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The enamel is developed from______________everything else on the tooth is developed from_________________.
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______________is the hardest substance in the body, and is_____________calcified.
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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
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What does enamel consist of?
calcium hydroxyapatite - Ca10(PO4)6(OH)2
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Describe the color of enamel
bluish - white, but it looks yellow because of the dentin underneath
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When does the tooth start to bleed?
once we've gotten into the pulp - enamel and dentin do not bleed
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What is the chemical formula for calcium hydroxyapatite?
Ca10(PO4)6(OH)2
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The process of enamel matrix formation that occurs during the apposition stage of tooth development.
amelogenesis
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amelogenesis, or the laying of the enamel matrix occurs during which stage?
apposition
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The secretory surface of the ameloblast that dictates the hexagonal shape of each pillar (ada enamel rods) of enamel
tome's process
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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
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true or false. tome's process gives enamel rods a very distinct shape
true
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Matrix is first formed at the________________and laid in waves (like a volcano) until it gets to the______________.
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enamel rods run____________to the DEJ
perpendicular
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during what stage of tooth development does the enamel complete its mineralization process as ameloblasts pump hydroxyapatite into the matrix?
maturation stage
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stage of tooth development when minerals (hydroxyapaetite) come in and calcify the enamel
maturation stage
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What pumps hydroxyapatite into the enamel matrix?
ameloblasts
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similar to apposition, enamel mineralization starts at the______________and moves to the____________
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true or false. Enamel matrix is further mineralized even after the tooth erupts
true
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What is the enamel matrix mineralized by after the tooth erupts?
fluoride and calcium ions in saliva
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the crystalline structural unit of enamel
enamel rod
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enamel rods extend_______________to the DEJ
perpendicular
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the space between each enamel rod where stain collects
interprismatic region
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Was formerly the basement membrane (that formed the battle lines) between the enamel organ and the dental papilla
dentinoenamel junction
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mature enamel is layed in________________and resembles tree rings
incremental lines
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incremental lines showing that enamel is secreted cyclically
lines of retzius
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raised scale-like pattern of enamel
imbrication lines
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the grooves between each of the scales, or imbrication lines
perikymata
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an eccentuated (dark) incremental line of Retzius because of the trauma at birth
neonatal line
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odontoblasts that crossed the basement membranes and get stuck in the forming enamel, they are asymptomatic
enamel spindles
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name 2 crystallization anomalies
- enamel tufts
- enamel lamellae
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small, dark brushes with their bases near the DEJ. They didn't crystallize correctly, and are asymptomatic
enamel tufts
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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
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