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27 Cards in this Set

  • Front
  • Back
largest structures in enamel
how big
where
-enamel rods
-4-5 ___ thick, and up to 3mm
-extend from DEJ to outer surface
Characteristic arrangement of apatite crystals: structures (3)
-rod core
-interrod substance
-rod sheath
in cross section enamel rods have a _______ or ______ pattern due to __________
-"key hole"/"fish scale"
-due to the orientation of apatite crystals
Rod core:
apatite crystals are oriented ___________
-parallel to long axis of rod
Interrod substance: orientation of apatite crystals
-oblique
rod sheath (2)
-boundary btw rod core and interrod substance
-due to increase in space and :. protein content
aptite crystal:
composed of
-thousands of modified calcium hydroxyapatite subunits
calcium hydroxyapatite
-Ca10(PO4)6(OH)2
enamel synthesis rate
-4 ____/day??
-but has diurnal variations (daily imbrication lines)
Lines of Retzius (2)
-product of cyclical variations (7-9 days) in enamel matric production
-also of shape of Tomes' process
neonatal line
-exaggerated line of Retzius
perikymata (2)
-shallow grooves
-formed at the surface by the lines of Retzius
gnarled enamel (2)
-found at cusp tips and incisal edges
-consequence of the individual paths taken by ameloblasts/groups of ameloblasts (and :. the enamel rods)
Hunter-Schreger bands (3)
-found in lateral enamel
-made by enamel rods w/ diff orientations
-reflect light
Enamel spindles (3)
-area of hypomineralization
-terminal ends of dentinal tubes
-tubes were trapped btw ameloblasts during enamel matriz synth
Enamel tufts (2)
-hypomineralized enamel
-extend a bit from the DEJ
Enamel lamellae (3)
-hypomineralized areas
-leaf-like
-may extend to surface
DEJ is characterized by ______
what is this area
-"scalloped border"
-specialized zone of transition (btw enamel and dentin)
Dentin (2)
-highly permeable
-numerous dentinal tubules
dentinal tubules (2)

how many (2)
-make dentin permeable
-have S-shaped curves in crown (from inward apposition)

-20,000-30,000/mm^2 at DEJ
-even more nearer to pulp
intertubular dentin
-normal mineralized dentin
intratubular dentin (2)
-highly mineralized sheath
-added to inside of tubule
sclerotic dentin (2)
-formed when tubules are completely occluded by intratubular dentin
-or clinically by use of a sclerosing solution
dead tracts
-groups of empty tubules (only fluid-filled)
Lines of von Ebner (2)
-represent changes in collagen matrix orientation
-occur approx every 5 days
globular dentin
-mix of normal and hypomineralized dentin
regions of hypomineralized dentin
-interglobular dentin