Chapter 18: Bisecting Technique
Iannucci: Dental Radiography, 5th Edition
MULTIPLE CHOICE
1. The rule of isometry states that two triangles are equal if they have ______ equal angle(s) and
share a common side.
a.
one
b.
two
c.
three
d.
four
2. When the bisecting technique is used, the receptor must be placed along the ________ surface
of the tooth.
a.
buccal
b.
lingual
c.
mesial
d.
distal
3. When the bisecting technique is used, which of the following angles is bisected?
a.
The angle formed by the receptor and the long axis of the tooth
b.
The angle formed by the central ray and the tooth
c.
The angle formed by the central ray and the receptor
d.
The angle that is perpendicular to the receptor
4. When the bisecting technique is used, the central ray is directed at 90 degrees to the
a.
receptor.
b.
long axis of the tooth in the same arch.
c.
long axis of the tooth in the opposing arch.
d.
imaginary bisector.
5. (1) When using the bisecting technique, the receptor holder or the patient’s finger may be
used to stabilize the receptor. (2) A beam alignment device is used to stabilize the receptor
and to align the position-indicating device (PID).
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.
6. The primary benefit of using a collimator on a Rinn BAI instrument with the bisecting
technique is
a.
assisting in determining vertical angulation.
b.
helping to minimize cone cuts.
c.
reducing the patient’s exposure to radiation.
d.
allowing the operator to have the receptor parallel to the long axis of the tooth.
7. You are using the Rinn Snap-A-Ray to take a dental image of tooth #13. What vertical
angulation should you set the PID at to get a dental image that is the same length as the tooth?
a.
–10 to –15 degrees
b.
+ 20 to +30 degrees
c.
+30 to +40 degrees
d.
There is no need to set the vertical angulation.
8. When Rinn BAI instruments are used, “BAI” refers to which of the following?
a.
Bisecting aiming instrument
b.
Bisecting angle instrument
c.
Bisecting angle integration
d.
Both angle integration
9. Which of the following commercially available receptor holders are recommended for use
with both the paralleling and the bisecting techniques?
1. Rinn XCP instruments
2. Rinn BAI instruments
3. Precision receptor holder
4. Stabe bite-block
5. Snap-A-Ray receptor holder
a.
1, 2, 3, 4, 5
b.
2, 3, 4, 5
c.
3, 4, 5
d.
2, 4, 5
10. Which of the following commercially available receptor holders is recommended for one-time
use only?
a.
Rinn XCP instruments
b.
Rinn BAI instruments
c.
Stabe bite-block
d.
Snap-A-Ray receptor holder
11. Which size receptor is traditionally used with the bisecting technique?
a.
#1 receptor for anterior teeth, #1 receptor for posterior teeth
b.
#1 receptor for anterior teeth, #2 receptor for posterior teeth
c.
#2 receptor for anterior teeth, #1 receptor for posterior teeth
d.
#2 receptor for anterior teeth and for posterior teeth
12. Which of the following techniques use the same principles of horizontal angulation?
1. Paralleling
2. Bisecting
3. Bite-wing
a.
1, 2, 3
b.
1, 2
c.
2, 3
d.
1, 3
13. With the bite-wing technique, the vertical angulation is predetermined; the central ray is
directed at ____ degrees to the occlusal plane.
a.
+10
b.
–10
c.
+20
d.
–20
14. With the ____________ technique, the vertical angulation is determined by the imaginary
bisector; the central ray is directed perpendicular to the imaginary bisector.
a.
paralleling
b.
bisecting
c.
bite-wing
d.
occlusal
15. Foreshortened images refer to images of the teeth that appear _________. Foreshortening of
images results from ___________ vertical angulation.
a.
shortened; insufficient
b.
shortened; excessive
c.
too long; insufficient
d.
too long; excessive
16. When the bisecting technique is used, foreshortening will occur if the central ray is directed
perpendicular to the
a.
plane of the receptor.
b.
imaginary bisector.
c.
long axis of the tooth on the same arch.
d.
long axis of the tooth on the opposite arch.
17. Elongated images refer to images of the teeth that appear __________. Elongation of images
results from _____________ vertical angulation.
a.
too long; excessive
b.
too long; insufficient
c.
shortened; excessive
d.
shortened; insufficient
18. Receptor should be placed approximately ____ inch beyond the incisal or occlusal surfaces
when using the bisecting technique.
a.
