Oral Radiology quiz 2 Questions and Answers Elaborations
(100% Correct Answers)
True or false:
Occlusal radiographs utilize the bisecting-angle technique.
➢ True.
Dr. Yang said this verbally on first slide of lecture
Which is false regarding paralleling technique?
a. It is the preferred technique
b. Film or sensor is not close to teeth, but parallel to the long axis of teeth
c. Central rays are parallel to the long axis of teeth and film/sensor
d. Minimal distortion with anatomic accuracy
e. All of the above are true
➢ c. Central rays are parallel to the long axis of teeth and film/sensor
PERPENDICULAR
Which is false regarding the paralleling technique?
a. Film/sensor must be parallel to the tooth long axis
b. Central rays must be perpendicular to film/sensor
c. Central rays must be perpendicular to teeth
d. There is an increased focal spot-film/sensor distance
e. Film/sensor holder & beam alignment device are not required
➢ e. Film/sensor holder & beam alignment device are not required
XCP is required
,Film/sensor is close to teeth, but not parallel to the long axis of teeth. Central ray
perpendicular to an imaginary plane that bisects the angle b/w teeth & film/sensor.
a. Paralleling technique
b. Bisecting-angle technique
➢ b. Bisecting-angle technique
Which of the following is incorrect regarding the bisecting angle technique?
a. There is dimensional distortion with inherent anatomic inaccuracy.
b. Distortion tends to decrease along the image toward to the apex
c. Teeth foreshortened or elongated
d. All of there above are correct
➢ b. Distortion tends to decrease along the image toward to the apex
INCREASE
Which of the following is a method to minimize loss of image clarity?
a. Use as small a focal spot as practical
b. Minimize distance from the focal spot to the object
c. Increase distance from the object to the film/sensor
d. All of the above
➢ Use as small a focal spot as practical
b. Increase distance
c. Minimize distance
,True or false:
If focal spot is increased, sharpness will be decreased but it can handle heat better.
True.
Select all of the the ways to minimize image size distortion:
a. Increasing the focal spot to film/sensor distance
b. Decreasing the focal spot to film/sensor distance
c. Increasing the object to film/sensor distance
d. Decreasing the object to film/sensor distance
➢ A and D
Select all of the ways to minimize image shape distortion:
a. Position film/sensor parallel to long axis of object
b. Orient central ray perpendicular to object & film/sensor
c. Increasing the object to film/sensor distance
➢ A and B
Which object localization technique uses two radiographs of an object at different
angles and employs the "SLOB" acronym?
a. Tube shift technique
b. Right-angle technique
➢ Tube shift technique
What size film should you use for occlusal radiographs on adults? On children?
➢ 4 for adults
2 for children
, Which of the following is an application for occlusal radiographs?
a. Large lesion: tumor or cyst
b. Sialolith
c. Foreign object location
d. Fracture
e. Infection
f. All of the above
➢ f. All of the above
Which of the following is not a common occlusal radiograph projection?
a. Maxillary Anterior
b. Maxillary Standard
c. Maxillary Lateral
d. Mandibular Anterior
e. Mandibular Lateral
f. Mandibular True
➢ e. Mandibular Lateral
Which of the following projections is take in the sagittal (median) plane (select all that
apply)?
a. Lateral Cephalometric
b. Submentovertex
c. Waters
d. Posteroanterior (PA) Cephalometric
e. Reverse-Towne
f. Panoramic
➢ Lateral Cephalometric
(100% Correct Answers)
True or false:
Occlusal radiographs utilize the bisecting-angle technique.
➢ True.
Dr. Yang said this verbally on first slide of lecture
Which is false regarding paralleling technique?
a. It is the preferred technique
b. Film or sensor is not close to teeth, but parallel to the long axis of teeth
c. Central rays are parallel to the long axis of teeth and film/sensor
d. Minimal distortion with anatomic accuracy
e. All of the above are true
➢ c. Central rays are parallel to the long axis of teeth and film/sensor
PERPENDICULAR
Which is false regarding the paralleling technique?
a. Film/sensor must be parallel to the tooth long axis
b. Central rays must be perpendicular to film/sensor
c. Central rays must be perpendicular to teeth
d. There is an increased focal spot-film/sensor distance
e. Film/sensor holder & beam alignment device are not required
➢ e. Film/sensor holder & beam alignment device are not required
XCP is required
,Film/sensor is close to teeth, but not parallel to the long axis of teeth. Central ray
perpendicular to an imaginary plane that bisects the angle b/w teeth & film/sensor.
a. Paralleling technique
b. Bisecting-angle technique
➢ b. Bisecting-angle technique
Which of the following is incorrect regarding the bisecting angle technique?
a. There is dimensional distortion with inherent anatomic inaccuracy.
b. Distortion tends to decrease along the image toward to the apex
c. Teeth foreshortened or elongated
d. All of there above are correct
➢ b. Distortion tends to decrease along the image toward to the apex
INCREASE
Which of the following is a method to minimize loss of image clarity?
a. Use as small a focal spot as practical
b. Minimize distance from the focal spot to the object
c. Increase distance from the object to the film/sensor
d. All of the above
➢ Use as small a focal spot as practical
b. Increase distance
c. Minimize distance
,True or false:
If focal spot is increased, sharpness will be decreased but it can handle heat better.
True.
Select all of the the ways to minimize image size distortion:
a. Increasing the focal spot to film/sensor distance
b. Decreasing the focal spot to film/sensor distance
c. Increasing the object to film/sensor distance
d. Decreasing the object to film/sensor distance
➢ A and D
Select all of the ways to minimize image shape distortion:
a. Position film/sensor parallel to long axis of object
b. Orient central ray perpendicular to object & film/sensor
c. Increasing the object to film/sensor distance
➢ A and B
Which object localization technique uses two radiographs of an object at different
angles and employs the "SLOB" acronym?
a. Tube shift technique
b. Right-angle technique
➢ Tube shift technique
What size film should you use for occlusal radiographs on adults? On children?
➢ 4 for adults
2 for children
, Which of the following is an application for occlusal radiographs?
a. Large lesion: tumor or cyst
b. Sialolith
c. Foreign object location
d. Fracture
e. Infection
f. All of the above
➢ f. All of the above
Which of the following is not a common occlusal radiograph projection?
a. Maxillary Anterior
b. Maxillary Standard
c. Maxillary Lateral
d. Mandibular Anterior
e. Mandibular Lateral
f. Mandibular True
➢ e. Mandibular Lateral
Which of the following projections is take in the sagittal (median) plane (select all that
apply)?
a. Lateral Cephalometric
b. Submentovertex
c. Waters
d. Posteroanterior (PA) Cephalometric
e. Reverse-Towne
f. Panoramic
➢ Lateral Cephalometric
