Chapter 18 DR
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
ANS: A
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
ANS: B
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
ANS: B
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. ½
ANS: B
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
ANS: B
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
ANS: B
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
ANS: A
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.
ANS: A
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.
ANS: A
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.
ANS: A
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
ANS: A
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
ANS: A
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
ANS: A
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
ANS: B
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
ANS: B
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.
ANS: B
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.
ANS: B
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
ANS: B
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.
ANS: B
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.
ANS: B
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
ANS: B
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
ANS: C
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.
ANS: C
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
ANS: C
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.
ANS: C
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
ANS: C
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.
ANS: C
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.
ANS: C
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.
ANS: C
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
ANS: D
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
ANS: D
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
ANS: D
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.
ANS: D
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.
ANS: D
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.
ANS: D
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
ANS: D