Question 1

The uses of dental images include the detection of:

Accepted Answer

A) incipient occlusal lesions. 
B) periodontal probing depths. 
C) bone loss in its early stages. 
D) percussion sensitivity as part of endodontic evaluation. 
A) incipient occlusal lesions. 
B) periodontal probing depths. 
C) bone loss in its early stages. 
D) percussion sensitivity as part of endodontic evaluation. C

Question 2

Heat is reduced from the target by:

Accepted Answer

A) insulating oil. 
B) copper stem. 
C)  aluminum filter. 
D)  both a and b. 
E)  both b and c. 
A) insulating oil. 
B) copper stem. 
C)  aluminum filter. 
D)  both a and b. 
E)  both b and c. D

Question 3

The council that determines the radiation effects and levels tolerable for humans is the:

Accepted Answer

A) American Dental Association (Council on Radiation Safety). 
B) American Dental Association (Council on Dental Materials). 
C) National Council on Radiation Protection and Measurements. 
D) All of the above are correct. 
A) American Dental Association (Council on Radiation Safety). 
B) American Dental Association (Council on Dental Materials). 
C) National Council on Radiation Protection and Measurements. 
D) All of the above are correct. C

Question 4

A patient is concerned with radiation exposure.You can assure him that your office uses the ALARA concept,which includes:

Accepted Answer

A) reducing the number of exposures. 
B) minimizing retakes. 
C) keeping exposures levels as low as possible. 
D) all of the above. 
A) reducing the number of exposures. 
B) minimizing retakes. 
C) keeping exposures levels as low as possible. 
D) all of the above.

Question 5

Which of the following tissues has the highest radiation sensitivity?

Accepted Answer

A) Small lymphocytes 
B) Salivary gland 
C) Kidney 
D) Muscle tissue 
A) Small lymphocytes 
B) Salivary gland 
C) Kidney 
D) Muscle tissue

Question 6

The function of the filtration discs are used to _____ and are made of ______.

Accepted Answer

A) remove long wavelengths from the beam; aluminum 
B) remove long wavelengths from the beam; copper 
C) restrict the size of the beam; lead 
D) restrict the size of the beam; aluminum 
A) remove long wavelengths from the beam; aluminum 
B) remove long wavelengths from the beam; copper 
C) restrict the size of the beam; lead 
D) restrict the size of the beam; aluminum

Question 7

The component of the x-ray machine that functions in positioning the tubehead is the:

Accepted Answer

A) kilovoltage selector. 
B) control panel. 
C) extension arm. 
D) cathode. 
A) kilovoltage selector. 
B) control panel. 
C) extension arm. 
D) cathode.

Question 8

An exposure time of 1/2 second is equal to _____ impulse(s).

Accepted Answer

A) 1/2 
B) 12 
C) 30 
D) 2 
A) 1/2 
B) 12 
C) 30 
D) 2

Question 9

The dentist says that the image has too much contrast; he would like to see more gray values.What adjustment would you make?

Accepted Answer

A) Increase mA. 
B) Increase kVp. 
C) Decrease kVp. 
D) Decrease mA. 
A) Increase mA. 
B) Increase kVp. 
C) Decrease kVp. 
D) Decrease mA.

Question 10

The location where x-rays are produced in the x-ray tube is called the:

Accepted Answer

A) focal spot. 
B) filament. 
C) window. 
D) PID. 
A) focal spot. 
B) filament. 
C) window. 
D) PID.

Question 11

Damage caused by ionizing x-radiation to genetic cells:

Accepted Answer

A) affects only the person being exposed. 
B) can affect future generations. 
C) affects only the dental assistant. 
D) affects the cells of the eye, skin, and oral mucosa. 
A) affects only the person being exposed. 
B) can affect future generations. 
C) affects only the dental assistant. 
D) affects the cells of the eye, skin, and oral mucosa.

Question 12

A good technique for reducing the radiation exposure to both patient and operator is the use of:

Accepted Answer

A) a lead apron. 
B) thinner films. 
C) fast film or digital imaging. 
D) an automatic processor. 
A) a lead apron. 
B) thinner films. 
C) fast film or digital imaging. 
D) an automatic processor.

