Question 1

When the patient's jaws are outside the focal trough,the resulting images are:

Accepted Answer

A) doubled. 
B) ghost images. 
C) distorted. 
D) too light. 
A) doubled. 
B) ghost images. 
C) distorted. 
D) too light.

Question 2

The CBCT is useful in helping the dentist:

Accepted Answer

A) decide the correct placement of implants. 
B) with extractions of impacted teeth. 
C) determine the exact location of the mandibular nerve before surgery. 
D) do all of the above. 
A) decide the correct placement of implants. 
B) with extractions of impacted teeth. 
C) determine the exact location of the mandibular nerve before surgery. 
D) do all of the above.

Question 3

All of the following statements about cone beam computed tomography (CBCT)are true except the:

Accepted Answer

A) software program for the CBCT unit makes it possible to see soft tissue. 
B) images can be sent over the Internet for consultation on cases. 
C) CBCT is a little difficult to learn to use and requires a lot of practice. 
D) CBCT images may be colorized on the computer. 
A) software program for the CBCT unit makes it possible to see soft tissue. 
B) images can be sent over the Internet for consultation on cases. 
C) CBCT is a little difficult to learn to use and requires a lot of practice. 
D) CBCT images may be colorized on the computer.

Question 4

All of the following statements about panoramic imaging are true except:

Accepted Answer

A) panoramic images are primarily used for locating impacted teeth, lesions in the jaw, and eruption patterns. 
B) with film-based imaging, bitewings need to be taken to detect decay. 
C) digital panoramic unit can show small interproximal carious lesion, eliminating the need to take bitewing images. 
D) the digital panoramic unit uses film that has to be processed. 
A) panoramic images are primarily used for locating impacted teeth, lesions in the jaw, and eruption patterns. 
B) with film-based imaging, bitewings need to be taken to detect decay. 
C) digital panoramic unit can show small interproximal carious lesion, eliminating the need to take bitewing images. 
D) the digital panoramic unit uses film that has to be processed.

Question 5

Advantages of panoramic imaging include which of the following?

Accepted Answer

A) The entire maxilla and mandible are seen on one image. 
B) It is easy and quick to learn how to expose a panoramic image. 
C) Patients prefer panoramic images and are exposed to less radiation. 
D) All of the above are advantages. 
A) The entire maxilla and mandible are seen on one image. 
B) It is easy and quick to learn how to expose a panoramic image. 
C) Patients prefer panoramic images and are exposed to less radiation. 
D) All of the above are advantages.

Question 6

Anterior teeth that appear fat are caused by the:

Accepted Answer

A) patient's teeth positioned too far forward on bite block. 
B) patient's teeth positioned too far back on bite block. 
C) patient not sitting or standing up straight. 
D) chin positioned too low. 
A) patient's teeth positioned too far forward on bite block. 
B) patient's teeth positioned too far back on bite block. 
C) patient not sitting or standing up straight. 
D) chin positioned too low.

Question 7

The focal trough is an imaginary three-dimensional curved area or space that bears the same shape as a:

Accepted Answer

A) gutter. 
B) bowling pin. 
C) horseshoe. 
D) baseball diamond. 
A) gutter. 
B) bowling pin. 
C) horseshoe. 
D) baseball diamond.

Question 8

Each panoramic unit has a(n)______ that is used to align the patient's teeth as accurately as possible.

Accepted Answer

A) head position 
B) tubehead 
C) exposure control 
D) power source 
A) head position 
B) tubehead 
C) exposure control 
D) power source

Question 9

The part of the unit that aligns the patient's teeth as accurately as possible is the:

Accepted Answer

A) head positioner. 
B) focal trough. 
C) Frankfort plane. 
D) tubehead. 
A) head positioner. 
B) focal trough. 
C) Frankfort plane. 
D) tubehead.

Question 10

Computed tomography:

Accepted Answer

A) is used in dentistry primarily for diagnosing of lesions and planning implant cases. 
B) uses a magnetic field, thereby not exposing the patient to x-radiation. 
C) has long been used in dental radiology and the scanners are common in dental offices. 
D) requires the use of film and processing. 
A) is used in dentistry primarily for diagnosing of lesions and planning implant cases. 
B) uses a magnetic field, thereby not exposing the patient to x-radiation. 
C) has long been used in dental radiology and the scanners are common in dental offices. 
D) requires the use of film and processing.

