Dental Anatomy

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Dental Anatomy
2010-12-12 00:01:18
Chapter twelve

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  1. crystaline material that is the hardest calcified tissue in the human body
  2. composition of enamel
    • 96% inorganic
    • 1% organic
    • 3% water
  3. true or false. Enamel is avascular, and has no nerves.
  4. true or false. enamel is vital and renewable.
    false. enamel is nonvital and nonrenewable
  5. what are the main functions of enamel?
    • mastication
    • speech
    • whiteness/aesthetics
  6. the process of enamel matrix formation that occurs during the apposition stage of tooth development
  7. where do ameloblast cells come from? And what type of cells are they?
    • the IEE
    • columnar cells
  8. the secratory surface of the ameloblast that faces the dentinoenamel junction. It secrete's the enamel matrix (pooper)
    tome's process
  9. enamel matrix that is first formed in the incisal/occlusal portio of the future crown near the forming DEJ, by ameloblasts pumping calcium hydroxyapatite into the forming enamel matrix secreted by the tome's process. A partially mineralized state.
    first wave of enamel apposition
  10. when does the enamel matrix complete its mineralization process?
    during the maturation stage, after the apposition of enamel matrix, when it is 30% mineralized
  11. true or false. enamel mineralization continues after eruption of the tooth.
  12. what is the function of ameloblasts during the maturation of enamel matrix?
    continue to actively pump more calcium hydroxyapatite into the partially mineralized enamel, and withdraw an equal amount of organic materials at the same time.
  13. what are 3 clinical considerations to look for in accordance to the apposition stage of enamel development?
    • enamel pearls
    • enamel dysplasia
    • weak areas of pits and grooves that are very susceptible to biofilm
  14. what happens to ameloblasts when they are finished with both enamel apposition and maturation?
    they become part of the reduced enamel epithelium
  15. what is the function of REE in regards to tooth eruption?
    it fuses with the oral mucosa, creating a canal to allow the enamel cusp tip to erupt through the oral mucosa into the oral cavity
  16. what is Nasmith's membrane?
    the residue that is left behind from the old ameloblast cells that are no more once the tooth has erupted
  17. true or false. mineralization of emanel continues to occur after eruption of the tooth. If so, why?
    • true
    • de to deposition of minerals such as flouride and calcium from saliva
  18. the crystaline structural unit of enamel
    enamel rods
  19. what dictates the shape of the enamel rod?
    Tome's process
  20. how big are enamel rods in diameter?
    4 micrometers
  21. outer region surrounding each enamel rod. Region that gets 'bleached'
    inerprismatic region
  22. slight ridges that extedn mesial to distal in the cervical third on certain teeth
    imbrication lines
  23. incremental lines in preparation of mature enamal, they are microscopic and developmental
    lines of Retzius
  24. grooves in between imbrication lines evident on some teeth
  25. What are some things that can attribute to hard tissue/enamel loss?
    • attrition-tooth wearing
    • erosion-wearing away by chemicals from within or wihout (vomiting)
    • abrasion-mechanical tooth brush
    • caries
    • abfraction-enamel chips off