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Chiego Ch.7 Enamel

Terms in this set (25)

What is the hardest tissue in the body?
enamel
Enamel is __________ and subject to fracture.
brittle
How organic is enamel? How mineralized?
96%
What is enamel made of?
calcium and hydroxyapatite (inorganic), water and enamelin (organic)
How thick is enamel?
knife edge to about 2.5 mm thick. It is thickest where the incisal or occlusal load is heaviest
What are enamel rods?
prisms, extending from the DEJ to the outer surface of the enamel.
What are enamel rods produced from?
ameloblasts
________ ameloblast forms the rod head, _________ ameloblasts forms the neck and a _________ ameloblast forms the tail.
one
two
fourth
The surface of the enamel rod is called the?
rod sheath
The center of the rod is called the ______, it is the most sensitive to demineralization.
core
Light and dark bands in enamel are called?
Hunter-Schreger bands
Hunter-schreger bands extend through _________ to ________ of the thickness of enamel.
1/2, 2/3
Incremental lines are?
brown lines in the enamel.
Incremental lines are also called?
Striae of Retzius
What causes incremental lines or Striae of Retzius?
they are the result of the rhythmic recurrent deposition of enamel.
What is the neonatal line?
accentuated incremental line of Retzius due to environmental nutritional changes at the time of birth.
Where are enamel lamellae?
in the surface of enamel, extending from the cervical to the incisal surfaces, DEJ to the enamel surface.
Are enamel lamellae visible to the naked eye?
Yes
Breathing cold air is a risk factor when developing ___________________.
enamel lamellae, cold air makes the tooth sensitive
What are enamel tufts?
Developmental defects at the DEJ, that are filled with organic material (enamelin).
What does an enamel spindle do?
houses a small extension of a living odontoblast.
Where are enamel spindles?
they arise at the DEJ and extend into enamel
What are perikymata (imbrication lines)?
external manifestations of the striae of Retzius. They are growth lines visible as ridges.
Where are perikymata more prominent?
near the cervical region on the facial surface of teeth.
Prismless enamel ______________ facilitate the spread of dental caries.
does not
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