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Flashcards in tooth development Deck (57)
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1

all body tissues develop from 3 primary embryonic layers, what are they?

. ectoderm
. mesoderm
. endoderm

2

which primary embryonic layer does the enamel develop from?

ectoderm

3

which primary embryonic layer do all parts of the teeth and supporting structure other than the enamel develop from?

ectomesenchyme

4

what is ectomesenchyme derived from?

neural crest

5

what do teeth develop from?

tooth germs

6

what is neural crest tissue referred to?

ectomesenchyme

7

neural crest tissue migrates into what?

developing face and jaw

8

name the 5 stages of tooth development

initiation, bus stage, cap stage, bell stage, eruption

9

what occurs during the initiation stage of tooth development?

. oral epithelium proliferates into the ectomesenchymal cells situated below to form a primary epithelial band
. primary epithelial band differentiates into vestibular lamina and dental lamina containing tooth germs

10

at how many weeks does the primary epithelial band develop?

6

11

at how many weeks does the primary epithelial band differentiate into dental lamina and vestibular lamina?

7

12

what is the function of dental lamina?

structure from which tooth is formed

13

what is the function of vestibular lamina?

breaks down to from buccal suculus

14

when does the bud stage of tooth formation start?

8-10 weeks

15

what occurs during the bud stage of tooth development?

- dental lamina thickens into a bud stage enamel organ
- ectomesenchymal cells condense to form dental papilla

16

when does the cap stage of tooth formation start?

11 weeks

17

what occurs during the cap stage of tooth development?

tooth bud forms a cap over the papilla

18

the tooth bud is arranged into 3 parts, what are these?

enamel organ, detal papilla and dental follicle

19

at which stage are the internal and external enamel organ epithelium seen for the first time?

cap stage

20

where do the internal and external enamel epithelium meet?

cervical loop

21

when does the bell stage of tooth formation start?

14 weeks

22

what occurs during the bell stage of tooth development?

more cell layers differentiate and tooth shape is formed

23

how many layers are there during the bell sated of tooth development?

4

24

name the 4 layers present during bell stage of tooth formation

stellate reticulum, internal enamel epithelium, external enamel epithelium, stratum intermedium

25

what is the function of the stellate reticulum?

supporting tissue during enamel formation

26

where is the the stratum intermedium?

developing tooth layer between inner epithelium and stellate reticulum

27

the does the dental lamina for the permanent successor tooth appear?

week 12

28

what does the dental lamina of permanent successor tooth appear as?

an extension of the lingual side of dental lamina

29

what occurs during the late bell stage of tooth formation?

crown shape is well defined and enamel and dentin begin to from

30

during the formation of dentin, dental papilla cells adjacent to the internal enamel epithelium differentiate into which cells?

odontoblasts