1/16
b.
1/8
c.
1/4
d.
1/2
19. According to the text, when exposing the anterior teeth using the bisecting technique, there
are ________ recommended size 2 periapical receptor placements.
a.
four
b.
six
c.
seven
d.
eight
20. The recommended anterior periapical exposure sequence for the bisecting technique starts
with the
a.
maxillary right canine.
b.
maxillary left canine.
c.
mandibular right canine.
d.
mandibular left canine.
21. The recommended posterior periapical exposure sequence for the bisecting technique is to
begin with the
a.
maxillary right quadrant.
b.
maxillary left quadrant.
c.
mandibular right quadrant.
d.
mandibular left quadrant.
22. According to the recommended posterior periapical exposure sequence for the bisecting
technique, the second posterior quadrant exposed should be the
a.
maxillary right quadrant.
b.
maxillary left quadrant.
c.
mandibular right quadrant.
d.
mandibular left quadrant.
23. According to the text, when exposing a complete mouth image series (CMS) using the
bisecting technique, there are ____ recommended size 2 periapical receptor placements.
a.
7
b.
12
c.
14
d.
19
24. According to the text, the advantages of the bisecting technique are greater than the
disadvantages. Therefore, the bisecting technique should be used instead of the paralleling
technique when taking periapical images.
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.
25. The primary disadvantage of the bisecting technique when contrasted with the paralleling
technique is
a.
longer exposure times.
b.
dimensional distortion.
c.
requirement of a receptor holder.
d.
greater magnification.
26. When adjusting the horizontal angulation, the PID is moved ___________. When adjusting
the vertical angulation, the PID is moved ______________.
a.
side-to-side; side-to-side
b.
side-to-side; up-and-down
c.
up-and-down; side-to-side
d.
up-and-down; up-and-down
27. For the maxillary premolar exposure, the mesial edge of the receptor should be aligned with
the midline of the maxillary
a.
lateral incisor.
b.
canine.
c.
first bicuspid.
d.
second bicuspid.
28. For the mandibular molar exposure, the mesial edge of the receptor should be aligned with the
midline of the
a.
canine.
b.
first premolar.
c.
second premolar.
d.
first molar.
29. With the bisecting technique, the recommended vertical angulation range for tooth number 6
is _________ degrees.
a.
+20 to +30
b.
+30 to +40
c.
+40 to +50
d.
+45 to +55
30. With the bisecting technique, the recommended vertical angulation range for tooth number 30
is _________ degrees.
a.
–5 to 0
b.
+ 20 to +30
c.
–20 to –30
d.
–10 to –15
31. The contacts on your dental image are overlapped, which of the following would you correct
when retaking the image?
a.
Horizontal angulation
b.
Vertical angulation
c.
Head position
d.
Receptor placement
32. The teeth on your dental images appear shorter than your patient’s teeth, which of the
following would you correct when retaking the dental image?
a.
Increase horizontal angulation
b.
Increase vertical angulation
c.
Decrease vertical angulation
d.
Decrease horizontal angulation
33. Your premolar image is undiagnostic, the mesial half of the dental image is radiopaque. You
are missing the canine and first premolar, and the distal edge of the radiopaque area is curved.
Which of the following will you adjust to correct this error for the retake?
a.
Receptor position
b.
Vertical angulation
c.
Horizontal angulation
d.
Receptor exposure
34. You are using the Rinn Snap-A-Ray to take a dental image of tooth number 13. What vertical
angulation should you set the PID at to get the proper image?
a.
–10 to –15 degrees
b.
+ 20 to +30 degrees
c.
+30 to +40 degrees
d.
There is no need to set the vertical angulation.
35. You are using the Rinn Stabe Bite-bloc to take a dental image of teeth numbers 23-26. What
vertical angulation should you set the PID at to get the proper image?
a.
–20 to –30 degrees
b.
–15 to –25 degrees
c.
+40 to +50 degrees
d.
There is no need to set the vertical angulation.
36. You are using the Rinn BAI System to take a dental image of tooth number 1. What vertical
angulation should you set the PID at to get the proper image?
a.
–5 to 0 degrees
b.
+20 to +30 degrees
c.
+30 to +40 degrees
d.
There is no need to set the vertical angulation.