Dental anatomy

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Dental anatomy
2010-12-13 16:36:24
Chapter twelve

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  1. enamel is a crystalline structure made up of mostly what substance?
    calcium hydroxyapatite
  2. What percent of enamel is mineralized by:
    inorganic material
    organic material
    • 96%
    • 1%
    • 3%
  3. What is the hardest substance in the body?
  4. true or false. enamel is avascular and has no nerves, and it is non-vital and not renewable
    both statements are true
  5. Enamel produces a hard substance that is useful in __________ and_________
    • mastication
    • speech
  6. What does enamel look like, color wise?
    shades of bluish white (it looks yellow because of the dentin underneath it
  7. process of enamel matrix formation that occurs during the apposition stage
  8. Enamel is first secreted at the __________ _____________ and continues in ____________
    • incisal edge
    • waves (like a volcano)
  9. cells that are derived from the IEE, produce the enamel matrix, secrete the enamel matrix from the tome's process, and differentiate ONLY in the crown
  10. does enamel maturation/mineralization continue after the tooth erupts?
  11. What type of cells are specifically responsible for enamel mineralization?
  12. true or false. Enamel mineralization happens in waves just like enamel formation
  13. cells that are made up of compressed enamel organ and spent ameloblasts
    Reduced enamel epithelium (REE)
  14. REE fuse with the __________ ____________
    oral mucosa
  15. What cells create a tunnel/canal for tooth eruption?
    REE reduced enamel epithelium
  16. When does the REE disintegrate and the ameloblasts are lost?
    upon tooth eruption
  17. residue from REE left on tooth
    nasmith's membrane
  18. mineralization of tooth structure after eruption is due to what?
    deposition of minerals from the saliva
  19. What are the microscopic components that make up mature enamel?
    enamel rods
  20. What is the shape of enamel rods?
    hexagonal because of tom'es process
  21. outer region surrounding each enamel rod, where stain collects in enamel. This area can be bleached
    interprismatic region
  22. slight ridges that exted mesial to distal in the cirvical third on certain teeth
    imbrication lines
  23. What teeth are imbrication lines usually seen on in enamel/
    maxillary central incisors
  24. these are associated with lines of retzius
    imbrication lines
  25. incremental lines in preparation of mature enamel, they are microscopic
    lines of retzius
  26. groove in between imbrication lines that are evident in some teeth
  27. wearing away of enamel cuz of tooth on tooth
  28. wearing away of enamel because of chemical means, like stomach acid or lemons
  29. wearing away of enamel from some sort of mechanical force like a tooth brush
  30. wearing away of enamel because of cariogenic bacteria
  31. wearing away of enamel because of unknow factors, maybe clenching, it breaks off at cervical area