Deck 15: The Bitewing Examination

Question 1

Which of these is NOT a disadvantage of the bisecting technique?

A) It produces images with dimension distortion.
B) Image receptor positioning is difficult for patients with small mouths.
C) Adjacent structures are often superimposed.
D) Estimating the location of the imaginary bisecting may be difficult.

Answer 1

Image receptor positioning is difficult for patients with small mouths.

Question 2

The bisecting technique is useful in patients who cannot tolerate parallel placement of the image receptor. The bisecting technique produces images with reduced image distortion.

A). The first statement is true. The second statement is false.
B) The first statement is false. The second statement is true.
C) Both statements are true.
D) Both statements are false.

Answer 2

. The first statement is true. The second statement is false.

Question 3

Which of the following will correct a foreshortened image?

A) Increasing the vertical angulation
B) Decreasing the vertical angulation
C) Directing the central ray perpendicular to the plane of the image receptor
D) Directing the central ray perpendicular to the long axis of the tooth

Answer 3

Decreasing the vertical angulation

Question 4

Which of the following will correct an overlapping error?

A) Increasing the vertical angulation
B) Decreasing the vertical angulation
C) Directing the central ray perpendicular to the plane of the image receptor
D) Directing the central ray perpendicular to the long axis of the tooth

Question 5

The recommended vertical angulation for exposing a mandibular molar periapical radiograph using the bisecting technique is:

A) -10 degrees
B) -15 degrees
C) -20 degrees
D) -5 degrees

Question 6

Which of the following statements regarding image receptor holders is FALSE?

A) Short bite blocks should be used for the bisecting technique.
B) External aiming devices help locate correct angles and points of entry.
C) External aiming devices eliminate the need to position the patient's head precisely.
D) Bite blocks with an L-shaped back plate should be used with the bisecting technique.

Question 7

The recommended vertical angulation for exposing a maxillary premolar periapical radiograph using the bisecting technique is:

A) +20 degrees
B) +30 degrees
C) +40 degrees
D) +45 degrees

Question 8

The recommended vertical angulation for exposing a maxillary canine periapical radiograph using the bisecting technique is:

A) +20 degrees
B) +30 degrees
C) +40 degrees
D) +45 degrees

Question 9

Which of these image receptor holders is designed for use with the bisecting technique?

A) XCP
B) XCP-DS
C) Snap-A-Ray
D) RAPD

Question 10

Which of the following will correct an elongated image?

A) Increasing the vertical angulation
B) Decreasing the vertical angulation
C) Directing the central ray perpendicular to the plane of the image receptor
D) Directing the central ray perpendicular to the long axis of the tooth

Question 11

The recommended vertical angulation for exposing a mandibular incisor periapical radiograph using the bisecting technique is:

A) -10 degrees
B) -15 degrees
C) -20 degrees
D) -5 degrees

Question 12

Which of the following best describes the correct vertical direction of the central ray when using the bisecting technique?

A) 90 degrees to the long axes of the teeth
B) 90 degrees to the plane of the image receptor
C) 90 degrees to the long axes of the teeth and the plane of the image receptor
D) 90 degrees to the imaginary bisector

Question 13

Which of the following is true of the bisecting technique?

A) It is easy to standardize subsequent films.
B) There is increased patient comfort during image receptor placement.
C) There is decreased radiation exposure for the patient.
D) It is less likely to cause image distortion.

Question 14

The recommended vertical angulation for exposing a maxillary incisor periapical radiograph using the bisecting technique is:

A) +20 degrees
B) +30 degrees
C) +40 degrees
D) +45 degrees

Question 15

The recommended vertical angulation for exposing a mandibular premolar periapical radiograph using the bisecting technique is:

A) -10 degrees
B) -15 degrees
C) -20 degrees
D) -5 degrees

Question 16

Which of the following statements regarding patient preparation for dental radiography is NOT correct?

A) The patient should be protected with a lead/lead-equivalent apron and thyroid collar.
B) The patient's occipital protuberance should be against the headrest during exposure.
C) The patient's eyeglasses may be left in place to protect the eyes.
D) Objects in the mouth such as dentures, partials, and retainers should be removed prior to exposure.

