Chapter 07: Dental X–Ray Film
Iannucci: Dental Radiography, 5th Edition
MULTIPLE CHOICE
1. Which of the following statements is true regarding dental x-ray film and formation of the
latent image?
a.
The film is placed to the buccal of the teeth.
b.
The film is placed to the lingual of the teeth.
c.
A periapical film is an extraoral film.
d.
A bite-wing film is an extraoral film.
2. Which component of x-ray film has a suspension of millions of microscopic silver halide
crystals?
a.
Film base
b.
Adhesive layer
c.
Gelatin
d.
Halide crystals
3. The film base is a flexible piece of
a.
shellac.
b.
cardboard.
c.
acetate.
d.
polyester plastic.
4. The film base is transparent with a slight ________ tint used to emphasize contrast and
enhance image quality.
a.
amber
b.
red
c.
blue
d.
green
5. The film base is ____ mm thick.
a.
0.02
b.
0.2
c.
2.0
d.
20
6. The adhesive layer is added to the _________ before the __________ is (are) applied.
a.
gelatin; halide crystals
b.
halide crystals; gelatin
c.
film base; emulsion
d.
emulsion; film base
7. The film emulsion is
a.
attached to both sides of the film.
b.
attached to one side of the film.
c.
made of polyester plastic.
d.
opaque to block out the passage of light.
8. The film emulsion is composed of a homogenous mixture of
a.
calcium tungstate and lead salt crystals.
b.
gelatin and barium salt crystals.
c.
gelatin and silver halide crystals
d.
primer and silver halide crystals.
9. ___________ is the main component of the silver halide crystals in dental x-ray film.
a.
Iodide
b.
Bromide
c.
Chloride
d.
Fluoride
10. The latent image is stored by the ______________ in dental x-ray film.
a.
gelatin
b.
film base
c.
adhesive layer
d.
silver halide crystals
11. The areas of the film that are _______ energized will be ________ when the film is processed.
1. more; darker
2. more; lighter
3. less; darker
4. less; lighter
a.
1 and 3
b.
1 and 4
c.
2 and 3
d.
2 and 4
12. The invisible pattern of stored energy on the exposed film is called the
a.
variable density pattern.
b.
latent image.
c.
x-ray photon.
d.
emulsion.
13. Latent image centers are aggregates of
a.
silver bromide crystals.
b.
bromine atoms.
c.
neutral silver atoms.
d.
gelatin.
14. During formation of the latent image, irregularities in the lattice structure of the exposed
crystal, known as _________________, attract silver atoms.
a.
the protective layer
b.
the emulsion
c.
sensitivity specks
d.
the adhesive layer
15. Which of the following types of dental x-ray film would you place inside your patient’s
mouth?
a.
Intraoral film
b.
Extraoral film
c.
Duplicating film
d.
Screen film
16. Which of the following statements is true of a two-film packet?
a.
A two-film packet requires twice the amount of exposure to produce a single
radiograph.
b.
A two-film packet has a single emulsion, whereas a one-film packet has a double
emulsion.
c.
A two-film packet has a double emulsion, whereas a one-film packet has a single
emulsion.
d.
Intraoral x-ray film is a double-emulsion type of film regardless of whether the
film packet contains one or two films.
17. A two-film packet requires ___________ exposure time as a one-film packet.
a.
half the
b.
the same
c.
twice the
d.
four times the
18. When would you use a two-film packet when taking radiographs on your patient?
a.
For maxillary radiographs where the bone is denser than in the mandible.
b.
To prevent more photons from passing through the film into patient tissue.
c.
When a duplicate record of a radiographic examination is needed.
d.
Routinely for adults; however, a one-film packet should be used for children and
adolescents.
19. Why would you use the identification dot when taking radiographs?
a.
To determine film orientation
b.
To identify whether or not a film has been exposed
c.
To indicate the side of the film with an emulsion
d.
To identify whether the film is D-speed film or F-speed film
20. What is the purpose of the lead foil sheet found within the film packet?
a.
To cover the film and shield the film from light
b.
To protect the film from moisture
c.
To shield the film from primary radiation emitted by the x-ray tubehead
d.
To shield the film from secondary backscattered radiation
21. Where is the thin lead foil sheet positioned in the film packet?
a.
Behind the film
b.
In front of the film
c.
Behind the paper film wrapper
d.
In front of the paper film wrapper
22. The embossed pattern placed on the lead foil sheet by the manufacturer will reveal
a.
whether or not the film has been exposed.
b.
if the film has been exposed to moisture.
c.
if the film packet is inadvertently positioned in the mouth backward and then
exposed.
d.
if the film packet is inadvertently opened before the film is processed.
23. When you are placing the film packet in your patient’s mouth, which side of the film packet
would you place toward the patient’s teeth?
a.
