ch. 20 exam 3 exposure and technique errors

Card Set Information

ch. 20 exam 3 exposure and technique errors
2010-10-27 10:39:11

exposure and technique errors
Show Answers:

  1. radiographs are taken to benefit who?
    the patient
  2. a diagnostic dental radiograph is one that has been properly...(3)
    placed, exposed, adn processed
  3. exposure problems (4)
    • not exposed,
    • accidentally exposed to light,
    • overexposed,
    • underexposed
  4. Appearance, Cause, and correction of unexposed film
    • Appearance: clear
    • Cause: film not exposed due to electrical failure, malfunciton of x-ray machine, or x-ray machine not turned on
    • Correction: make sure x-ray machine is on, listen for audible exposure signal
  5. Appearance, Cause and Correction for film exposed to light
    • Appearance: black
    • Cause: accidentally exposed to white light
    • Correction: do not unwrap in a room with white light. check the darkroom for light leaks.
  6. Appearance, cause and correction for overexposed film
    • Appearance: dark
    • Cause: excessive exposure time, kilovoltage, or miliamperage, or a combination of factors
    • correction: check exposre time, kvp, and mA settings before exposeing the film
  7. Appearance, cause, and correction for underexposed film
    • Appearance: light
    • cause: inadequate exposure time, kvp, or mA or a combination of these factors
    • correction: check exposure time, kvp, adn mA settings before exposing film
  8. Periapical technique errors (3)
    • film placement
    • angulation
    • beam alignment problems
  9. how must the edge of periapical film be placed?
    parallel to the incisal or occlusal surfaces of the teeth and extend 1/8 inch beyond the inciasal or occlusal surfaces
  10. incorrect film placement may result from (3)
    • improper placemtne of film over area of intended interest
    • inadequate coverage of apical regions
    • dropped film corner
  11. angulation problems
    Vertical and horizontal
  12. PID alignment problems
    • cone cut with film holder
    • cone cut without film holder
  13. Technique errors with bite-wing film
    • film placement
    • angulation
    • beam alignment problems
  14. Bite-wing film should show?
    • Max and man. teeth
    • interproximal contact areas
    • crestal bone
  15. Where should bite-wing film be placed?
    • placed over the prescribed areas
    • must show occlusal plane that is postioned horizontally along the long axis of the tooth
  16. Where is film placed for premolar bite-wings?
    front edge of the film should be aligned with the midline of the mandibular canine
  17. where is film placed for molar bite-wings?
    postitoned so that the front edge of the film is aligned with the midline of the mandibular second premolar
  18. Incorrect bite-wing film placement may result in (4)
    • an absence of specific teeth or tooth surfaces on a film
    • a tipped occlusal plane
    • overlapped interproximal contacts
    • a distorted image
  19. Miscellaneous technique errors (6)
    • film bending
    • film creasing
    • phalangioma
    • double exposure
    • patient movement
    • reversed film
  20. images appear stretched and distorted from this error
    film bending
  21. a thin radiolucent line appears from this error
    film creasing
  22. The patient's finger appears on the film in this error
  23. a double image appears on the film from this error
    double exposure
  24. blurred images appear on the film from this error
  25. light images with a herringbone pattern appear on the film from this error
    reversed film