Histology chapter 12.txt

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tigermom23
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19130
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Histology chapter 12.txt
Updated:
2010-05-12 23:56:47
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histo chapt
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histo chapt 12
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  1. Sheets of abnormally crystallized enamel-longer and mor narrow than enamel tufts
    Enamel lamellae
  2. Areas of abnormally crystlized enamel near the DEJ
    Enamel tufts
  3. Dentinal tubules within enamel -near DEJ
    Enamel spindles
  4. Prominent line of Retzius-indicated stress @ birth
    Neonatal line
  5. T/F: what is the reason we acid the enamel struture of a tooth
    To remove some of the organic material - roughen the surface for better retention
  6. The grooves between the imbrication lines - ridges themselves
    Perikymata
  7. Parallel buccal ridges near the CEJ of the upper anteriors. Usually rough
    Imbrication lines
  8. Cross striations on the enamel rods that correspond to growth rings - stain brown
    Lines of Retzius
  9. Type of fluoride that only works if taken internally and only works @ the pre-eruptive stage
    Systemic flioride
  10. Direct contact fluoride;only works on erupted teeth
    Topical fluoride
  11. Caused by excessive intake of fluoride-gives teeth a mottled appearance
    Fluorosis
  12. T/F: Systemic fluoride can help enamel that is already matured and hardened
    False: systemic flouride only works on pre erupted teeth
  13. Crystalline building block of enamel
    Enamel rod
  14. It takes____ameloblast to produce 1 enamel rod
    4
  15. The ratio of ameloblast to enamel rods
    4:1
  16. FYI:
    • Each enamel rod extends from the DEJ to the outer surface of the tooth
    • 2. Each rod is 90* to the DEJ and curves slightly toward the outer surface
    • 3. The key hole shape locks the roda together
  17. Scalloped border that is seem microscopically mature enamel
    • Dentoenamel junction
    • DEJ
  18. On the DEJ the ___side is toward the dentin and the ___side is toward the enamel
    • Convexed
    • Concaved
  19. Enamel matrix becomes heavily mineralized during this stage
    Matutation
  20. What happens to the ameloblast after apposition and mineralization occurs
    They become part of the reduced enamel epithelium
  21. 2 developmental disturbances that occur during the apposition stage
    • Enamel pearls
    • Enamel displasia
  22. Begins in pits and grooves of the tooth-always larger than it appears on xray-usually not visible until it reaches the DEJ
    Caries
  23. Hardest calcified tissue of the human body
    Enamel
  24. Composition of enamel
    • 96% calcium hydroxyapatite
    • (non organic)
    • 3% water
    • 1% organic material (cells)
  25. T/F: enamel is a vital tissue-it has blood supply and nerves
    False: enamel is non vital and it has no nerves or blood supply
  26. Can enamel regenerate or repair itself
    No it can not
  27. Mechanical wear on facial surface - tooth fractures from gumline...caused from hitting too hard on opposing tooth
    Abfraction
  28. Tooth to tooth wear on the incisal or occlusal surfaces-bruxium
    Attrition
  29. Chemical damage of the enamel
    Erosion
  30. 2 causes of erosion
    • Acidic foods - facial surface
    • Stomache acid - throwing up lingual surface
  31. Enamel forming cell
    Ameloblast
  32. Process of enamel formation
    Amelogenesis
  33. Enamel secreting surface of ameloblast - faces the DEJ
    Tome's process
  34. First stage of enamel formation
    Emelogensis
  35. Only partially mineralized @ start
    Begins formation @ insical edge or cusp tip
    Enamal matrix
  36. Is produced by living cells but is non vital itself
    Enamel
  37. T/F: enamel is the only part of a tooth that can be seen clinically
    True

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