odontogenesis

Question 1

What are the stages of tooth development?

Answer 1

initiation stage (dental lamina)
bud stage
cap stage
bell stage (morphogenesis)
crown stage (apposition of enamel and dentin)
rooth growth
eruption
function
exfoliation (primary teeth only)

Question 2

What happens during initiation stage?

Answer 2

formation of continuous horseshoe-shape band of thickened epithelium
- formation of dental lamina

Question 3

bud stage

Answer 3

6-8 weeks in utero (primary teeth)

5months in utero to 9yrs (permanent teeth)

Question 4

when does the initiation stage happen?

Answer 4

37 days of pregnancy

Question 5

cap stage

Answer 5

formation of the enamel organ, dental papilla and dental follicle

Question 6

what is the enamel made up of?

Answer 6

outer enamel epithelium
inner enamel epithelium
stellate reticulum

Question 7

what part of the enamel epithelium will become ameloblast?

Answer 7

only the inner enamel epithelium

Question 8

what will the dental papilla become?

Answer 8

dental pulp and odontoblast

Question 9

odontoblast def

Answer 9

a cell of neural crest origin that is part of the outer surface of the dental pulp

-function: dentinogenesis (formation of dentin)

Question 10

what does the dental follicle give rise to?

Answer 10

cementoblasts (forms cementum)
periodontal ligament
alveolar bone proper

Question 11

OEE

Answer 11

outer enamel epithelium
- layer of cuboidal cells located on the periphery of the enamel organ in developing tooth

• seen in bell stage

Question 12

IEE

Answer 12

inner enamel epithelium
- layer of columnar cells located on the rim nearest the dental papilla of the enamel organ in a developing tooth

• first seen in cap stage

Question 13

stellate reticulum

Answer 13

group of cells located in the center of the enamel organ of developing tooth

Question 14

late cap stage

Answer 14

enamel knot is a transient structure involved in signaling and pattern formation of the cusps

teeth with more than one cusp have more than one enamel knot

Question 15

crown stage

Answer 15

increased amount of minerals
increase the size of crystals
maturation of crystals
completion of crown formation

Question 16

hypodontia

Answer 16

tooth loss except third molars

15% of peple

Question 17

oligodontia

Answer 17

loss of more than 6 missing teeth

0.1-1%

Question 18

anodontia

Answer 18

all teeth missing

exremely rare

Question 19

hyperdontia

Answer 19

supernumerary teeth