Question 17

The recommended vertical angulation for exposing a mandibular canine periapical radiograph using the bisecting technique is:

A) -10 degrees
B) -15 degrees
C) -20 degrees
D) -5 degrees

Question 18

The presence of each of the following conditions may indicate using the bisecting technique instead of the paralleling technique EXCEPT one. Which one is the EXCEPTION?

A) A class II malocclusion
B) An edentulous region
C) A large palatal or mandibular tori
D) A very low or shallow palatal vault

Question 19

The recommended vertical angulation for exposing a maxillary molar periapical radiograph using the bisecting technique is:

A) +20 degrees
B) +30 degrees
C) +40 degrees
D) +45 degrees

Question 20

To determine the vertical angulation when using the bisecting technique, the central rays of the x-ray beam should be directed:

A) perpendicular to the image receptor.
B) parallel to the image receptor.
C) perpendicular to the imaginary bisector.
D) parallel to the imaginary bisector.

Question 21

Specific vertical angulations required when using the bisecting technique differ from those used with the paralleling technique.

Question 22

An isometric triangle is a triangle with sides that are inversely related to the base.

Question 23

The goal of accurate bisecting technique is to direct the central ray of the x-ray beam perpendicular to both the long axes of the teeth and the plane of the image receptor simultaneously.

Question 24

Careful attention to the steps of the bisecting technique can produce acceptable radiographs.

Question 25

The bisecting technique is applied when the image receptor cannot be placed parallel to the long axes of the teeth.

Question 26

Excessive vertical angulation when using the bisecting technique will elongate the image.

Question 27

Changes in vertical angulation are indicated when the patient's palatal vault is high or low.

Question 28

Even when the positioning and angulation steps are accurate and precise, the bisecting technique will produce some dimension distortion.

Question 29

The two planes that can be visualized by the radiographer are the estimated long axis of the tooth and the plane of the image receptor.

Question 30

The seating position of the patient is not important in using predetermined anatomical landmarks to direct the central ray of the x-ray beam toward the point of entry.

Question 31

It is possible to place the image receptor close to the mandibular molars and still achieve a parallel relationship between the image receptor and the long axes of the teeth.

Question 32

Because it satisfies fewer shadow-casting principles, the bisecting technique is less likely to produce superior diagnostic-quality radiographs.

Question 33

It is possible to place the image receptor close to the maxillary anterior teeth and still achieve a parallel relationship between the image receptor and the long axes of the teeth.

Question 34

When using the bisecting technique, the patient should bite down on the image receptor bite block as close to the teeth as necessary.

Question 35

The patient must be seated correctly to use predetermined vertical angulations when employing the bisecting technique.

Question 36

To avoid conecut error when using the bisecting technique, the point of entry should be the occlusal plane of the teeth.

Question 37

When using the bisecting technique, because the long axis of the tooth and the plane of the image receptor are not parallel, a shorter target-image receptor distance will increase magnification and distortion.

Question 38

A longer 12-inch or 16-inch PID is better suited to the bisecting technique.

Question 39

Using the bisecting technique, the image receptor is placed parallel to the long axes of the teeth.

Question 40

The horizontal angulation is determined in the same manner for both the bisecting and the paralleling techniques.

Question 41

What must the radiographer do prior to confidently using predetermined vertical angulations when applying the bisecting technique?

Question 42

Describe the error that results when excessive vertical angulation is used when taking periapical radiographs using the bisecting technique.

Question 43

How does the central ray of the x-ray beam intersect with the image receptor and the teeth of interest when using the bisecting technique?

Question 44

Describe the error that results when inadequate vertical angulation is used when taking periapical radiographs using the bisecting technique.

Question 45

Which of the two techniques for obtaining intraoral radiographs may be easier to use for children or adults with shallow palates?

Question 46

Why is it important for the radiographer to know how to apply both the paralleling and bisecting techniques?

Question 47

To determine accurate and correct angles and points of entry, how should the patient be positioned?

Question 48

Name an image receptor holder that may be used with both the paralleling and the bisecting techniques.

Question 49

Explain how the bisecting technique relates to the rule of isometry.

Question 50

What is the preferred target-surface distance when using the bisecting technique?