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Anatomy Module II > Tooth Development > Flashcards

Tooth Development Flashcards

1
Q

Beginning Steps post Fertilization

A

fertilization - zygote to blastocyste, with embryoblast and tropoblast

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2
Q

Ectoderm

A

considered epithelium becomes epidermis skin CNS and tooth enemel

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3
Q

Neural Crest Cells

A

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

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4
Q

Endoderm

A

epithelium gut tube

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5
Q

mesoderm

A

one of the layers forms blood vessels bone and CT

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6
Q

Ectomesenchyme

A

derived from cret forms dentin cementum PDL and alveolar bones

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7
Q

primary epithelial Band

A

Proliferated at site of dental arches with two subdivision

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8
Q

two subdivisions after primary epithelial band

A

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

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9
Q

Ectoderm (major keys)

A

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

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10
Q

what are the four stages

A

initiation bud cap bell

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11
Q

enamel organ

A

epithelium ingrowth from dental lamina will become enamel

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12
Q

dental papilla

A

is condensing ectomesenchyme will be dentin and pulp

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13
Q

dental folical /sac

A

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

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14
Q

Stage I Bud Things

A

The tooth bud grows into ectomesenchyme

Builds cells are proliferating

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15
Q

Stage II cap Stage

A 
Invagination of deep surface 
start to see neamel organ forming 
See dental papilla 
Dental Follicle and 
Enamel Organ
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16
Q

Two regions of enamel organ

A

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

17
Q

inner enamel epithelium

A

Adjacent to the dental papilla give rise to ameloblasts

18
Q

Stratum intermedium

A

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

19
Q

outer nemal epithelium

A

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

20
Q

Stage III the bell stage

A

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

21
Q

Cervical Loop

A

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

22
Q

Bell Stage Things that ahppend

A

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

23
Q

what happens if lateral and dental lamina dont degnerate

A

get cysts

24
Q

why can we break through epithelium

A

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

25
Q

Blood supply in dental papilla

A

diromg cap phase also the dental sac is vascular

26
Q

Hard tissue formation

A

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

27
Q

What hard tissue is always first

A

There is recipricol induction odontoblasts always first

28
Q

inner enamel epithelium - signal and making of dentin

A

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

29
Q

Direction of dentin secretion

A

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

30
Q

PRedentin staingin

A

much paler staingin

31
Q

Ameloblast signaling

A

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

32
Q

what is lost with tooth eruption

A

ameloblast

33
Q

what happens at enamel full thickness

A

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

34
Q

Reduced dental epithelium

A

the ameloblast and papillary layer thin layer over the enamel

35
Q

Fate of dental folicle

A

formef by the suport tissues form cementoblasts PDL and alvoelar bone

36
Q

Periodontal Ligament formation

A

from the follicle (ectomesenchym)

connective tissue is collagen I and has high rate of turnover

37
Q

Tooth eruption

A

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

Anatomy Module II (9 decks)

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