The side with the flap that is used to open the dental film
b.
The solid white side
c.
The color-coded side
d.
The identification dot side
24. The label side of the dental film packet
a.
is solid white.
b.
has a raised bump in one corner that corresponds to the identification dot.
c.
should face the tubehead when placed in the mouth.
d.
is color-coded to distinguish between one-film and two-film packets and between
film speeds.
25. Your dentist asks you to take radiographs on your patient in order to check the interproximal
surfaces of the posterior maxillary and mandibular teeth for decay. Which type of film would
be the best to take the radiograph?
a.
Maxillary and mandibular periapical film
b.
Panoramic film
c.
Bite-wing film
d.
Occlusal film
26. The apex (tip) of the tooth roots may be seen on which type(s) of intraoral film?
a.
Periapical
b.
Bite-wing
c.
Occlusal
d.
Periapical and occlusal
27. Which type of intraoral film is best for visualizing interproximal surfaces?
a.
Periapical
b.
Bite-wing
c.
Occlusal
d.
Periapical and occlusal
28. Which of the following film should you use on your young pediatric patient if you need to get
a radiograph of her maxillary teeth and maxilla?
a.
Periapical
b.
Bite-wing
c.
Occlusal
d.
Periapical and occlusal
29. Which film size would you use to take posterior periapical radiographs on your adult patient?
a.
0
b.
1
c.
2
d.
4
30. You are taking bite-wing radiographs on a 3-year-old child. Which size film should you use?
a.
0
b.
1
c.
2
d.
3
31. Which size film should you use to take a bite-wing film on your adult patient?
a.
0
b.
1
c.
2
d.
3
32. A fast film responds more quickly than a slow film, because
a.
the tubehead shutter opens wider.
b.
exposure times are longer for fast films.
c.
the silver halide crystals in the emulsion are larger.
d.
a different processing chemistry is used.
33. Which of the following film speed is the fastest film currently available?
a.
C-speed film
b.
D-speed film
c.
E-speed film
d.
F-speed film
34. Which of the following types of film exhibits the bony and soft tissue areas of the facial
profile?
a.
Periapical
b.
Bite-wing
c.
Panoramic
d.
Cephalometric
35. Your adolescent patient is scheduled for an orthodontic evaluation and needs a single
radiograph of his side facial profile that includes his skeletal structure, tissues, jaws, and teeth.
Which one of the following radiographs should you take?
a.
Periapical
b.
Bite-wing
c.
Panoramic
d.
Cephalometric
36. Screen film
a.
is sensitive to direct exposure to radiation.
b.
is sensitive to fluorescent light.
c.
requires more exposure time than nonscreen film.
d.
is not recommended for use in dentistry.
37. A screen that produces a green light must be paired with a __________-sensitive screen film.
a.
red
b.
yellow
c.
blue
d.
green
38. (1) An intensifying screen is a device that transfers x-ray energy into visible light; (2) the
visible light, in turn, exposes the screen film.
a.
Both statements are true.
b.
Both statements are false.
c.
The first statement is true; the second statement is false.
d.
The first statement is false; the second statement is true.
39. An intensifying screen is a smooth plastic sheet coated with minute fluorescent crystals
known as
a.
nuclei of crystallization.
b.
germinal centers.
c.
sensitivity specks.
d.
phosphors.
40. Rare earth screens
a.
have phosphors that emit blue light.
b.
have phosphors that emit green light.
c.
are less efficient than calcium tungstate intensifying screens.
d.
are slower than calcium tungstate intensifying screens.
41. Lack of contact between screen and film results in
a.
an overexposed film.
b.
an underexposed film.
c.
a light leak.
d.
a loss of image sharpness.
42. Duplicating film
a.
is exposed to x-rays.
b.
has emulsion on both sides.
c.
is used to make an identical copy of an intraoral or extraoral radiograph.
d.
is the second film in a two-film intra-oral film packet.
43. Film is best stored in an area that is
a.
hot.
b.
humid.
c.
cool and dry.
d.
exposed to radiation.
44. The optimum temperature for film storage ranges from ____ to ____ degrees Fahrenheit.
a.
30; 50
b.
50; 70
c.
70; 90
d.
90; 110
45. (1) Non-screen film is sensitive to fluorescent light. (2) Screen films are sensitive to the
visible light emitted from the intensifying screen.
a.
Both statements are true.
b.
Both statements are false.
c.
The first statement is true; the second statement is false.
d.
The first statement is false; the second statement is true.
46. (1) A panoramic radiograph is an example of an intraoral film. (2) An occlusal radiograph is
an example of an extraoral film.
a.
Both statements are true.
b.
Both statements are false.
c.
The first statement is true; the second statement is false.
d.
The first statement is false; the second statement is true.