Lecture 6- Enamel tissue (melfi) Flashcards
Is enamel a connective tissue?
No, only one of the 4 tissues of the tooth that is not
Does enamel have an unmineralized or preenamel formation stage?
No, only one of the 4 that does not
Enamel is the …. mineralized tissue to appear in a developing tooth
2nd (dentin is first and)
enamel does not contain… fibers unlike the other 3
collagen
Enamel has a … stage and a … stage
immature (partially mineralized)
mature (fully mineralized)
Enamel is an … derived tissue and is formed by a specialized…
ectodermal epithelial cell (ameloblast)
Enamel tissue is a composite biological mineral with….. oriented in a complex 3D pattern
apatite crystals (HA)
T/F: HA crystals are in all 4 of the mineralized tissues
true
Mohs mineral hardness of apatite
5 (diamond is 10)
Enamel’s weight is 96% …
inorganic substance (hydroxyapatite crystals). principal mineral is calcium hydroxyapatite
calcium hydroxyapatite formula
Ca10(PO4)6(OH)2
Enamel’s weight is 1%…
organic substance- mainly amelogenin
Enamel’s weight is 3%….
water, most of the water forms a hydration shell around each crystal
growth lines of enamel are called
strae of Retzius
growth lines of dentin are called
von Ebner
growth lines of cementum are called
lines of slater
growth lines in bone are called
lamellae
… are numerous small transverse ridges on the exposed surfaces of enamel
perikymata
Striae or lines of Retzius end on the enamel surface as grooves, and ridges are created between the grooves. The ridges are called
perikymata
Each enamel rod is formed by
one ameloblast
Two or more ameloblasts secrete…
interrod substance
Enamel is composed of…. , … and…
enamel rods
enamel sheath
interrod substance
The structures of enamel are due to the… and … of the apatite crystals in each site
direction and density
3 hypomineralized enamel structures
enamel lamella
enamel tuft
enamel spindle
