Tooth Development

Question 1

Beginning Steps post Fertilization

Answer 1

fertilization - zygote to blastocyste, with embryoblast and tropoblast

Question 2

Ectoderm

Answer 2

considered epithelium becomes epidermis skin CNS and tooth enemel

Question 3

Neural Crest Cells

Answer 3

The the junction migrate from tip to underlying mesenchymal layer to form head neck CT dentin and support structures

Question 4

Endoderm

Answer 4

epithelium gut tube

Question 5

mesoderm

Answer 5

one of the layers forms blood vessels bone and CT

Question 6

Ectomesenchyme

Answer 6

derived from cret forms dentin cementum PDL and alveolar bones

Question 7

primary epithelial Band

Answer 7

Proliferated at site of dental arches with two subdivision

Question 8

two subdivisions after primary epithelial band

Answer 8

dental lamina - horshoe shape of eptithelium where develop jaw
Vestibular lamina cells - will build up and breakdown to form the vestibule

Interactions between these two will dictate progression through the steps

Question 9

Ectoderm (major keys)

Answer 9

is epithelium folded into embryo as anterior of oral cavity. No blood Supply to epithelial receoived from ectomesenchyme

Question 10

what are the four stages

Answer 10

initiation bud cap bell

Question 11

enamel organ

Answer 11

epithelium ingrowth from dental lamina will become enamel

Question 12

dental papilla

Answer 12

is condensing ectomesenchyme will be dentin and pulp

Question 13

dental folical /sac

Answer 13

around the lateral lamina tooth give rise to cementum pdl and alveolar bone

Question 14

Stage I Bud Things

Answer 14

The tooth bud grows into ectomesenchyme

Builds cells are proliferating

Question 15

Stage II cap Stage

Answer 15

Invagination of deep surface 
start to see neamel organ forming 
See dental papilla 
Dental Follicle and 
Enamel Organ

Question 16

Two regions of enamel organ

Answer 16

center really hydrated cells pulling appart and held by desmosomes, are stellate reticulum

Question 17

inner enamel epithelium

Answer 17

Adjacent to the dental papilla give rise to ameloblasts

Question 18

Stratum intermedium

Answer 18

between inner enamle epithelium and stellate reticulum withs with inner to form enamel

Question 19

outer nemal epithelium

Answer 19

on the other side of the enemal organ does not make enamel

Question 20

Stage III the bell stage

Answer 20

see the four section of outer enamel epithelium stellate reticulum stratum intermedium and inner dental epithelium

Question 21

Cervical Loop

Answer 21

the inner and outer epitheluim continous loop they bend this will become hertwigs root sheath to make root

Question 22

Bell Stage Things that ahppend

Answer 22

dental lamina and lateral lamina degenerate
loose connection with oral cavity, (like now there is stuff over it)
shape begins and crown forms final shape

Question 23

what happens if lateral and dental lamina dont degnerate

Answer 23

get cysts

Question 24

why can we break through epithelium

Answer 24

junctional epithelium anchoring of basal lamina to tissue allows tight protection from things

Question 25

Blood supply in dental papilla

Answer 25

diromg cap phase also the dental sac is vascular

Question 26

Hard tissue formation

Answer 26

first dental papilla form odontoblasts. This is initiated by inner enamel epithelium to form dentin. Then the odontoblasts signal the inner dental epitehlium to be epithelium to form enamel

Question 27

What hard tissue is always first

Answer 27

There is recipricol induction odontoblasts always first

Question 28

inner enamel epithelium - signal and making of dentin

Answer 28

signals under induction from preamelioblasts cells become columnar and odontoblasts odontoblast secrete predentin and take 1 day to make dentin

Question 29

Direction of dentin secretion

Answer 29

moves towrad papilla, with apical processes residing in the dentinal tubules

Question 30

PRedentin staingin

Answer 30

much paler staingin

Question 31

Ameloblast signaling

Answer 31

odontoblasts signal ameloblast to secrete enamel enamel is secete and mineralizaed almost immediately and it moves away fro mbllod suppl y with time the layers of dentin impede on blood supply so enamel stop

Question 32

what is lost with tooth eruption

Answer 32

ameloblast

Question 33

what happens at enamel full thickness

Answer 33

stratum intermedium stellate reticulam and enamel epithelium form the papillary layer, tTogether with the ameloblast for the reduced dental epithelium

Question 34

Reduced dental epithelium

Answer 34

the ameloblast and papillary layer thin layer over the enamel

Question 35

Fate of dental folicle

Answer 35

formef by the suport tissues form cementoblasts PDL and alvoelar bone

Question 36

Periodontal Ligament formation

Answer 36

from the follicle (ectomesenchym) | connective tissue is collagen I and has high rate of turnover

Question 37

Tooth eruption

Answer 37

tooth covered by reduced enamel epithelium bone is resorbed before and so is CT over the tooth to reduce blood reduced epithelium and oral epithelium fuse central epithelium breaks in advance break thorugh with the robust colar to protect dentinogingival junction becomes junctional epithelium of gingiva