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Histology SU2017 > Lecture 6- Enamel tissue (melfi) > Flashcards

Lecture 6- Enamel tissue (melfi) Flashcards

1
Q

Is enamel a connective tissue?

A

No, only one of the 4 tissues of the tooth that is not

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2
Q

Does enamel have an unmineralized or preenamel formation stage?

A

No, only one of the 4 that does not

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3
Q

Enamel is the …. mineralized tissue to appear in a developing tooth

A

2nd (dentin is first and)

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4
Q

enamel does not contain… fibers unlike the other 3

A

collagen

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5
Q

Enamel has a … stage and a … stage

A

immature (partially mineralized)

mature (fully mineralized)

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6
Q

Enamel is an … derived tissue and is formed by a specialized…

A 
ectodermal
epithelial cell (ameloblast)
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7
Q

Enamel tissue is a composite biological mineral with….. oriented in a complex 3D pattern

A

apatite crystals (HA)

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8
Q

T/F: HA crystals are in all 4 of the mineralized tissues

A

true

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9
Q

Mohs mineral hardness of apatite

A

5 (diamond is 10)

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10
Q

Enamel’s weight is 96% …

A

inorganic substance (hydroxyapatite crystals). principal mineral is calcium hydroxyapatite

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11
Q

calcium hydroxyapatite formula

A

Ca10(PO4)6(OH)2

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12
Q

Enamel’s weight is 1%…

A

organic substance- mainly amelogenin

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13
Q

Enamel’s weight is 3%….

A

water, most of the water forms a hydration shell around each crystal

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14
Q

growth lines of enamel are called

A

strae of Retzius

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15
Q

growth lines of dentin are called

A

von Ebner

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16
Q

growth lines of cementum are called

A

lines of slater

17
Q

growth lines in bone are called

A

lamellae

18
Q

… are numerous small transverse ridges on the exposed surfaces of enamel

A

perikymata

19
Q

Striae or lines of Retzius end on the enamel surface as grooves, and ridges are created between the grooves. The ridges are called

A

perikymata

20
Q

Each enamel rod is formed by

A

one ameloblast

21
Q

Two or more ameloblasts secrete…

A

interrod substance

22
Q

Enamel is composed of…. , … and…

A

enamel rods
enamel sheath
interrod substance

23
Q

The structures of enamel are due to the… and … of the apatite crystals in each site

A

direction and density

24
Q

3 hypomineralized enamel structures

A

enamel lamella
enamel tuft
enamel spindle

25
Q

lamella start at….. and passes…

A

enamel surface

inward

26
Q

tufts start at…. and passes into…

A

DEJ

enamel

27
Q

spindle starts in…. passes… and into…

A

dentin
DEJ
enamel

28
Q

Hunter-schreager bands are caused by

A

the different direction of enamel rods in adjacent layers

29
Q

Hunter-Schreager bands are regarded as a….. minimizing the risk of cleavage in the axial direction under the influence of masticatory forces

A

functional adaptation

Histology SU2017 (14 decks)

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