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radiology quiz three

  1. define bisecting technique
    another method that can be used to expose periapical film
  2. what side must the film be placed in the bisecting technique?
    along the lingual surface of tooth
  3. the film and tooth form an_______________
    angle
  4. where must the central ray be directed towards the plane that the radiographer visualizes during the bisecting technique?
    at a 90* angle to it-perpendicular to it
  5. what type of x-ray holders are used for the bisecting technique?
    • rinn BAI instrument
    • stabel bite-block
    • EEZEE - grip film holder (snap-a-ray)
  6. what are the disadvantages of using the finger-holding method in the bisecting technique?
    • pt hand in way of primary beam
    • pt error-may move film on accident
    • possible cone cuts
  7. what is the finger-holding method?
    alternative to using a film holder in the bisecting techniquethe pt finger or thumb is used to stabalize the periapical film
  8. what is a trick technique in making sure the central ray is perpendicular with the imaginary bisector?
    place PID parallel to long axis, then slightly tilt
  9. What is the term angulation used to describe?
    the alignment of the central ray of the x-ray beam in the horizontal and verticle planes
  10. Horizontal angulation
    perpendicular to curvature of the arch and through the contact areas
  11. How will the film appear with correct horizontal angulation?
    contact areas will be open
  12. How will the film appear if the horizontal angulation was incorrect?
    contacts between teeth will appear overlapped
  13. vertical angulation
    refers to the positioning of the PID in a vertical or up or down plane
  14. how will a film appear when correct verticle angulation is used?
    radiographic image that is the same length as the real tooth
  15. how will a film appear when incorrect verticle angulation is used?
    • foreshortened images: occur from excessive verticle angulaton
    • elongated imagea: result from insufficient angulation, it is to flat
  16. what is the rule for film placement in the bisechting technique?
    film must conver the prescribed area of teeth to be examined
  17. what is the rule for film position in the bisecting technique?
    film must be placed against the lingual surface of the tooth, the occlusal end of the film must extend about 1/8 inch beyond the incisal or occlusal surafaces. The apical end of the film must rest against the palatal or alveolar tissues.
  18. what are the rules for vertical angulation in the bisecting technique?
    central ray must be perpendicular to the imaginary bisector
  19. what are the rules for horizontal angulation in the bisecting tecnhique?
    central ray must be directed through the contacts of the teeth
  20. what are the rules for film exposure for the bisecting technique?
    center the x-ray beam on film to ensure that all areas of the film are exposed
  21. explain the step-by-step procedure for pt preparation of bisecting technique.
    • explain procedure to pt
    • position chair
    • adjust headseat
    • place lead apro and thyroid collar
    • remove objects
  22. explain the step-by-step procedure for equipment preparation of the bisecting technique
    • set exposure factors (kVp, mA, and time)
    • open sterilized packages and assemble holders as needed
  23. what is the exposure sequence of the anterior teeth for the bisecting technique?
    begin with the maxillary right canine- expose all of the maxillary anterior teeth from right to left- end with the maxillary left canine- move to the mandibular left canine-expose all of the mandibular anterior teeth from left to right- finishing with the right mandibular canine
  24. What is the exposure sequence of the posterior teeth for the bisecting technique?
    • begin with the maxillary right quad
    • expose premolar, then molar film
    • move to the mandibular right quad
    • expose premolar than molar film
    • move to the left maxillary quad
    • expose premolar than molar film
    • finish with the mandibular left quad
    • expose premolar than molar film
  25. how many anterior films are taken in the bisecting technique?
    • 2 maxillary canine exposures
    • 1 maxillary incisor exposures
    • 2 mandibular canine exposures
    • 1 mandibular canine exposure
  26. how many posterior films are taken with the bisecting technique?
    • 2 maxillary premolar exposures
    • 2 maxillary molar exposures
    • 2 mandibular premolar exposures
    • 2 mandibular molar exposures
  27. what should you see in the canine films?
    first premolar, canine, and lateral incisor
  28. what should you see on the incisor films?
    • maxilla: 2 central incisors and mesial of lateral incisors
    • mandible: all 4 incisors
  29. what should you see on the premolar exposures?
    • centered on 2nd premolar
    • distal of canine
    • mesial of 2nd molar
  30. what should you see on the molar exposure?
    • centered on 2nd molar
    • very distal of 2nd premolar
    • all 3 molars
  31. what are the advantages of using the bisecting technique?
    • it can be used without film holding devises when anatomy of pt is difficult to work with
    • short PID and short exposer time
  32. what are the disadvantages of the bisecting technique?
    • image distortion
    • angulation problems
    • unnecessary exposure to pt hand
Author
sthomp88
ID
35038
Card Set
radiology quiz three
Description
bisect
Updated

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