Question 1

If the patient's chin is positioned too low during the panoramic exposure:

Accepted Answer

A) the mandibular incisors will appear blurred. 
B) the condyles will not be visible. 
C) detail in the posterior apical regions will be lost. 
D) both a and b. 
A) the mandibular incisors will appear blurred. 
B) the condyles will not be visible. 
C) detail in the posterior apical regions will be lost. 
D) both a and b. D

Question 2

A panoramic image allows the dentist to:

Accepted Answer

A) detect caries. 
B) view the entire dentition and related structures in one film. 
C) view all of the sinus cavities. 
D) both a and b. 
A) detect caries. 
B) view the entire dentition and related structures in one film. 
C) view all of the sinus cavities. 
D) both a and b. D

Question 3

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 of panoramic imaging. 
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 of panoramic imaging. D

Question 4

If the patient does not stand or sit with a straight spine:

Accepted Answer

A) the panoramic image will be blurred. 
B) an "exaggerated smile line"" or curved downward smile line will appear. 
C) detail of the apical regions of the teeth will be lost. 
D) the cervical spine will appear as a radiopacity in the center of the film, obscuring the diagnostic information. 
A) the panoramic image will be blurred. 
B) an "exaggerated smile line"" or curved downward smile line will appear. 
C) detail of the apical regions of the teeth will be lost. 
D) the cervical spine will appear as a radiopacity in the center of the film, obscuring the diagnostic information.

Question 5

A ghost image will appear _____ than normal and on the _____ side of the image.

Accepted Answer

A) larger; opposite 
B) larger; same 
C) smaller; opposite 
D) smaller; same 
A) larger; opposite 
B) larger; same 
C) smaller; opposite 
D) smaller; same

Question 6

Which statement is not true concerning panoramic imaging?

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 7

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 8

If a dark radiolucent shadow obscures the apices of the maxillary teeth,the:

Accepted Answer

A) patient's lips were not closed on the bite-block during the exposure. 
B) patient's tongue was not in contact with the palate during the exposure. 
C) patient's head was posterior to the focal trough. 
D) patient needed to swallow. 
A) patient's lips were not closed on the bite-block during the exposure. 
B) patient's tongue was not in contact with the palate during the exposure. 
C) patient's head was posterior to the focal trough. 
D) patient needed to swallow.

Question 9

The main components of the panoramic unit include ________,and exposure controls.

Accepted Answer

A) x-ray tubehead 
B) x-ray tubehead, position-indicator device 
C) x-ray tubehead, head positioner 
D) position-indicator device, head positioner 
A) x-ray tubehead 
B) x-ray tubehead, position-indicator device 
C) x-ray tubehead, head positioner 
D) position-indicator device, head positioner

Question 10

A dark radiolucent shadow that obscures the anterior teeth can indicate that the patient's:

Accepted Answer

A) chin was too low. 
B) head was posterior to the focal trough. 
C) lips were not closed on the bite-block during the exposure. 
D) tongue was not in contact with the palate during the exposure. 
A) chin was too low. 
B) head was posterior to the focal trough. 
C) lips were not closed on the bite-block during the exposure. 
D) tongue was not in contact with the palate during the exposure.

Question 11

The lead plate in the panoramic tubehead with an opening shaped like a narrow vertical slit is the:

Accepted Answer

A) exposure control. 
B) cephalostat. 
C) focal trough. 
D) collimator. 
A) exposure control. 
B) cephalostat. 
C) focal trough. 
D) collimator.

Question 12

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

Accepted Answer

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

Question 13

The exposure controls allow the _____ to be adjusted on the panoramic x-ray unit,to accommodate patients of different sizes.

Accepted Answer

A) exposure time 
B) vertical angulation 
C) horizontal angulation 
D) milliamperage and kilovoltage 
A) exposure time 
B) vertical angulation 
C) horizontal angulation 
D) milliamperage and kilovoltage

Question 14

A grid:

Accepted Answer

A) reduces the amount of scatter radiation that reaches the patient. 
B) decreases the contrast of the radiographic image. 
C) decreases the film fog, increasing the contrast of the image. 
D) both a and c. 
A) reduces the amount of scatter radiation that reaches the patient. 
B) decreases the contrast of the radiographic image. 
C) decreases the film fog, increasing the contrast of the image. 
D) both a and c.

Question 15

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. 
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.

Question 16

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) 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) all of the above.

Question 17

A patient wearing earrings or glasses must remove them before a panoramic x-ray image exposure; otherwise,a _____ will appear on the image.

Accepted Answer

A) dark area 
B) blurred area 
C) ghost image 
D) both b and c 
A) dark area 
B) blurred area 
C) ghost image 
D) both b and c

Question 18

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 19

The focal trough is an imaginary three-dimensional curved area or space,shaped like a:

Accepted Answer

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

Question 20

If the patient's teeth are not positioned in the groove of the bite-block,the teeth will appear:

Accepted Answer

A) "fat." 
B) "skinny." 
C) "tall." 
D) "short." 
A) "fat." 
B) "skinny." 
C) "tall." 
D) "short."

Exam 42: Extraoral Imaging

If the patient's chin is positioned too low during the panoramic exposure:

A panoramic image allows the dentist to:

Advantages of panoramic imaging include which of the following?

If the patient does not stand or sit with a straight spine:

A ghost image will appear _____ than normal and on the _____ side of the image.

Which statement is not true concerning panoramic imaging?

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

If a dark radiolucent shadow obscures the apices of the maxillary teeth,the:

The main components of the panoramic unit include ________,and exposure controls.

A dark radiolucent shadow that obscures the anterior teeth can indicate that the patient's:

The lead plate in the panoramic tubehead with an opening shaped like a narrow vertical slit is the:

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

The exposure controls allow the _____ to be adjusted on the panoramic x-ray unit,to accommodate patients of different sizes.

A grid:

Which statement is true of a grid?

The CBCT is useful in helping the dentist:

A patient wearing earrings or glasses must remove them before a panoramic x-ray image exposure; otherwise,a _____ will appear on the image.

The quality of the panoramic view depends on:

The focal trough is an imaginary three-dimensional curved area or space,shaped like a:

If the patient's teeth are not positioned in the groove of the bite-block,the teeth will appear:

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

A ghost image will appear _ than normal and on the _ side of the image.