Deck 20: Exposure and Technique Errors

Question 1

Which of the following choices may be the cause of an unexposed film?

A) Excessive exposure time
B) Failure to turn on the x-ray machine
C) Excessive kilovoltage
D) Excessive milliamperage

Answer 1

Failure to turn on the x-ray machine

Question 2

To prevent underexposure, check and increase ____ as needed.
1) Exposure time
2) Kilovoltage
3) Milliamperage

A)1, 2, 3
B)1, 2
C)2, 3
D)1, 3

Answer 2

1, 2, 3

Question 3

When the distal surfaces of the canines are not visible on a premolar bite-wing film, the solution is to:

A) Change the horizontal angulation of the tubehead.
B) Increase the vertical angulation of the tubehead.
C) Decrease the vertical angulation of the tubehead.
D) Position the anterior edge of the film at the midline of the mandibular canine.

Answer 3

Position the anterior edge of the film at the midline of the mandibular canine.

Question 4

To prevent a dropped film corner:

A) Change the horizontal angulation.
B) Increase the vertical angulation.
C) Decrease the vertical angulation.
D) Make certain the edge of the film is placed parallel to the incisal-occlusal surfaces of the teeth.

Question 5

Which of the following films would most likely appear black?

A) An unexposed film
B) A film exposed to light
C) An overexposed film
D) An underexposed film

Question 6

When the occlusal plane appears tipped or tilted, the error is a(n):

A) Incorrect horizontal angulation.
B) Incorrect vertical angulation.
C) Dropped film corner.
D) Elongated image.

Question 7

When overlapped contacts appear on film, the cause is:

A) Incorrect vertical angulation.
B) Incorrect horizontal angulation.
C) A dropped receptorcorner.
D) An underexposed film.

Question 8

A cone cut occurs when:

A) The film is underexposed.
B) The film is overexposed.
C) The PID was not properly aligned with the periapical film holder.
D) The exposure button was not depressed for a sufficient amount of time.

Question 9

Short teeth with blunted roots appear on the film when:

A) The vertical angulation is excessive.
B) The vertical angulation is insufficient.
C) The horizontal angulation is incorrect.
D) There is a cone-cut.

Question 10

A thin radiolucent line appears on the film with:

A) Film creasing.
B) Film bending.
C) Double exposure.
D) Patient movement.

Question 11

When the third molar regions are not visible on a molar bite-wing film, the solution is to:

A) Decrease the vertical angulation of the tubehead.
B) Increase the vertical angulation of the tubehead.
C) Position the anterior edge of the film at the midline of the mandibular first premolar.
D) Position the anterior edge of the film at the midline of the mandibular second premolar.

Question 12

An unexposed film appears:

A) Clear
B) Black
C) Dark
D) Light

Question 13

To avoid overlapped contacts on periapical film:

A) Increase vertical angulation.
B) Decrease vertical angulation.
C) Direct the x-ray beam through the interproximal regions.
D) Make certain that no more than inch of the film edge extends beyond the incisal-occlusal surfaces of the teeth.

Question 14

With ____, images appear stretched and distorted.

A) Film creasing
B) Film bending
C) Double exposure
D) Patient movement

Question 15

The possibility of exposure of radiographic film to white light can be reduced by:

A) Turning off the safelight and unwrapping the films in a pitch-dark room.
B) Pre-exposing the entire package of film to radiation before opening the package.
C) Not unwrapping the film in a room with white light.
D) Turning off the fluorescent lighting in the treatment room before exposing radiographic films.

Question 16

An underexposed film results from:

A) Insufficient exposure time.
B) Inadequate tissue density.
C) Excessive milliamperage.
D) Excessive kilovoltage.

Question 17

To correct a film where apices do not appear:

A) Make certain that no more than 3/4 inch of the film edge extends beyond the incisal-occlusal surfaces of the teeth.
B) Make certain that no more than 1/8 inch of the film edge extends beyond the incisal-occlusal surfaces of the teeth.
C) Increase the exposure time.
D) Direct the x-ray beam through the interproximal spaces.

Question 18

The cause of an excessive margin of film edge (which appears as a black band) on a nondiagnostic periapical film is:

A) The edge of the film was not placed parallel to the incisal-occlusal surfaces of the teeth.
B) The film was not positioned in the patient's mouth to cover the apical regions of the teeth.
C) The film was underexposed.
D) The central ray was not directed through the interproximal spaces.

Question 19

The appearance of a patient's finger on the film is called a:

A) Hemangioma
B) Phalangioma
C) Myxoma
D) Pericytoma

Question 20

Long, distorted teeth appear on the film when:

A) The vertical angulation is excessive.
B) The vertical angulation is insufficient.
C) The horizontal angulation is incorrect.
D) There is a cone-cut.

Question 21

What is the cause of a double exposure?

A) The patient moved during film exposure.
B) Two radiographs were stuck together during film exposure.
C) A double packet of film was used.
D) The film was exposed in the patient's mouth twice.

Question 22

Blurred images appear on the film when:

A) There is patient movement.
B) The film is reversed.
C) There is a double exposure.
D) The film is creased.

Question 23

When the film is reversed, the image will be:

A) Elongated.
B) Distorted.
C) Light with a herringbone pattern.
D) Blurred.

Question 24

To avoid a double exposure:

A) Only expose and process one half of the patient's mouth at one time.
B) Mark exposed films with indelible ink.
C) Always separate exposed and unexposed films.
D) Ask the patient to hold the unexposed films.