Deck 29: Radiographic Techniques for Specific Oral Conditions

Question 1

Which of these dental practitioners would most likely use a lateral cephalometric radiograph to assess growth and development?

A) A general practitioner
B) An orthodontist
C) A periodontist
D) An endodontist

Answer 1

An orthodontist

Question 2

Which of the following is the device that transfers x?ray energy into visible light?

A) The grid
B) The cassette
C) The cephalostat
D) The intensifying screen

Answer 2

The intensifying screen

Question 3

Which of the following statements regarding intensifying screens is correct?

A) The larger the crystal size, the more radiation required to produce an image.
B) The thicker the emulsion, the faster the speed of the screen.
C) Larger crystals produce an image with greater resolution than smaller crystals.
D) Calcium tungstate crystals produce a latent image with less radiation exposure than rare earth screens.

Answer 3

The thicker the emulsion, the faster the speed of the screen.

Question 4

Which of these extraoral radiographs is most often used to show the base of the skull?

A) Lateral cephalometric
B) Transcranial
C) Submentovertex
D) Posteroanterior

Question 5

The exposure settings used for extraoral radiographs depend on each of the following EXCEPT one. Which one is the EXCEPTION?

A) The patient's size
B) The tissue density
C) The film-screen combination
D) The developer temperature

Question 6

Extraoral radiographs are useful for each of the following EXCEPT one. Which one is the EXCEPTION?

A) Unexplained gingival bleeding
B) Growth and development
C) Suspected impactions
D) A patient with limited ability to open the mouth

Question 7

Which of the following statements regarding grids is correct?

A) They may be used with both intraoral and extraoral radiography.
B) They are composed of thin lead strips alternating with a radiolucent material.
C) They reduce the amount of radiation needed to produce an image.
D) They may add to the potential to increase film fog.

Question 8

Which of these extraoral radiographs is most often used to aid in diagnosing temporomandibular joint problems?

A) Lateral skull projection
B) Transcranial projection
C) Reverse Towne projection
D) Posteroanterior projection

Question 9

Extraoral film should be removed from the box under safelight conditions using:

A) clean, dry hands.
B) patient treatment gloves.
C) plastic overgloves.
D) nitrile utility gloves.

Question 10

Which of these statements regarding cassettes is FALSE?

A) A rigid cassette has a front and back cover joined together with a hinge.
B) The front and back covers of rigid cassettes are constructed of plastic to permit the passage of x-rays.
C) Cassettes hold the intensifying screens in close contact with the film.
D) A pair of intensifying screens is located inside the front and back covers of a rigid cassette.

Question 11

Which of these extraoral radiographs is most often used to examine the sinuses?

A) Waters
B) Reverse Towne
C) Submentovertex
D) Lateral cephalometric

Question 12

Which of the following determines the exposure factors for extraoral techniques?

A) Intensifying screen-film combination
B) The patient's size and tissue density
C) Target-film distance
D) All of the above

Question 13

Each of the following statements regarding extraoral film is correct EXCEPT one. Which one is the EXCEPTION?

A) It is individually packaged in the same manner as intraoral films.
B) It should not be handled with latex or vinyl treatment gloves.
C) It is more sensitive than intraoral film.
D) It is used in conjunction with a pair of intensifying screens.

Question 14

Which of these is NOT an identification method for labeling extraoral radiographs?

A) Embossed identification dot
B) Commercial film ID imprinters
C) Lead letters
D) Lead plates or tape

Question 15

Each of the following statements regarding extraoral film is correct EXCEPT one. Which one is the EXCEPTION?

A) Handle by the edges only.
B) Remove from the box slowly.
C) Slide across the intensifying screens when placing it in the cassette.
D) Load into the cassette just prior to use.

Question 16

Which of the following is least likely to use extraoral radiography?

A) An orthodontist
B) A prosthodontist
C) An endodontist
D) An oral surgeon

Question 17

Which of these statements is FALSE?

A) Poor screen-film contact results in a blurry image.
B) Cassettes should be checked for warping to ensure close screen-film contact.
C) Intensifying screens should be cleaned weekly.
D) Cassette hinges and snaps should be checked to ensure light-tightness.

Question 18

Each of the following statements regarding intensifying screens is correct EXCEPT one. Which one is the EXCEPTION?

A) They work in pairs.
B) They require less radiation to produce an image.
C) They transfer x-ray energy into visible light.
D) They are sensitive to white-light exposure.

Question 19

The patient's exposure to radiation is increased over intraoral radiographs when using intensifying screens because extraoral film is more sensitive to light than intraoral film.

A) Both the statement and reason are correct and related.
B) Both the statement and reason are correct but NOT related.
C) The statement is correct, but the reason is NOT.
D) The statement is NOT correct, but the reason is correct.
E) NEITHER the statement NOR the reason is correct.

Question 20

Interchanging green- and blue-light-sensitive films between calcium tungstate and rare earth screens would produce:

A) increased image sharpness.
B) faster film speeds.
C) latent images with less radiation.
D) undiagnostic radiographic images.

Question 21

Latex or vinyl treatment gloves should be used to handle extraoral films.

Question 22

Calcium tungstate or barium strontium sulfate will fluoresce and emit energy in the form of green light when they absorb x-rays.

Question 23

A cephalometric radiograph is used to evaluate the position and orientation of the condyles and to detect fractures of the zygomatic arch.

Question 24

Extraoral film is packaged in a similar manner to intraoral films.

Question 25

Extraoral film should be loaded in the cassette just prior to use.

Question 26

The radiographic technique that uses simultaneous movement of the x-ray source and the image receptor to record images of structures located within a selected plane of tissue while blurring structures outside the selected plane is called "tomography."

Question 27

Intensifying screens transfer x-ray energy into visible light.

Question 28

Cone beam computed tomography (CBCT) is computed tomography technology dedicated to dental applications.

Question 29

Extraoral radiographs cannot be substituted for intraoral radiographs.

Question 30

A static charge can result in a radiographic artifact.

Question 31

Orthodontists frequently use extraoral radiographs.

Question 32

When placing a film into a cassette, it should be slid across the intensifying screens to ensure that it lies as close to the screens as possible.

Question 33

A cephalometric radiograph images the entire skull from the side and is often called a "lateral cephalometric radiograph."

Question 34

In film-based radiography, when using a cassette, it is necessary to use intensifying screens.

Question 35

Intensifying screens intensify the x-ray beam.

Question 36

Extraoral films are more sensitive to light than intraoral films.

Question 37

Certain darkroom safelights that are safe for intraoral films may not be safe for extraoral films.

Question 38

A grid is a device used in extraoral radiography to prevent scatter radiation from fogging the image receptor.

Question 39

A transcranial radiograph evaluates the maxillary, frontal, and ethmoid sinuses.

Question 40

Rare earth screens give off a blue to violet fluorescent light and must be paired with blue-light-sensitive film.

Question 41

What is the purpose of a Waters projection?

Question 42

Of what is a grid used in extraoral radiographic techniques composed?

Question 43

What is a lateral cephalometric radiograph?

Question 44

Of what is the back cover of a rigid extraoral film cassette constructed?

Question 45

What type of gloves are required when handling extraoral film in the darkroom?

Question 46

How many intensifying screens are inside a cassette?

Question 47

Of what is the front cover of a rigid extraoral film cassette constructed?

Question 48

Why should cassettes and intensifying screens be examined prior to use?

Question 49

What is the purpose of the lateral jaw radiograph?

Question 50

Do extraoral films have an embossed identification dot to determine the right and left sides?