Chapter 14

Question 2

What is the bisecting technique useful for?

Answer 2

The bisecting technique is useful in patients who cannot tolerate parallel placement of the image receptor.

Question 3

What is a major advantage of the bisecting technique?

Answer 3

Its ease of use with patients who cannot tolerate parallel placement of the image receptor.

Question 4

What is a major disadvantage of the bisecting technique?

Answer 4

The inherent dimensional distortion.

Question 5

Which statement is true regarding the bisecting technique?

Answer 5

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

Question 6

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

Answer 6

B) Image receptor positioning is difficult for patients with small mouths.

Question 7

Which image receptor holder is designed for use with the bisecting technique?

Answer 7

A) 105-degree angled backing plate and short biteblock.

Question 8

Is the bisecting technique applied when the image receptor cannot be placed parallel to the long axes of the teeth?

Answer 8

TRUE

Question 9

Is the image receptor placed parallel to the long axes of the teeth when using the bisecting technique?

Answer 9

FALSE

Question 10

Do specific vertical angulations required when using the bisecting technique differ from those used with the paralleling technique?

Answer 10

TRUE

Question 11

Are changes in vertical angulation indicated when the patient’s palatal vault is high or low?

Answer 11

TRUE

Question 12

Does excessive vertical angulation when using the bisecting technique elongate the image?

Answer 12

FALSE

Question 13

Is the bisecting technique less likely to produce superior diagnostic-quality radiographs?

Answer 13

TRUE

Question 14

Can careful attention to the steps of the bisecting technique produce acceptable radiographs?

Answer 14

TRUE

Question 15

What two planes can be visualized by the radiographer?

Answer 15

The estimated long axis of the tooth and the plane of the image receptor.

Question 16

Does an isometric triangle have sides that are inversely related to the base?

Answer 16

FALSE

Question 17

Is a longer PID better suited to the bisecting technique?

Answer 17

FALSE

Question 18

Will a shorter target-image receptor distance increase magnification and distortion when using the bisecting technique?

Answer 18

FALSE

Question 19

Can the image receptor be placed close to the mandibular molars and still achieve a parallel relationship?

Answer 19

TRUE

Question 20

Can the image receptor be placed close to the maxillary anterior teeth and still achieve a parallel relationship?

Answer 20

FALSE

Question 21

Will the bisecting technique produce some dimension distortion even when positioning and angulation steps are accurate?

Answer 21

TRUE

Question 22

Should the patient bite down on the image receptor biteblock as close to the teeth as necessary when using the bisecting technique?

Answer 22

TRUE

Question 23

Must the patient be seated correctly to use predetermined vertical angulations when employing the bisecting technique?

Answer 23

TRUE

Question 24

Is the horizontal angulation determined in the same manner for both the bisecting and the paralleling techniques?

Answer 24

TRUE

Question 25

Is the seating position of the patient important in using predetermined anatomical landmarks?

Answer 25

FALSE

Question 26

Is the goal of accurate bisecting technique 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?

Answer 26

FALSE

Question 27

To avoid conecut error when using the bisecting technique, where should the point of entry be?

Answer 27

The image receptor must be centered within the beam of x-radiation.

Question 28

How should the patient be positioned to determine accurate and correct angles and points of entry?

Answer 28

The occlusal plane should be parallel to the floor and the midsagittal plane perpendicular to the floor.

Question 29

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?

Answer 29

The central ray of the x-ray beam should be directed at an imaginary bisector between the long axes of the teeth and the plane of the image receptor.

Question 30

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

Answer 30

The radiographer who possesses knowledge of both techniques is better able to produce diagnostic-quality radiographs under various conditions.

Question 31

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

Answer 31

The patient's occlusal and midsagittal planes must be correctly positioned.

Question 32

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

Answer 32

The bite extension of the stabe holder.

Question 33

What error results from excessive vertical angulation when taking periapical radiographs using the bisecting technique?

Answer 33

Excessive vertical angulation results in foreshortening of the image.

Question 34

What error results from inadequate vertical angulation when taking periapical radiographs using the bisecting technique?

Answer 34

Inadequate vertical angulation results in elongation of the image.

Question 35

Which technique for obtaining intraoral radiographs may be easier to use for children or adults with shallow palates?

Answer 35

The bisecting technique.

Question 36

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

Answer 36

The shorter (8 inch [20.5 cm]) PID.

Question 37

How does the bisecting technique relate to the rule of isometry?

Answer 37

Theoretically, two isometric triangles are formed when the central ray is directed perpendicular to the bisector.