hews 200

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hews 200
2013-08-20 12:47:12
hews 200

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  1. Caries dyes: fusayama differentites
    two layers of carious dentin
  2. outer layer dentin
    • highly-decalcified
    • fuschin-stainable
    • irreversible denaturation of collagen
    • UN recalcifiable
  3. inner layer dentin
    • partially decalcified
    • fuschin-unstainable
    • sound collagen fibers
    • RECalcifiable
  4. Where is infected and affected dentin?
    affected is the inner layer with intratubular dentin barrier behind it.

    "infected" large numbers bacteria
  5. Because of carcinogenic, fuschin dye was replaced by acid red solution.

    Acid RED is
    1% acid red in polypropylene glycol
  6. Acid red stains infected dentin which
    enhances complete removal of infected dentin and More accurate diagnosis

    Prevent over removal
  7. Traditional detection methods have
    low specificity (high false P)
  8. CARIES DYES should reduce
    unnecessary removal of sound dentin/ ensure removal of affected dentin
  9. What do CDDs stain?
    organic matrix/collagen of less mineralized dentin NOT BACTERIA
  10. Evidence says that CDDs
    have low specificity, also high false P
  11. What are common sites of false Ps?
    • dentin at DEJ
    • Dentin at pulp

    B/c higher percentage of organic matrix here
  12. Intense CDD staining means
    severely disease dentin
  13. CDDs on enamel
    NO. They are non-specific protein dyes.
  14. In addition to teeth CDDs can also stain...
    food, pellicle, organic stuff
  15. Fiber optic transillumination is designed for?
    Early detection of caries lesions
  16. FOTI use what principle to distingusih b/t normal and carious enamel?
    The principle of light scattering
  17. What tissue has more scattering and absorption of light?
    Demineralized tissue
  18. What tissue has more transmission?
    Sound tissue
  19. T/F FOTI cannot tell b/t enamel and dentin lesions even though it is in 3D.
  20. Enamel lesion vs dentin lesion color:
    gray shadow vs orange-brown bluish shadow
  21. How is FOTI different from radiographs
    Uses only high intensity white light, not ionizing radiation
  22. FOTI performance on proximal lesions compared to BWs
    • High specificity
    • Lower sensitivity

    But not statisically different
  23. T/F Over all FOTI is better than visual exam alone.
  24. How is FOTI on occusal lesions?
    • Technique sensitive
    • Lower performance in presence of stain
  25. FOTI plus CCD intraoral camera has image relay mirror. 

    If DIFOTI transilluminated the facial side...the image is on the
    Lingual side
  26. What captures the incipient caries inside the mouth?
    Image receiving mirror received the light from the FO light source
  27. How can xrays miss a spot that is captured by FOTI?
    • tooth too thick to capture caries on other side via xray. 
    • FOTI light source from facial side captures caries on the lingual side.
  28. DIFOTI in vivo studies
    • Minimally available. 
    • In vitro high sensitivity for Proximal lesions for EARLY caries
  29. T/F DIFOTI with xrays improves accuracy.
  30. Why do DIFOTI not replace xrays?
    DIFOTI cannot be used for depth determination.
  31. What is a physical limitiation fo FOTI?
    amount of light that can be amplified
  32. FOTI excellent for
    • suspicious fissures and cracks
    • confirming cracks