Radiology

Description:	2-Jolene
Category:	Radiology
Created by:	Sandys on 2009-04-30

Question	Answer
1. A thin black line is evident between the proximal contact area of adjacent teeth on a film. What is the most likely cause?	open contact because of the correct horizontal angle
2. What does the acronym, XCP, mean?	X C P = eXtension Cone Paralleling
3. What is meant by the acronym, DXTTR?	Dental X-ray Teaching Training Replica
4. What is the term for an image that appears shorter on the film than it actually is?	foreshortening
5. What is meant by the acronym, SFD?	Source (of x-rays) to Film Distance
6. What is the easiest method (and most common) for changing the SFD?	change the PID
7. What type of occlusal radiograph is best for viewing the apical areas of teeth?	topographical
8. What type of occlusal radiograph is best for viewing size and shape of arch?	cross-sectional
9. What is meant by obturating material?	filling for root canals
10. What is the most likely cause for a patient being unable to lift his or her tongue?	ankyloglossia (tongue tied)
11. Is it acceptable practice to use a tongue depressor as a film holding device?	yes
12. Is it acceptable practice to have the patient position and stabilize the film with his or her fingers?	no
13. What is the correct film position for parallel technique?	parallel to long axis of tooth
14. What is the correct direction of the x-ray beam for parallel technique?	perpendicular to film and long axis of tooth
15. Which intraoral exposures are made with the parallel technique?	periapicals
16. Which intraoral exposures are made with the bisecting technique?	periapicals
17. What is the correct film position for bisecting technique?	close to crown of tooth - forms and angle with the long axis
18. What is the correct direction of the x-ray beam for bisecting technique?	perpendicular to bisector
19. Which periapical technique will result in a radiograph of the highest diagnostic quality?	parallel
20. Which periapical technique will accommodate a mouth with a very flat palate?	bisecting angle
21. If the patient has a shallow floor of the mouth, describe the exposure method that is appropriate.	bisecting; flatter film postition; increase vertical anlge
22. What are the benefits of dental radiographs?	diagnose conditions in early stages to save time, money and pain
23. For which exposure technique is the XCP designed?	parallel
24. Which exposures could be accomplished with the Snap-a-Ray?	bisecting-angle and parallel; also pedo bitewings
25. Describe the use of salt for controlling gagging.	place on tongue prior to exposure
26. The dental assistant is exposing a FMS and decides to use topical anesthetic to control gagging. What is the very first thing that should be done?	ask dentist to confirm use
27. What amount of time does it take for the topical anesthetic to take effect?	two minutes
28. Is it appropriate to use a loop tab for exposing a vertical bitewing?	no
29. Is it appropriate to use a Snap-a-ray for exposing a vertical bitewing?	no
30. What is the area of focus for an endodontic exposure?	apex
31. Which films are typical of a FMS for a five-year-old patient?	2 bitewings; 2 occlusals (1 upper, 1 lower, focusing on the anterior teeth
32. Which information must be included on a film mount?	patient name, date of exposure, possibly the prescribing dentist
33. What is the purpose for edge-eeze?	comfort to patient - covers sharp edges of film packets
34. Which exposure technique is appropriate for edentulous patients?	parallel - pad the bite blocks with cotton rolls
35. Which size film is appropriate for a three-year-old for exposing bitewings?	size 0
36. What adjustment in exposure time is required for a small child?	reduce by approximately 50%
37. What adjustment in exposure time is required for edentulous patients?	reduce by approximately 25%
38. What film holding instrument is specifically designed for exposing endodontic films?	endoray
39. What is the direction of the embossed dot for buccal view mounting of radiographs?	convexity towards viewer - bump facing viewer