Tooth histology

Question 1

Enamel

Answer 1

made by amelogensis and dissappear forever after

has varying thickenss from pits and fissure. no capacity to heal

Question 2

pH ranges for dentin and remin

Answer 2

under 5.5 will demineralize and above 5.5 will remineralize

Question 3

microscopical enamel

Answer 3

aceulluar avascular non dynamic

Question 4

Enamel chemistry

Answer 4

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

Question 5

Enamel Rod Structural Unit

Answer 5

millions parallel
From DEJ to surface
it is subtle wavy

Question 6

Length of Enamel Rod

Answer 6

avg length is longer than DEJ to surface line

Question 7

One rod circumference

Answer 7

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

Question 8

Cross Section of Rod shape

Answer 8

have a little tail and not perfectly round,

Question 9

Inter rod substance

Answer 9

Aka rod sheath - is the water and protein

Question 10

apatite crystals

Answer 10

are usually hydroxyapetite, and make up the rod substance

Question 11

Things that mess with enamel

Answer 11

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

Question 12

Dentin Function

Answer 12

support of enamel.
Sensitive porous permeable
dynamic - can change

Question 13

Structural Units of Dentin

Answer 13

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

Question 14

AT DEJ tubule looks

Answer 14

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

Question 15

Intertubular Dentin histology

Answer 15

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

Question 16

What is in the tubules

Answer 16

the odontoblast cell process and dentinal fluid aka mostly water

Question 17

What happens to tubule upon extraction

Answer 17

it will dry up and the cell process goes away

Question 18

odontoblast ell looks

Answer 18

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

Question 19

Primary Dentin

Answer 19

dentin upon eruption (original)

Question 20

Secondary Dentin

Answer 20

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

Question 21

phsyiologic secondary dentin

Answer 21

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

Question 22

reparitive dentin

Answer 22

made in sreponse to trauam. Reults in smaller pulp

This is done for protection

Question 23

sclerotic dentin

Answer 23

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

Question 24

Pulp loks for young vs old.

Answer 24

pulp is big for a kid

Question 25

Collateral Circulation

Answer 25

the pulp has no help from other vessels if there is drama

There is also no space for expansiion so many issue can happen

Question 26

Functions of pulp

Answer 26

crucial in primary dentin, but after not needed

indirect fucntion is feeling pain

Question 27

histology of pulp

Answer 27

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

Question 28

Sensory innervation

Answer 28

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

Question 29

zone of weil

Answer 29

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

Question 30

Principle fibers vs sharpays fibers

Answer 30

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

Question 31

cementum

Answer 31

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