Relating Histology of Enamel and Dentin to Caries

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Author:
nhi
ID:
63839
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Relating Histology of Enamel and Dentin to Caries
Updated:
2011-02-03 04:00:03
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Relating Histology Enamel Dentin Caries
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Relating Histology of Enamel and Dentin to Caries
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  1. what are the percentages of mineral, organic, and water in enamel?
    • mineral = 92%
    • organic = 2 %
    • water = 6%
  2. What is the anatomy of enamel?
    • rods are perpendicular to the enamel surface
    • crystals w/in the cyliners of tord enamel run parallel to the long axis of the rods
  3. what is the % of mineral, organic, and water in dentin?
    • mineral = 45%
    • organic = 33%
    • water = 22%
  4. Distinguish these 2.

    • top = deep dentin with large tubules that are spaced closer together
    • bottom = superficial dentin with small tubules spaced distance apart
  5. what are the zones of incipient enamel caries?
    • triangular shaped with the following -
    • surface zone = 1% demineralized
    • body of the lesion = 2-4% demineralized
    • dark zone
    • translucent zone = more crystals are being built to build defense
  6. caries in the enamel and dentine before ______ of the enamel.
    cavitation
  7. For approximal caries in enamel and dentine, what are the shapes?
    • v shape in enemal, base at the surface
    • v shape in dentin, base at the DEJ
  8. what are the zones for caries in enamel and dentin after caviation?
    • body: destruction, penetration and demin
    • translucent zone
    • normal
  9. explain this picture.
    • outer lesion = bacteria
    • inner lession = crystals that send acid in front
    • turbid = empty
    • transparent = where tooth build more mineral
  10. describe the shape of caries in developmental pits and fissures.
    • v shape in ename, base at the dej
    • v shape in dentin, base at the dej
  11. carious lesion at the root surface...
    • no enemel protection
    • proximity to pulp, U shaped

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