Question 13

How much filtration is federally required for a dental x-ray machine operating over 70 kVp?

Accepted Answer

A) 2.75 mm 
B) 2.50 mm 
C) 2.25 mm 
D) 0.5 mm 
A) 2.75 mm 
B) 2.50 mm 
C) 2.25 mm 
D) 0.5 mm

Question 14

Chronic radiation exposure occurs when _____ doses of radiation is received over a ____ time period.

Accepted Answer

A) large; short 
B) large; long 
C) small; short 
D) small; long 
A) large; short 
B) large; long 
C) small; short 
D) small; long

Question 15

Primary radiation is:

Accepted Answer

A) also called the useful beam. 
B) the beam of x-rays that comes from the target. 
C) less penetrating than secondary radiation. 
D) both a and b 
A) also called the useful beam. 
B) the beam of x-rays that comes from the target. 
C) less penetrating than secondary radiation. 
D) both a and b

Question 16

Dental imaging:

Accepted Answer

A) refers to film-based images. 
B) refers to digitally produced images. 
C) detects conditions that might otherwise remain undetected. 
D) is all of the above. 
A) refers to film-based images. 
B) refers to digitally produced images. 
C) detects conditions that might otherwise remain undetected. 
D) is all of the above.

Question 17

What happens when the exposure button is engaged?

Accepted Answer

A) The high-voltage circuit is activated. 
B) Kilovolts drive the electrons to the target. 
C) Electrons slam against the target producing the x-ray. 
D) All of the above are correct. 
A) The high-voltage circuit is activated. 
B) Kilovolts drive the electrons to the target. 
C) Electrons slam against the target producing the x-ray. 
D) All of the above are correct.

Question 18

The heart of the x-ray generating system is the:

Accepted Answer

A) x-ray tube. 
B) insulating oil. 
C) transformer. 
D) position indicator device. 
A) x-ray tube. 
B) insulating oil. 
C) transformer. 
D) position indicator device.

Question 19

The penetrating power of the x-ray beam is controlled by the settings on the:

Accepted Answer

A) impulse timer. 
B) kilovolt setting. 
C) milliamp setting. 
D) All of the above are correct. 
A) impulse timer. 
B) kilovolt setting. 
C) milliamp setting. 
D) All of the above are correct.

Question 20

The portion of the x-ray machine that supplies the electrons to produce x-rays is the:

Accepted Answer

A) cathode. 
B) anode. 
C) control panel. 
D) focusing cup. 
A) cathode. 
B) anode. 
C) control panel. 
D) focusing cup.

Exam 38: Foundations of Radiography, Radiographic Equipment, and Radiation Safety

The uses of dental images include the detection of:

Heat is reduced from the target by:

The council that determines the radiation effects and levels tolerable for humans is the:

A patient is concerned with radiation exposure.You can assure him that your office uses the ALARA concept,which includes:

Which of the following tissues has the highest radiation sensitivity?

The function of the filtration discs are used to _____ and are made of ______.

The component of the x-ray machine that functions in positioning the tubehead is the:

An exposure time of 1/2 second is equal to _____ impulse(s).

The dentist says that the image has too much contrast; he would like to see more gray values.What adjustment would you make?

The location where x-rays are produced in the x-ray tube is called the:

Damage caused by ionizing x-radiation to genetic cells:

A good technique for reducing the radiation exposure to both patient and operator is the use of:

How much filtration is federally required for a dental x-ray machine operating over 70 kVp?

Chronic radiation exposure occurs when _____ doses of radiation is received over a ____ time period.

Primary radiation is:

Dental imaging:

What happens when the exposure button is engaged?

The heart of the x-ray generating system is the:

The penetrating power of the x-ray beam is controlled by the settings on the:

The portion of the x-ray machine that supplies the electrons to produce x-rays is the:

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

Dental Unit Waterlines

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

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 function of the filtration discs are used to _ and are made of __.

Chronic radiation exposure occurs when _ doses of radiation is received over a time period.