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. 
A) 3. 
B) 5. 
C) 100. 
D) 1500.

Question 18

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

Question 19

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

Question 20

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 c 
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 c

Exam 24: Dental Unit Waterlines

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

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

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:

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

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

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

Advantages of using self-contained water reservoirs include:

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

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

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

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

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

Disposable inline microfiltration cartridges should be replaced:

The advantages of self-contained water reservoirs include:

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

Planktonic bacteria are:

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

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

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

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

History of Dentistry

The Professional Dental Assistant

The Dental Healthcare Team

Dental Ethics

Dentistry and the Law

General Anatomy

General Physiology

Oral Embryology and Histology

Head and Neck Anatomy

Landmarks of the Face and Oral Cavity

Overview of the Dentitions

Tooth Morphology

Dental Caries

Periodontal Disease

Preventive Dentistry

Nutrition

Oral Pathology

Microbiology

Disease Transmission and Infection Prevention

Principles and Techniques of Disinfection

Principles and Techniques of Instrument Processing and Sterilization

Regulatory and Advisory Agencies

Chemical and Waste Management

Ergonomics

The Patient Record

Vital Signs

Oral Diagnosis and Treatment Planning

The Special Needs and Medically Compromised Patient

Principles of Pharmacology

Assisting in a Medical Emergency

The Dental Office

Delivering Dental Care

Dental Hand Instruments

Dental Handpieces and Accessories

Moisture Control

Anesthesia and Pain Control

Foundations of Radiography, Radiographic Equipment, and Radiation Safety

Digital Imaging, Dental Film, and Processing Radiographs

Legal Issues, Quality Assurance, and Infection Prevention

Intraoral Imaging

Extraoral Imaging

Restorative and Esthetic Dental Materials

Dental Liners, Bases, and Bonding Systems

Dental Cements

Impression Materials

Laboratory Materials and Procedures

General Dentistry

Matrix Systems for Restorative Dentistry

Fixed Prosthodontics

Provisional Coverage

Removable Prosthodontics

Dental Implants

Endodontics

Periodontics

Oral and Maxillofacial Surgery

Pediatric Dentistry

Coronal Polishing

Dental Sealants

Orthodontics

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