Tooth and Jaw Development Flashcards
1
Q
what’s the stages of tooth development?
A
primary epithelial band
dental lamina
bud stage
cap stage
bell stage
root development
2
Q
what week does the bud stage occur?
A
8 weeks
3
Q
what week does the cap stage occur?
A
10 weeks
4
Q
what week does the early bell stage occur?
A
14 weeks
5
Q
what week does the later bell stage occur?
A
18 weeks
6
Q
how do the dental arches begin to form?
A
week 6
- the primary epithelial band proliferates down into the mesenchyme
7
Q
a plate begins to form beneath the tooth germ, what is this?
A
the lateral plate of the mandible or maxilla
8
Q
describe the bud stage - 8 weeks.
A
ectomesenchyme condenses into:
- buccal placed vestibular lamina
- lingual placed dental lamina
9
Q
describe the cap stage.
A
- enamel organ formed from ectoderm
- contains enamel knot and enamel septum
- follicle - surrounds enamel organ, will produce dentine and pulp
- papilla - condensed mesenchymal cells, will produce periodontium, cementum, PDL
10
Q
describe the early bell stage - 14 weeks
A
morphodifferentiation
- shape of enamel epithelial become tall columnar cells, outlines crown
- cusp tips form
- lamina develops
- permanent molar teeth develop from lamina
11
Q
describe the late bell stage - 18 weeks
A
- mineralised tissue deposited
- enamel epithelial become pre-ameloblasts
- cells next to papilla elongate into odontoblasts
- odontoblasts - begin formation of predentine
