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Clarke- Enamel
Enamel
35
Anatomy
Professional
10/21/2012

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Cards

Term
What kind of material is enamel?
Definition
crystalline material
Term
What is the hardest calcified tissue in the body?
Definition
enamel
Term
Does enamel have and nerves or blood vessels?
Definition
no it is avascular and does not contain any nerves
Term
Can you make more enamel throughout your life?
Definition
no, it is nonvital
Term
What percentage of enamel is inorganic?
Definition
96% inorganic
Term
What area of the tooth has the thickest enamel?
Definition
the incisal
Term
What do ameloblasts do during the maturation of enamel over time?
Definition
they pump more calcium hydroxyapatite crystals into the enamel matrix
Term
What happens to the organic material in enamel over time?
Definition
is it withdrawn
Term
How long does mineralization of enamel continue?
Definition
after eruption
Term
What happens to enamel minerals throughout life?
Definition
demineralization and remineralization
Term
What is amelogenesis?
Definition
the making of enamel
Term
Where is enamel matrix secreted from?
Definition
Tome's process
Term
What is the enamel matrix initially composed of?
Definition
proteins, carbohydrates, small amount of calcium hydroxyapatite crystals
Term
Where does the enamel matrix initially form?
Definition
in the incisal/occlusal third of the crown
Term
How are layers or enamel matrix deposited?
Definition
from DEJ towards OEE
Term
What are the two parts of enamel?
Definition
1.Enamel rod
2.Interprismatic region
Term
How many ameloblasts make up one enamel rod?
Definition
4
Term
What is the shape of enamel rods?
Definition
keyhole
Term
How many ameloblasts form the head? The tail?
Definition
1 form the head, 3 form the tail
Term
How do crystals in the rod grow?
Definition
until they are tightly packed
Term
What part of the enamel are the rods?
Definition
crystalline
Term
Where does each enamel rod extend from?
Definition
DEJ to the tooth surface
Term
Are all the rods the same length?
Definition
no they all vary in length, ones at the cusp are the longest, ones in the CEJ are the shortest
Term
What is the interprismic region of enamel matrix?
Definition
the areas surrounding each rod
Term
What is each rod encased in?
Definition
sheath
Term
What helps cement the rods together?
Definition
inner rod substance
Term
What is the interprismic region's purpose? What is it made of?
Definition
gives teeth flexibility, higher concentration of organic material and water
Term
How often is there a slight change in development of enamel?
Definition
about every 4 days, to make it more stable
Term
What are lines of Retzius?
Definition
evidence of slight change in direction that occurs every 4 days
Term
What are neonatal lines? Can we see them with the naked eye?
Definition
an accentuated line of retzius marks the stress ameloblasts undergo during the birth process
Term
What are enamel spindles?
Definition
dentinal tubules that crossed basement membrane and got trapped in enamel matrix
Term
What happens to the enamel around enamel spindles?
Definition
it mineralizes
Term
What are enamel tufts and enamel lamellae?
Definition
both anomaly of crystalization, they are less mineralized
Term
Where are enamel tufts found?
Definition
near the DEJ
Term
Where are enamel lamellae found?
Definition
extend from DEJ to the outer surface
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