ch 14 embryo

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jackiedh
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50593
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ch 14 embryo
Updated:
2010-11-19 12:54:13
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Periodontium CEMENTUM
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ch 14 Periodontium-CEMENTUM
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  1. what is the most important part for hygienists concerning oral health?
    periodontium
  2. the hard and soft tissues that support the teeth is:
    periodontium
  3. what are the three components of periodontium?
    • cementum
    • alveolar bone
    • PDL (connects cementum to bone)
  4. where does cementum come from?
    mesoderm
  5. what component covers the entire root?
    cementum (like enamel covering the crown)
  6. one end of attachment for the PDL is ___________ and the other is the alveolar bone
    cementum
  7. is cementum AVASCULAR or VASCULAR?
    AVASCULAR
  8. where does it get its nourishment?
    from the PDL OUTSIDE of the tooth
  9. cementum is _____ % mineralized, enamel is ____% mineralized and dentin is ______% mineralized
    • 65%
    • 96% (or high 90s)
    • 70%
  10. remember....the ameloblasts couldn't create enamel because they didn't have their _______, the ondontoblasts started laying ________ matrix
    • support
    • dentin
  11. THE NEWLY FORMED DENTIN induced the cells of the ________ _____ to differentiate into ___________
    • dental sac
    • cementoblasts
  12. Cementoblasts laid their _________ and some of the cementoblasts got caught in the matrix and became ___________
    • cementoid (matrix)
    • cementocytes
  13. the ends of the PDL that have embedded themselves into the cementum
    Sharpey's Fibers
  14. where the cementum and enamel meet
    CEJ
  15. what are the three types of CEJs where they meet?
    • overlap
    • meet
    • gap
  16. in overlap of the CEJ the cementum overlaps the enamel because:
    the enamel was formed first
  17. what type of meeting of the CEJ may be mistaken with calculus?
    overlap
  18. which meet PERFECTLY in the middle?
    MEET of the CEJ
  19. when there is a space between the cementum and enamel, the underlying dentin is exposed, this is called:
    GAP of the CEJ
  20. which meeting type of the CEJ can cause dentin hypersensitivity?
    GAP, esp with recession. eyechihuahua!
  21. what are the two different lines of cementum repair?
    • reversal lines
    • you are under arrest lines
  22. after cementum resorption, you can tell where the resorption stopped and started laying down new cementum, these are called:
    reversal lines
  23. just like Retzius lines with enamel and lines of Von Ebner with dentin, for cementum they are called:
    Arrest Lines
  24. name the two types of cementum
    • acellular
    • cellular
  25. the first cementum to get laid down, no cementocytes is:
    ACELLULAR
  26. the last cementum to get laid down is:
    CELLULAR phone
  27. which cementum gets laid at a quicker pace so the cementoblasts get stuck in it?
    CELLULAR (when on your CELLULAR, you say, BLAST! i am STUCK talking to Uncle QUICK)
  28. T/F the cementoblasts that DON'T get stuck migrate to the periphery of the cellular cementum and wait there until more cementum is needed.
    TRUE! Heaven be Praised some didn't get stuck!
  29. name three clinical considerations with cementum:
    • cementicles
    • cemental spurs
    • hypercementosis
  30. kind of like a clam and a grain of sand, the clam doesn't like it, spits on it and creates a pearl _________ are similar in cementum
    cementicles
  31. cementicles: cementoblasts start to lay _________ around cellular ________ in the PDL
    • cementoid
    • debris
  32. a cementicle can just float there or start to fuse with ________ as more is laid
    cementum
  33. what starts as debris or floating in the PDL?
    cementicles
  34. clinical consideration that was laid down screwy and caused a spur of cementum to come off the CEJ, similar to enamel pearls
    cemental spur
  35. excessive production of cementum is which clinical consideration of cementum?
    hypercementosis
  36. this clinical consideration results from occlusal trauma (clenching/grinding)
    hypercementosis

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