Embryology Chapter twelve

  1. The enamel is developed from______________everything else on the tooth is developed from_________________.
    • Ectoderm
    • Mesoderm
  2. ______________is the hardest substance in the body, and is_____________calcified.
    • Enamel
    • 98%
  3. Are there nerves or blood vessels in our enamel? Why is this a good thing?
    • No
    • because our teeth would ALWAYS be sensative if we did
  4. What does enamel consist of?
    calcium hydroxyapatite - Ca10(PO4)6(OH)2
  5. Describe the color of enamel
    bluish - white, but it looks yellow because of the dentin underneath
  6. When does the tooth start to bleed?
    once we've gotten into the pulp - enamel and dentin do not bleed
  7. What is the chemical formula for calcium hydroxyapatite?
  8. The process of enamel matrix formation that occurs during the apposition stage of tooth development.
  9. amelogenesis, or the laying of the enamel matrix occurs during which stage?
  10. The secretory surface of the ameloblast that dictates the hexagonal shape of each pillar (ada enamel rods) of enamel
    tome's process
  11. What is the shape of each enamel rod? Why is it shaped like this?
    • hexagonal
    • because the opening of the tome's process is shaped this way and lays the enamel rods
  12. true or false. tome's process gives enamel rods a very distinct shape
  13. Matrix is first formed at the________________and laid in waves (like a volcano) until it gets to the______________.
    • incisal edges
    • CEJ
  14. enamel rods run____________to the DEJ
  15. during what stage of tooth development does the enamel complete its mineralization process as ameloblasts pump hydroxyapatite into the matrix?
    maturation stage
  16. stage of tooth development when minerals (hydroxyapaetite) come in and calcify the enamel
    maturation stage
  17. What pumps hydroxyapatite into the enamel matrix?
  18. similar to apposition, enamel mineralization starts at the______________and moves to the____________
    • incisal edges
    • CEJ
  19. true or false. Enamel matrix is further mineralized even after the tooth erupts
  20. What is the enamel matrix mineralized by after the tooth erupts?
    fluoride and calcium ions in saliva
  21. the crystalline structural unit of enamel
    enamel rod
  22. enamel rods extend_______________to the DEJ
  23. the space between each enamel rod where stain collects
    interprismatic region
  24. Was formerly the basement membrane (that formed the battle lines) between the enamel organ and the dental papilla
    dentinoenamel junction
  25. mature enamel is layed in________________and resembles tree rings
    incremental lines
  26. incremental lines showing that enamel is secreted cyclically
    lines of retzius
  27. raised scale-like pattern of enamel
    imbrication lines
  28. the grooves between each of the scales, or imbrication lines
  29. an eccentuated (dark) incremental line of Retzius because of the trauma at birth
    neonatal line
  30. odontoblasts that crossed the basement membranes and get stuck in the forming enamel, they are asymptomatic
    enamel spindles
  31. name 2 crystallization anomalies
    • enamel tufts
    • enamel lamellae
  32. small, dark brushes with their bases near the DEJ. They didn't crystallize correctly, and are asymptomatic
    enamel tufts
  33. partially calcified enamel sheets that extend from the DEJ to the occlusal surface, they are narrower and longer than tufts and are asymptomatic
    enamel lamellae
Card Set
Embryology Chapter twelve
Enamel 1