Question 1

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

Accepted Answer

A) the maxillary premolars will be blurred. 
B) the floor of the nasal cavity will be superimposed over the roots of the mandibular teeth. 
C) a "reverse smile line" will appear on the radiograph. 
D) detail of the mandibular region will be lost. 
A) the maxillary premolars will be blurred. 
B) the floor of the nasal cavity will be superimposed over the roots of the mandibular teeth. 
C) a "reverse smile line" will appear on the radiograph. 
D) detail of the mandibular region will be lost.

Question 2

What new feature of the panoramic unit has allowed better resolution to show better details?

Accepted Answer

A) Cephalostat 
B) Focal trough 
C) Digital technology 
D) Magnetic resonance 
A) Cephalostat 
B) Focal trough 
C) Digital technology 
D) Magnetic resonance

Question 3

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 4

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 5

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 6

Which statement is not true of the panoramic tubehead?

Accepted Answer

A) The tubehead rotates the film behind the patient's head. 
B) The tubehead rotates behind the patient's head. 
C) The vertical angulation of the tubehead is not adjustable. 
D) The tubehead houses the filament that produces electrons and target that produces radiographs. 
A) The tubehead rotates the film behind the patient's head. 
B) The tubehead rotates behind the patient's head. 
C) The vertical angulation of the tubehead is not adjustable. 
D) The tubehead houses the filament that produces electrons and target that produces radiographs.

Question 7

The cause of a panoramic image that comes out with a radiopaque cone-shaped artifact that interferes with the diagnostic information is the:

Accepted Answer

A) patient's chin was too high during the procedure. 
B) patient's lead apron was incorrectly placed or a lead apron with a thyroid collar was used. 
C) patient's head was posterior to the focal trough. 
D) patient moved during the procedure. 
A) patient's chin was too high during the procedure. 
B) patient's lead apron was incorrectly placed or a lead apron with a thyroid collar was used. 
C) patient's head was posterior to the focal trough. 
D) patient moved during the procedure.

Question 8

Which statement is not true regarding magnetic resonance imaging (MRI)?

Accepted Answer

A) The MRI technique is valuable in the diagnosis of temporomandibular disorders. 
B) The MRI technique exposes the patient to a large amount of radiation and should only be used when no other source is available. 
C) The MRI has the ability to distinguish among soft tissues, such as salivary glands. 
D) MRI units are large and usually not found in dental offices. 
A) The MRI technique is valuable in the diagnosis of temporomandibular disorders. 
B) The MRI technique exposes the patient to a large amount of radiation and should only be used when no other source is available. 
C) The MRI has the ability to distinguish among soft tissues, such as salivary glands. 
D) MRI units are large and usually not found in dental offices.

Question 9

In panoramic imaging,________ around the patient.

Accepted Answer

A) the film/sensor rotates 
B) the tubehead rotates 
C) both the film/sensor and the tubehead rotate 
D) neither the film/sensor nor the tubehead rotates 
A) the film/sensor rotates 
B) the tubehead rotates 
C) both the film/sensor and the tubehead rotate 
D) neither the film/sensor nor the tubehead rotates

Question 10

The skull view that shows the bones of the face and skull and the soft tissue profile is the ______ projection.

Accepted Answer

A) lateral cephalometric 
B) posteroanterior 
C) magnetic resonance 
D) temporomandibular 
A) lateral cephalometric 
B) posteroanterior 
C) magnetic resonance 
D) temporomandibular

Question 11

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.

Question 12

Which is not true of the cone beam computed tomography (CBCT)?

Accepted Answer

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

Question 13

How can a lead apron artifact be avoided during exposure of panoramic images?

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) Both a and c are correct. 
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) Both a and c are correct.

Question 14

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 15

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 16

Advantages of panoramic imaging,when contrasted with intraoral imaging,include:

Accepted Answer

A) less radiation exposure. 
B) no focal trough limitations. 
C) lower equipment cost. 
D) both a and c. 
A) less radiation exposure. 
B) no focal trough limitations. 
C) lower equipment cost. 
D) both a and c.

Exam 42: Extraoral Imaging

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

What new feature of the panoramic unit has allowed better resolution to show better details?

Anterior teeth that appear fat are caused by the:

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

Computed tomography:

Which statement is not true of the panoramic tubehead?

The cause of a panoramic image that comes out with a radiopaque cone-shaped artifact that interferes with the diagnostic information is the:

Which statement is not true regarding magnetic resonance imaging (MRI)?

In panoramic imaging,________ around the patient.

The skull view that shows the bones of the face and skull and the soft tissue profile is the ______ projection.

Skull radiography is most often used in:

Which is not true of the cone beam computed tomography (CBCT)?

How can a lead apron artifact be avoided during exposure of panoramic images?

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

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

Advantages of panoramic imaging,when contrasted with intraoral imaging,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

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