Rad Test VI

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Rad Test VI
2012-11-10 20:01:11
Rad Test VI

Rad Test VI
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  1. What is vertical angulation for maxillary topographical occlusal film?
    • + 60 - 65
    • Pt. upright
    • insert film with longest demension vertically
  2. What is vertical angulation for cross-sectional occlusal film?
    • + 75
    • Pt. upright
    • insert horizontally
  3. What is vertical angulation for mandibular topographical occlusal film?
    • - 55
    • Pt. head tilted back
    • vertically
  4. What is vertical angulation for mandibular cross-sectional occlusal film?
    • 90
    • Pt. supine
    • horizontally
  5. What is occlusal film for an adult?
  6. Which occlusal film is used like a periapical?
  7. Which occlusal film is used to locate a structure buccally or lingually?
  8. What type of safelight can be used with the pan film?
    either dark or red
  9. What is lateral jaw film used for?
    posterior region of the mandible (areas too large to show up on PA)
  10. What is the Water's view used for?
    view maxillary sinus
  11. What is TMJ film used for?
    to examine TMJ
  12. What is cephalometric film used for?
    to evaluate facial growth & development
  13. What film shows the skull as if u were looking directly at the patient?
  14. Which film requires a fixed head position?
  15. Which survey requires 2 films, 1 with the mouth open & 1 with mouth closed?
  16. Intesifying screens are used to:
    intiensify radiation thus decreasing exposure time
  17. Using Clark's rule if the object moves int he same direction as the tube shifts then its located? if it moves in opposite direction?
    • same-lingual
    • opposite-buccal
  18. What is the main advatage of using pan film? disadvantage?
    • advantage- decrease in exposure time, easy, can see entire dentition & TMJ, good for pt. education
    • disadvantage- lack of detail, overlapping anteriors, ghost images superimposed over structures
  19. Know which films are intraoral & extraoral...
    • intraoral-(non-screen/direct/xrays) pa, bitewings, occlusal(#4)
    • extraoral-(screen/indirect/light) pan
  20. The panoramic film is based on the principle of?
  21. Define focal trough..
    zone of sharpness (bite tab)
  22. What needs to be removed bedore taking a pan?
    any metal & removable appliances
  23. What solutions can pans be processed in?
    regular solutions
  24. What screen emits blue light?
    calcium tungstate crystals
  25. What screen emits a green light?
    rare earth (Lanex) crystals
  26. What screen uses less radiation exposure?
    intensifying---rare earth(Lanex)crystals/green
  27. What do u need to remember when matching intensifying screens to film?
    match screen w/ film that is sensitive to the light they omit
  28. What would u need to do if the patient was edentulous to keep arches seperate?
    use cotton roll
  29. What is pan film..direct or indirect?
  30. Define direct exposure film & indirect exposure film?
    • direct exposure film-intraoral films, xrays produce image(occlusals, pa, bws)
    • indirect exposure film-extraoral film, radiation hits screens & causes it to fluorescence & emit light which exposes the film(pan)
  31. Define secondary radiation..
    radiation formed by the interaction of xrays & matter
  32. Pan error-chin tipped up too much? down too much?
    • chin up-frown appearance & apices of max. teeth cut out
    • chin down-exaggerated smile
  33. Pan error- head position too far forward(closer to film)? head position too far behind(farther from film)
    • head too far forward(closer to film)-anterior teeth blurred & narrow
    • head too far behind(farther from film)-anterior teeth blurred & magnifyed
  34. Pan error-head rotated?
    one side is small other is magnifyed
  35. Pan error-patient slouched?
    ghost image of spine superimposed over chin(anterior white out)
  36. Pan error-failure to remove metallic items?
    leaves ghost image on opposite side(usually larger & higher)
  37. Pan error-lead apron appearance?
    clear area(no teeth seen thru)
  38. Pan error-tongue not pressed to palate?
    radiolucent image over maxillary apices
  39. Do u use a thyroid collar for pan?
  40. Definition & significance for ionizing radiation?
    when atom gains or loses an electron; proces by which ionizing radiation causes biological damage
  41. Distance you should be from source of radiation?
    6ft. away & 90-136 degrees to the side of the beam
  42. Know which cells are radioresistant & radiosensitive?
    • most(sensitive)>least
    • Respiratory>Lymphatic>Circulatory>Endocrine> Respiratory>Digestive>Nervous
    • (Real love constitutes entire respect, dont namecall)
  43. Thermonic emission
    boiling off of electrons into a cloud @ filament wire
  44. Source of xrays? source of electrons?
    • xrays-target(anode)focal spot
    • electrons-filament wire
  45. Collimator? filter?
    • collimator-protective device, restricts size of beam to 2.75in(so volume of tissue exposed),made of lead
    • filter-protective devive from unecessary radiation by filtering out weak, less penetrating xrays from beam that would otherwise be absorbed by patients face, made of aluminum
  46. Know which structures are radiolucent & radiopague?
    • radiolucent-(blacker)canal, foramen, fossa, meatus, sinus, space(pdl), suture
    • radiopague-(whiter)bone, border(wall), process, ridge, spine, tubercles, tuberosity