Question 11

The quality of the panoramic view depends on:

Accepted Answer

A) how the patient's jaw is positioned within the focal trough. 
B) the size of the patient's jaw. 
C) how closely the patient's jaw conforms to the focal trough. 
D) all of the above. 
A) how the patient's jaw is positioned within the focal trough. 
B) the size of the patient's jaw. 
C) how closely the patient's jaw conforms to the focal trough. 
D) all of the above.

Question 12

To avoid a lead apron artifact on a panoramic radiograph:

Accepted Answer

A) use a lead apron without a thyroid collar. 
B) place the lead apron high around the neck of the patient so that it does not block the x-ray beam. 
C) place the lead apron low around the neck of the patient so that it does not block the x-ray beam. 
D) do both a and c 
A) use a lead apron without a thyroid collar. 
B) place the lead apron high around the neck of the patient so that it does not block the x-ray beam. 
C) place the lead apron low around the neck of the patient so that it does not block the x-ray beam. 
D) do both a and c

Question 13

The ______ used in the panoramic x-ray machine tubehead is a lead plate with an opening shaped like a narrow vertical slit.

Accepted Answer

A) filter 
B) collimator 
C) patient chair 
D) bite block 
A) filter 
B) collimator 
C) patient chair 
D) bite block

Question 14

Which statement is true of a grid?

Accepted Answer

A) The grid is placed between the patient's head and the film. 
B) A grid allows passage of the x-ray beam. 
C) Scatter radiation is absorbed by the lead strips on the grid, reducing film fog. 
D) All of the above are true statements. 
A) The grid is placed between the patient's head and the film. 
B) A grid allows passage of the x-ray beam. 
C) Scatter radiation is absorbed by the lead strips on the grid, reducing film fog. 
D) All of the above are true statements.

Question 15

The correct position of the Frankfort plane for a diagnostically correct panoramic image is:

Accepted Answer

A) parallel to the floor. 
B) perpendicular to the floor. 
C) tipped downward. 
D) tipped upward. 
A) parallel to the floor. 
B) perpendicular to the floor. 
C) tipped downward. 
D) tipped upward.

Question 16

Skull radiography is most often used in:

Accepted Answer

A) endodontics and oral surgery. 
B) oral surgery and orthodontics. 
C) orthodontics and fixed prosthodontics. 
D) prosthodontics and pediatric dentistry. 
A) endodontics and oral surgery. 
B) oral surgery and orthodontics. 
C) orthodontics and fixed prosthodontics. 
D) prosthodontics and pediatric dentistry.

Exam 42: Extraoral Imaging

When the patient's jaws are outside the focal trough,the resulting images are:

The CBCT is useful in helping the dentist:

All of the following statements about cone beam computed tomography (CBCT)are true except the:

All of the following statements about panoramic imaging are true except:

Advantages of panoramic imaging include which of the following?

Anterior teeth that appear fat are caused by the:

The focal trough is an imaginary three-dimensional curved area or space that bears the same shape as a:

Each panoramic unit has a(n)______ that is used to align the patient's teeth as accurately as possible.

The part of the unit that aligns the patient's teeth as accurately as possible is the:

Computed tomography:

The quality of the panoramic view depends on:

To avoid a lead apron artifact on a panoramic radiograph:

The ______ used in the panoramic x-ray machine tubehead is a lead plate with an opening shaped like a narrow vertical slit.

Which statement is true of a grid?

The correct position of the Frankfort plane for a diagnostically correct panoramic image is:

Skull radiography is most often used in:

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

Foundations of Radiography, Radiographic Equipment, and Radiation Safety

Digital Imaging, Dental Film, and Processing Radiographs

Legal Issues, Quality Assurance, and Infection Prevention

Intraoral 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

Communication in the Dental Office

Business Operating Systems

Financial Management in the Dental Office

Marketing Your Skills