Embryology

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sweetpea281
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39267
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Embryology
Updated:
2010-10-03 11:19:20
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chapter6part1
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Initiation thru apposition and maturation
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  1. what is tooth development called?
    odontogenesis
  2. what are the three types of dentition?
    • primary dentition
    • secondary dentition
    • mixed dentition
  3. what is primary dentition?
    20 baby teeth that develop during the prenatal period and will be shed
  4. what is secondary dentition?
    32 adult teeth that develop during fetal period, though they mature for years after birth, will replace baby teeth
  5. what is mixed dentition?
    overlapping of time between primary and secondary dentitions
  6. what is the main developmental process that occurs during the initiation stage?
    induction
  7. During the _____ stage the ____ _____ grows deeper into the ______ and forms a new layer called the _____ _____
    • initiation
    • oral epithelium
    • ectomesenchym
    • dental lamina
  8. what is the "velcro between the oral epithelium and ectomesenchyme?
    basement membrane
  9. what is mesoderm that originally comes from the ectoderm?
    ectomesenchyme
  10. what does the oral epithelium come from?
    ectoderm
  11. what are the layers during the initiation stage?
    • oral epithelium
    • ectomesenchyme
    • basement membrane
  12. what are the developmental disturbances for the initiations stage?
    • Anodontia
    • suppernumary teeth
  13. what disturbances is the absence of teeth and what stage are they from?
    • anodontia
    • initiation stage
  14. what disturbance is extra teeth and what stage are they part of?
    • supernumary teeth
    • initiation stage
  15. what is the second stage in tooth development?
    bud stage
  16. what developmental process makes up the bud stage?
    proliferation only
  17. what happens during the bud stage?
    the finger like projection full of dental lamina starts to fatten up and look like a bud
  18. what are the developmental disturbances during the bud stage?
    • macrodontia
    • microdontia
  19. what is macrodontia and what stage is it from?
    • big teeth because of too much proliferation
    • bud stage
  20. what is microdontia and what stage is it from?
    • little teeth not enough proliferation
    • bud stage
  21. what is the third stage of tooth development?
    cap stage
  22. what developmental processes are involved in the cap stage?
    • proliferation
    • differentiation
    • morphogenesis
  23. the cells start ______ to become structurally/functionally different, what do they become?
    • Differentiating
    • enamel organ
    • dental papilla
    • dental sac
  24. what does the enamel organ come from and what will it produce?
    • dental lamina
    • enamel
  25. what does the dental papilla come from and what will it become?
    • ectomesenchyme
    • pulp and dentin
  26. what does the dental sac come from? what will it become?
    • ectomesenchyme
    • cementum, periodontal ligament and alveolar bone
  27. what three structures make up the tooth germ?
    • enamel organ
    • dental papilla
    • dental sac
  28. what is the first sign of morphogenesis?
    the tooth germ-created a structure
  29. what is the finger like projection that will be the adult tooth?
    successional dental lamina
  30. what is it called when adult teeth replace baby teeth?
    succedaneous
  31. what are adult teeth that don't replace baby teeth?
    nonsuccedaneous
  32. what are the developmental disturbances during the cap stage?
    • dens in dente
    • gemination
    • fusion
  33. what disturbance is a tooth within a tooth, the enamel organ gets lost in the dental papilla?
    dens in dente-forms enamel in the pulp
  34. what is a single tooth unsuccussfully tries to split into two?
    gemination-large single rooted tooth with two crowns
  35. what is it called when two tooth germs fuse together?
    fusion-one crown two roots
  36. what is the fourth stage in tooth development?
    bell stage
  37. through further _____ we now have new layers, what are these layers?
    • differentation
    • outer enamel epithelium
    • stellate reticulum
    • stratum intermedium
    • inner enamel epithelium
    • basement membrane
    • outer cells of dental papilla
    • inner cells of dental papilla
  38. what layer is the protective barrier during enamel formation?(cap stage)
    outer enamel epithelium
  39. what are the star shaped cells that support enamel production?
    stellate reticulum
  40. what layer is compressed layer of flat cells that support enamel production?
    stratum intermedium
  41. what layer in the cap stage will become the enamel secreting cells and what are these cells called?
    • inner enamel epithelium
    • ameloblasts
  42. what layer in the cap stage willl become the dentinoenamel junction?
    basement membrane
  43. what layer in the cap stage will become the dentin secreting cells? what are these cells called?
    • outer cells of dental papilla
    • odontoblasts
  44. what layer in the cap stage will become the dental pulp?
    inner cells of dental papilla
  45. what is the fifth stage of tooth development?
    apposition
  46. what is apposition?
    growth by layers-layers of dentin, cementum and enamel
  47. the ameloblasts and odontoblasts lie on either side of the _____ _____. as they each retreat they leave a slimy trail called ____. This is the structural foundation that is mineralized during the ____ _____.
    • basement membrane
    • matrix
    • maturation stage
  48. where do the cell bodies remain?
    dental pulp
  49. the odontoblasts leave attaced cellular extenstions called _____ ____, they are contained and prtected in mineralized cylinders of dentin called _____ ______.
    • odontoblastic processes
    • dentinal tubules
  50. what are the developmental disturbances during apposition and maturation?
    • enamel dysplasia-enamel hypoplasia and enamel hypocalcification, floursis
    • amelogenesis imperfecta
    • dentin dysplasia
    • dentinogenesis imperfecta
  51. what disturbance is a decreased QUANTITY of enamel matrix?
    enamel hypoplasia
  52. what disturbance is it when there is plenty of enamel matrix but the QUALITY is bade because it didn't fully mineralize?
    enamel hypocalcification
  53. what is fluorosis?
    too much fluoride during mineralization
  54. what disturbance is it when there is very thin or no enamel?
    amelogenesis imperfecta
  55. what disturbance is it when there is faulty development of the dentin?
    dentin dysplasia- can be hypoplasia or hypocalcification
  56. what disturbance is it when the teeth are blue-gray or brown because the dentin didn't form correctly?
    dentinogenesis imperfecta

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