Histology chapter 12.txt

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Histology chapter 12.txt
2010-05-12 23:56:47
histo chapt

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
  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
  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
  15. The ratio of ameloblast to enamel rods
  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
  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
  23. Hardest calcified tissue of the human body
  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
  28. Tooth to tooth wear on the incisal or occlusal surfaces-bruxium
  29. Chemical damage of the enamel
  30. 2 causes of erosion
    • Acidic foods - facial surface
    • Stomache acid - throwing up lingual surface
  31. Enamel forming cell
  32. Process of enamel formation
  33. Enamel secreting surface of ameloblast - faces the DEJ
    Tome's process
  34. First stage of enamel formation
  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
  37. T/F: enamel is the only part of a tooth that can be seen clinically