Question 1

Which of the following techniques in dentistry has been proven to cause adverse health effects on patients?

Accepted Answer

A) Back suction 
B) Clogged suction line 
C) Backflow from saliva ejector 
D) None of the above 
A) Back suction 
B) Clogged suction line 
C) Backflow from saliva ejector 
D) None of the above D

Question 2

Research has shown that microbial counts in new dental unit waterlines can reach _____ CFUs/ml (colony-forming units per milliliter) within 5 days of installation.

Accepted Answer

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

Question 3

Factors contributing to the formation of bacteria in water lines include:

Accepted Answer

A) stagnant water. 
B) water heating. 
C) none of the above. 
D) both a and b. 
A) stagnant water. 
B) water heating. 
C) none of the above. 
D) both a and b. D

Question 4

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 5

Dental team members can reduce their exposure to the dental unit water by using:

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 6

To temporarily reduce the microbial count 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 7

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

Accepted Answer

A) not use a product that will damage the dental units. 
B) check with the manufacturer to determine the recommended chemical product and protocol for maintenance. 
C) not use more than once a month. 
D) both a and b. 
A) not use a product that will damage the dental units. 
B) check with the manufacturer to determine the recommended chemical product and protocol for maintenance. 
C) not use more than once a month. 
D) both a and b.

Question 8

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 9

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

Accepted Answer

A) 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) 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.

Question 10

_____ is a type of "plaque" that develops inside DUWLs and consists of bacterial cells and other microbes that adhere to surfaces and form a protective slime layer.

Accepted Answer

A) Infection 
B) Microfilm 
C) Biofilm 
D) Slime 
A) Infection 
B) Microfilm 
C) Biofilm 
D) Slime

Question 11

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

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) a and b only 
E) a and c onlyf. all of the above 
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) a and b only 
E) a and c onlyf. all of the above

Question 12

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) sterile water only in a sterile syringe. 
D) any type of water may be used. 
A) heated municipal water. 
B) distilled water from a self-contained system. 
C) sterile water only in a sterile syringe. 
D) any type of water may be used.

Question 13

The bacteria in the biofilm are up to _____ times more resistant to chemical germicides than planktonic bacteria.

Accepted Answer

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

Question 14

Disposable in-line 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 15

Biofilm can contain many types of bacteria,_______ 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 16

Methods of reducing the level of bacterial contamination in waterlines include:

Accepted Answer

A) yearly replacement of all water lines. 
B) back-flushing the lines with a bleach solution. 
C) self-contained water reservoirs. 
D) using waterlines of smaller diameter. 
A) yearly replacement of all water lines. 
B) back-flushing the lines with a bleach solution. 
C) self-contained water reservoirs. 
D) using waterlines of smaller diameter.

Question 17

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 18

While using water from municipal lines for routine dental procedures,biofilm and bacteria can be carried out reaching the patient through the use of:

Accepted Answer

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

Question 19

Flushing the dental waterlines for several minutes every morning and for 20-30 seconds between patients will help to:

Accepted Answer

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

Question 20

The advantages of self-contained water reservoirs include which of the following?

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 are advantages of self-contained reservoir systems. 
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 are advantages of self-contained reservoir systems.

Exam 24: Dental Unit Waterlines

Which of the following techniques in dentistry has been proven to cause adverse health effects on patients?

Research has shown that microbial counts in new dental unit waterlines can reach _____ CFUs/ml (colony-forming units per milliliter) within 5 days of installation.

Factors contributing to the formation of bacteria in water lines include:

Advantages of using self-contained water reservoirs include:

Dental team members can reduce their exposure to the dental unit water by using:

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

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

Planktonic bacteria are:

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

_____ is a type of "plaque" that develops inside DUWLs and consists of bacterial cells and other microbes that adhere to surfaces and form a protective slime layer.

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

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

The bacteria in the biofilm are up to _____ times more resistant to chemical germicides than planktonic bacteria.

Disposable in-line microfiltration cartridges should be replaced:

Biofilm can contain many types of bacteria,_______ protozoa.

Methods of reducing the level of bacterial contamination in waterlines include:

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

While using water from municipal lines for routine dental procedures,biofilm and bacteria can be carried out reaching the patient through the use of:

Flushing the dental waterlines for several minutes every morning and for 20-30 seconds between patients will help to:

The advantages of self-contained water reservoirs include which of the following?

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 found in the dental office.