Deck 13: Extraoral Techniques

Question 1

Extraoral film is available in which sizes?

A)5 $\times$ 7-inch or 8 $\times$ 10-inch
B)4 $\times$ 4-inch or 8 $\times$ 10-inch
C)4 $\times$ 6-inch or 8 $\times$ 12-inch
D)5 $\times$ 12-inch and 6 $\times$ 12-inch

Answer 1

5 $\times$ 7-inch or 8 $\times$ 10-inch

Question 2

The best extraoral projection to detect a fracture of the zygomatic arch is the posterioranterior projection.

Answer 2

False

Question 3

Identify the projection used to view the maxillary sinus and middle third of the face:

A)lateral skull.
B)Waters' view.
C)lateral oblique.
D)submentovertex.

Answer 3

Waters' view.

Question 4

Identify the projection used to view the entire skull in the sagittal plane:

A)lateral skull.
B)Waters' view.
C)lateral oblique.
D)submentovertex.

Question 5

For the submentovertex projection,the patient is positioned with the nose and forehead touching the receptor.The central ray is directed at a zero-degree vertical angulation,aimed at the external occipital protuberance.For the posteroanterior projection,the cassette is positioned on the vertex of the patient's skull,and the central ray is directed from underneath the patient's chin (menton)perpendicular to the cassette.

A)Both statements are true.
B)Both statements are false.
C)First statement is true,second is false.
D)First statement is false,second is true.

Question 6

The limitation for using the posterior anterior projection for visualizing the maxillary sinus is:

A)exposure time.
B)patient positioning.
C)superimposition of the zygomatic arch.
D)superimposition of the maxillary tuberosity.

Question 7

The Waters' projection is useful for the diagnosis of what?

A)Parotid gland
B)Impacted teeth
C)Maxillary sinus
D)Mandibular molars

Question 8

What is the target-receptor distance (FFD)for the Water's View?

A)14 inches
B)16 inches
C)20 inches
D)36 inches

Question 9

The use of grids for extraoral radiography is not common in dental practice and is mostly confined to cephalometric and TMJ radiographs.The function of the grid is to decrease the amount of scatter radiation originating in the object.

A)Both statements are true.
B)Both statements are false.
C)First statement is true,second is false.
D)First statement is false,second is true.

Question 10

All of the following are indications for use of extraoral radiography EXCEPT one.Which one is the EXCEPTION?

A)Patients with trismus
B)Handicapped patients
C)Patients needing a periapical
D)Temporomandibular joint ankylosis

Question 11

The lateral oblique projection of the mandible is used for surveying one side of the mandible entirely from the distal of the canine to the angle of the ramus,the ramus,condyle,and coronoid process.

Question 12

Which of the following methods is best for radiographing an impacted third molar?

A)Lateral skull
B)Posterior anterior
C)Posterior anterior of the sinuses
D)Lateral oblique projection of the mandible

Question 13

Extraoral films are processed:

A)by sight development.
B)only with automatic processors.
C)with a safelight of less intensity.
D)in the same manner as intraoral films.

Question 14

The extraoral projection used in cephalometric analysis is the lateral skull projection.

Question 15

For patients with bilateral mandibular impactions,the right and left lateral oblique techniques have been replaced by:

A)occlusal films.
B)panoramic films.
C)lateral skull projections.
D)posterior anterior projections.

Question 16

Which of the following is the average exposure time for an adult for a lateral skull projection?

A)60 kV and 10 mA would be 8 to 10 impulses
B)60 kV and 15 mA would be 8 to 15 impulses
C)65 kV and 10 mA would be 8 to 10 impulses
D)65 kV and 10 mA would be 8 to 15 impulses

Question 17

Identify the projection used to view the sphenoid and ethmoid sinuses:

A)lateral skull.
B)Waters' view.
C)posteroanterior.
D)submentovertex.

Question 18

Depending on the type of panoramic unit,rigid or flexible cassettes are used.

Question 19

Cassettes with intensifying screens are used in extraoral radiography to increase patient exposure.

Question 20

Identify the projection used in tomography as a scout film to determine condylar position:

A)Waters' view.
B)lateral oblique.
C)posteroanterior.
D)submentovertex.