chapter 12 enamel

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jackiedh
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47670
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chapter 12 enamel
Updated:
2010-11-07 13:14:57
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embryology
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ch 12 embryology
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  1. enamel is developed from ___________
    ECTODERM
  2. everything besides enamel is developed from ___________
    MESODERM
  3. what is the hardest calcified tissue in the human body and at what percentage is it calcified?
    • enamel
    • 98%
  4. enamel on an x-ray film appears ___________
    radiopaque
  5. are there nerves or blood vessels in enamel?
    why?
    • no
    • teeth would constantly hurt
  6. enamel is _________-__________ (color) but is also _________ due to underlying dentin
    • bluish-white
    • yellow
  7. what is the distinct process that secretes the enamel matrix?
    Tome's process
  8. the tome's process dictates the ________ shape of each pillar aka _______ ______ of enamel
    • hexagonal
    • enamel rods
    • (the icing tip that gives shape of the enamel)
  9. the shape of the ________ _________ = the shape of the enamel
    tome's process
  10. where is the matrix of the tooth first formed at? and where does it end up?
    incisal laid in waves to the CEJ
  11. what is the apposition of the enamel matrix?
    tome's process
  12. what is happening at the maturation of the enamel matrix
    mineralization
  13. what do the ameloblasts pump into the matrix during maturation?
    hydroxy apatite
  14. T/F like apposition, maturation mineralizes starting at the incisal and moves to the CEJ
    true!
  15. after the tooth erupts, what is it further being mineralized by?
    fluoride and calcium ions in the saliva
  16. what are the 2 components of mature enamel?
    • enamel rods
    • interprismatic region
  17. what is the crystalline structural unit of enamel
    enamel rods
  18. what is the space between each enamel rod where stain collects (like grout around tile)
    interprismatic region
  19. in mature enamel, rods extend ______________ to the ______
    • PERPENDICULAR
    • DEJ
  20. what was the basement membrane that formed that battle lines?
    DEJ
  21. what are incremental lines?
    the start to stop of ameloblasts (same as tree rings)
  22. what are the four incremental lines?
    • lines of retzius
    • imbrication lines
    • perikymata
    • neonatal line
  23. what are the four listed microscopic features of mature enamel?
    • DEJ
    • incremental lines
    • enamel spindles
    • crystallinization anomalies
  24. incremental lines showing that enamel is secreted cyclically is:
    lines of retzius
  25. the raised scale-like pattern of enamel (stacked fish scales):
    imbrication lines
  26. the grooves between each of the scales:
    perikymata
  27. an accentuated incremental line because of the trauma at birth (darkest line):
    neonatal line
  28. ondontoblasts that crossed the basement membranes and get stuck in the forming of enamel. asymptomatic. these are called:
    enamel spindles
  29. what are the two types of crystallization anomalies?
    • enamel tufts
    • enamel lamellae
  30. small, dark brushes with their bases near the DEJ. didn't crystallize correctly. asymptomatic. these are called:
    enamel tufts
  31. partially calcified enamel sheets that extend fro the DEJ to the occlusal surface. narrower and longer than enamel tufts. asymptomatic
    enamel lamellae

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