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Anatomy Module II > Tooth histology > Flashcards

Flashcards in Tooth histology Deck (31):
1

Enamel

made by amelogensis and dissappear forever after
has varying thickenss from pits and fissure. no capacity to heal

2

pH ranges for dentin and remin

under 5.5 will demineralize and above 5.5 will remineralize

3

microscopical enamel

aceulluar avascular non dynamic

4

Enamel chemistry

90-92% 95-98% by weight of inroganix hydroxyapetite crystals
1-2% organic proteins
4-6% water

5

Enamel Rod Structural Unit

millions parallel
From DEJ to surface
it is subtle wavy

6

Length of Enamel Rod

avg length is longer than DEJ to surface line

7

One rod circumference

wider at the surface than at DEJ without woul be porous at surface
meets the DEJ at 90degrees

8

Cross Section of Rod shape

have a little tail and not perfectly round,

9

Inter rod substance

Aka rod sheath - is the water and protein

10

apatite crystals

are usually hydroxyapetite, and make up the rod substance

11

Things that mess with enamel

caries dissolbe, acid, dentists, teeth wear, things wear, cracks and breaks

12

Dentin Function

support of enamel.
Sensitive porous permeable
dynamic - can change

13

Structural Units of Dentin

Dentinal Tubules - pore in dentin
Peritubular Dentin - located around the tubule and hypermineralized
Intertubular Dentin- dentin between tubules and peri

14

AT DEJ tubule looks

many holes
Tubules are smallest at DEJ and increase in diamter as it goes to the pulp
Meaning there is more intertubular dentin at the DEJ

15

Intertubular Dentin histology

Type I collagen,
small crystals fill the spaces sooooo much like so salty
water is up in it

16

What is in the tubules

the odontoblast cell process and dentinal fluid aka mostly water

17

What happens to tubule upon extraction

it will dry up and the cell process goes away

18

odontoblast ell looks

columnar cell body
with extention up tubule
in the outer pulp inner dentin

19

Primary Dentin

dentin upon eruption (original)

20

Secondary Dentin

slow down production, we dont stop making it but slow it down

21

phsyiologic secondary dentin

either normal aging dentin, more irregular in shape pulp slowly gets smaller

22

reparitive dentin

made in sreponse to trauam. Reults in smaller pulp
This is done for protection

23

sclerotic dentin

through time or insult peritublear lays down more dentin for protection
resulting in less sensitive pulp less vulnerable

24

Pulp loks for young vs old.

pulp is big for a kid

25

Collateral Circulation

the pulp has no help from other vessels if there is drama
There is also no space for expansiion so many issue can happen

26

Functions of pulp

crucial in primary dentin, but after not needed
indirect fucntion is feeling pain

27

histology of pulp

depends on the person, it is vascular collagen and gorund substace
has odontoblasts lymph and blood vessels
also has asensory stuff

28

Sensory innervation

c fibers - send inflammation pain signals for dull pain from deep carries
A alpha fibers and A delta fibers - respond to fluid in wall of pulp send quick sharp pain that goes away quick

29

zone of weil

cell free zone below odontoblast layer location of cpaillary and blood vessel is below this

30

Principle fibers vs sharpays fibers

main fibers are the principle onees and the sharpays goes in tooth and bone to embed in alveolar bone connctino

31

cementum

hard covers clinical root, supportive. aceullar
except apical third is cellular
hard as bone