Radiography chapter 30 21 22 28

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Radiography chapter 30 21 22 28
2015-11-12 09:07:02

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  1. a panoramic radiograph is valuable when diagnosing each of the following except one
    recurrent caries
  2. which of these is an advantage of a panoramic radiograph when compared to an intraoral radiograph
    superimposition of structures may make interpretation difficult
  3. what is the term given to the technique where a slice of tissue is exposed distinctly, whereas structures outside the designated area are blurred out of the image
  4. all panoramic radiographs have 10 to 30 percent magnification
    it is desirable to keep the magnification less in the anterior region and greater in the posterior region
    the first statement is true. the second statement is false
  5. the panoramic PID is collimated to what shape
    narrow slit
  6. what term is given to the area where structures will be imaged with relative clarity, whereas structures outside this area are blurred out of the image
    focal trough
  7. each of the following is a component of the panoramic x-ray machine EXCEPT one
    variable exposure timer
  8. which dimension of the focal trough does the biteblock of the panoramic x-ray machine assist the operator with positioning
  9. which of the following planes is used to position the patient correctly within the superior-inferior dimension
    both ala-tragus line and Frankfort plane
  10. which of the following positioning errors results in anterior teeth that are blurry and narrowed in size
    too far forward in the focal trough
  11. when the dental arches are rotated to the left, the teeth on the right side will be positioned closer to the image recepetor
    the teeth closer to the image receptor will appear blurry and magnified
    both statements are false
  12. which of the following positioning errors results in an exaggerated smile appearance of the arches
    chin tipped too far down
  13. the appearance of a large radiolucency that obscures the max teeth apices results when..
    the tongue is not resting on the palate during exposure
  14. which of the following appears radiolucent on a panoramic radiograph
    nasal cavity
  15. which of the follwing appears radiopaque on the panoramic
    zygomatic process of the maxilla
  16. which of the following could be called a negative shadow
    glossopharyngeal air space
  17. what is the term given to a structure that is recorded a second time with less sharpness and on the opposite side
    ghost image
  18. to avoid molar overlap the radiographer should place the image receptor
    perpendicular to the molar embrasures
  19. to minimize canine premolar overlap the radiographer should direct the xray beam toward the image receptor slightly obliquely from the...
  20. to compensate for a shallow palatal vault the vertical angulation may be adjusted to
    increase by up to 15 degrees
  21. which area of the oral cavity requires the highest exposure setting
    maxillary posterior region
  22. the presence of a large mandibular torus may make which of these difficult
    placing the image receptor precisely
  23. the best image receptor placement for a patient with a torus palatinus is
    behind the torus
  24. the paralleling technique is the best technique for imaging the edentulous areas
    the bisecting technique is the best technique when imaging the endodontic treatment
    • first statement is true
    • second statement is false
  25. which of the following radiographs wold be the least beneficial for the totally edentulous
  26. the exposure setting for edentulous regions shouls be decreased from the exposure time for the same region with teeth by
    one fifth
  27. which of the following would be the best image receptor holder for exposing working radiographs during a root canal procedure
    commercially made endodontic holder
  28. localization adds which of the following dimensions to two-dimensional radiographs
  29. which of the following mehtods of localization utilizes a cross sectional occlusal radiograph
    right-angle method
  30. if the tube shifts to the mesial and the object in question shifts to the distal the object is located on the lingual
    this is an example of the definitive method of localization
    both are false
  31. when exposing a disto-oblique periapical radiograph of the maxilla, which of the following changes should be made to the standard periapical radiograph
    all of the above
  32. to prject an imacted mandibular third molar anteriorly onot the image receptor, a mandibular disto-oblique paricapical radiograph requires a
    10 degree shift in the horizontal angulation
  33. a competent dental hygienist and dental assistant must be able to identify which of the following radiographically
    normal anatomy
  34. which of the following facial bones would most likely appear on a periapical radiograph
  35. bone sometimes has a mixed radiopaque-radiolucent appearance due to the nature of the
    trabeculae patterns
  36. whicn of the following will most likey appear as a radiopacity outlining the tooth root
    lamina dura
  37. when nutrient canals open at the surface of the bone, the often appear radiographically as
    small radiolucent dots
  38. which of these structures appears radiolucent
  39. a periaplical radiograph of a 10 year old will most likely reveal developin gpermanent dentition
    evidence of a congenitally missing permanent tooth is clled impaction
    • the first is true
    • the second is false
  40. on a PA radiograph of the max molars, which of the following structures may be recorded superimposed over the roots of the teeth
    zygomatic process
  41. each of these features will appear radiolucent except
  42. each of these features will appear radiopaque except
  43. which of the following is the best reccomended sequence for identifing normal radiographic anatomy
    • 1. determin if max or mand
    • 2. determine of anterior or posterior
    • 3. determine if structure is paque or lucent
  44. each of the following may appear on a PA radiograph of the max anterior region except
    maxillary tuberosity
  45. each of the following may appear on a PA radiograph of the max post except
  46. a mand landmark feature that may be imaged on a PA radiograph of the max posterior region is the
    submanibular fossa
  47. each of the following may appear on a PA radiograph of the mand posterior except
    pterygoid plate
  48. the inverted Y landmark is composed of the intersection of which two structures
    lateral wall of the nasal cavity and anterior border of the max sinus
  49. a desirable film mount should be
    black, to block out light transmission and prevent glare
  50. which of these helps determine whether the radiograph is the patients left or right side
    indetification dot
  51. labial method film mounting positions the identification dot concave
    the labial method is the recommended film mounting method
    the first statement is false. the second is true
  52. lingual method film mounting positions the identification dot convex
    when utilizing the lingual method the viewers right is the patients left
    both are false
  53. mounting is the placement of the radiographs in a holder arranged in anatomical order
    all radiographs should be handled with care to prevent smudging or scrathing
    both are true
  54. which of the following should be done first when mounting radiographs
    orient the identificiation dot the same way
  55. each of the following will aid the radiographer in correctly mounting radiographs except one
    roots and crowns of mand teeth are usually larger than max teeth
  56. reading and explaining radiographs is
  57. the final responsibilty to diagnose the radiograph rests with the
  58. viewing radiogrpahs in a sustematic sequence can help prevent errors in interpretation
    moutned radiographs may be thoroughly viewed by holding the mount up to overhead room lighting
    the first statement is true. the second is false
  59. which of thes is not a consideration when viewing digital radiographic images
    a magnifying glass will be required for optimal viewing and interpretation
  60. in which region is it best to begin the interpretation process when viewing radiographs mounted using the labial method
    max right posterior
  61. following diagnosis by the dentist, the radiographic findings must be recorded on the patients record by the
    • any of the above
    • hygienist
    • assistant
    • dentist