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