Card Set Information

2010-12-15 16:18:05
Final Review week two

Ch. ten, sixteen, seventeen, and twenty
Show Answers:

  1. Test checking the calibration of the mA and kVp settings are most likely testing the accuracy of the what?
    dental x-ray machine
  2. A film-screen contact test that produces a film that exhibits a wire mesh image with a uniform density is interpreted as:
    adequate contact
  3. What does it mean if the image of a coin appears on the film after the coin test?
    the safe lighting is improper
  4. What indicates that the automatic processor is functioning properly when running a test film through?
    unexposed film is clear and dry; exposed film is black and dry
  5. A reference radiograph is one that is processed under ideal conditions and then used to compare the film densities that are processed daily. If the densities seen on the daily radiograph appear lighter than those seen on the reference radiograph, the developer solution is either week or cold
    both statements are true
  6. When the fixer is at full strength, a film should clear within ______ minutes
  7. Type of film used to examine the tooth (crown and root) and supporting bone
  8. The CMRS or FMX can be defined as a series of intraoral dental radiographs that shows all of the dentulous and edentulous areas of the upper and lower jaws. tooth-bearing areas are the regions of the maxilla and mandible where the 32 teeth of the human dentition are normally located
    both statements are true
  9. How far past the root apices must you see on a PA film?
    2-3 mm
  10. In the paralleling technique, the film is placed _______ to the long axis of the tooth, and the central ray of the beam is directed __________ to the film
    • parallel
    • perpendicular
  11. In the bisecting technique, the film is placed along the ________ surface of the tooth, and the central ray of the x-ray beam is directed perpendicular to the __________
    • lingual
    • imaginary bisector
  12. If a pt has a shallow palate, what are 2 things you can do to halp get the film positioned in the right place?
    • use 2 cotton rolls
    • vertical angulation no more than 20
  13. If a pt has a mandibular tori, the film must be placed between what?
    the tori and the tongue (not on the tori)
  14. To make sure you see the whole apex of the tooth in a PA, make sure that no more than ______ of the film extends beyond the occlusal surface
    1/8 inch
  15. What happens that will cause overlapping contacts?
    incorrect horizontal angulation
  16. If the vertical angulation is too excessive ________ will result. If the vertical angulation is insufficient _________ will result
    • foreshortening
    • elongation
  17. If the film is placed in the mouth backwards, how will the resultant film appear?
    light images with a herringbone pattern
  18. If the PID is not properly aligned with the film holder, and the x-ray beam does not expose the entire film, what will result?
    cone cut
  19. the appearance of a double image on the screen will result frojm what exposure/technique error?
    double exposure
  20. What is an advantage of the paralleling technique verses the bisecting technique?
    decreased distortion