DH 1050 Final quizzes that I copied for 2014

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anatomy2012
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DH 1050 Final quizzes that I copied for 2014
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2014-12-03 22:19:32
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DH 1050 Final 2014
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DH 1050 the last quizzes I copied to study for the final
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  1. State and federal law require dental x-ray machines operating above 70 kVp have a minimum total/inherent plus added filtration of _____ mm of aluminum filtration
    2.5
  2. The guide lines for prescribing dental radiographs state that?
    a recall patient with clinical caries or at risk should have a posterior bite wing exam at 6 to 18 months intervals

    recommendations subject to clinical judgement
  3. According to current recommendations of the national counsel on radiation protection and measurement the current MPD for occupationally exposed persons is
    5.0 rems
  4. The current MPD for an occupationally exposed pregnant women is the same as for
    a nonoccupationally exposed person
  5. ALARA stand for
    as low as reasonably achieveable
  6. Dental radiographs detect ___, ____, ____ of teeth and bones that cant be detected clinically
    diseases, lesions, conditions of ?
  7. Avoid stimulating the gag reflex?
    demonstrate film placement

    don't drag it, don't place slow, don't wait 30 sec
  8. If you can't get intraoral films then you should get _____
    extraoral films
  9. how do you reduce gag reflex?
    ask patient suspend arm or leg in air
  10. developmental disability is s substantial impairment before age ___
    22
  11. Endentulous patient film placement
    one third extend beyond endentulous ridge
  12. unless protected by shield how many feet away at a right angle from beam should practitionaer stand
    6
  13. For radiation MPD stand for
    maximum permissable dose
  14. panormaic films are used for mostly
    impacted teeth
  15. pano radiography movement of film and tubehead produces an image through ____
    tomography
  16. in pano radiation the ___ is theoretical concept used to determine where teh dental arch must be positioned for the clearest image
    focal trough
  17. the collimator used in pano has an opening in teh shape of _____ slit
    narrow vertical
  18. the vertical angulation of the pano tubehead is ____ so that xray beam directed slightly upwards
    fixed
  19. the tubehead in pano radiography rotates ___ patient head as film rotates ___ of patient
    behind, in front
  20. In pano photography which exposure factor cannot change
    exposure time
  21. what is a ghost image
    all metallic or radiodense objects are not removed before exposure
  22. a reverse smile line is seen on a pano when __
    chin tipped up
  23. in pano rad. anterior teeth appear skinny when:
    teeth positioned for far back on bite block
  24. The disadvantage of pano rad is:
    the intensifying screens make the image not as sharp
  25. in what specialized area of dentistry are extraoral films used mostly
    oral surgery
  26. the fastest recommended screen and screen film is
    rare earth with green light
  27. a ____ is used to reduce amount of scatter radiation that reaches extraoral film during exposure
    grid
  28. which projection best used for impacted 3rd molars
    ramus of mandible
  29. purpose of transcranial projection is to evaluate articular eminence and ____ surface of condyle
    superior
  30. which projection is the best for maxillary sinus
    waters projection
  31. radiographic intensifying screens are used to
    reduce exposure time
  32. what specific mechanism of radiation injury may result in the formation of hydrogen peroxide when xray energy is absorbed by patient tissues;
    free radical formation created by ionization of water
  33. what mechanism of radiation injury may occur when xray energy absorbed by patient tissue
    ionization, free radical formation
  34. which two of the following statements regarding direct theory of radiation injury
    • it involves a direct hit
    • absorption of an xray photon within the cell
  35. the indirect theory proposes:
    free radicals combine to form toxins
  36. stochastic biologic effects from radiation
    occur as a direct function of dose
  37. nonstochastic effects include:
    erythema, loss of hair
  38. cellular injuries following latent period may include:
    cell death, cessation of mitotic activity, abnormal mitotic activity
  39. More radiation damage with high dose rates why; because rapid delivery of radiation does not allow time for cellular damage to be repaired

    true
     false
    true
  40. a short term effect of radiation exposure is:
    hair loss
  41. what is true of somatic effects of irradiation:
    changes not transmitted to future generations
  42. which cells are the most radiosensitive:
    blood
  43. what one is a radioresistant tissue:
    salivary glands
  44. critical organs exposed during dental radiographic procedures in head and neck include:
    skin, thyroid gland, lens of the eye, bone marrow
  45. risk estimates suggest (1) death more likely to occur with common activities than dental radiographic procedures (2) cancer more likely to be unrelated to radiation exposure

    true
    false
    both true
  46. use of F speed film instead of D speed film reduces absorbed dose by ___%
    60
  47. which of the following modifications in technology will reduce patient exposure to radiation during dental radiographic procedures:

    use D speed than F speed
    round rather than rectangular collimator
    longer source to film distance
    low kilovoltage peak
    longer source to film distance
  48. what combination results in lowest absorped dose for the patient from a 20 film series dental radiographs:
    rectangular collimator - F speed film

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