Odontogenesis 1

Question 1

What are the mineralised dental tissues?

Answer 1

Enamel, dentine, and cementum

Question 2

What are the unmineralized dental tissues?

Answer 2

Dental pulp and periodontium

Question 3

Initiation stage

Answer 3

first stage of tooth development

Question 4

bud stage

Answer 4

Second stage simple, spherical to avoid, epithelial condensation poorly morpho differentiated and histodifferentiated

Question 5

Cap stage

Answer 5

third stage of tooth development, in which the tooth germ grows into cap shape

Question 6

Bell stage

Answer 6

fourth stage, in which differentiation occurs to its furthest extent and starts to resemble a bell

Question 7

Crown stage

Answer 7

Some textbooks count as a stage-some call it late bell stage. This is when the tooth is fully developed

Question 8

External enamel epithelium

Answer 8

Outer layer of cuboidal cells that limits the enamel organ

Question 9

Stellate reticulum

Answer 9

epithelial origin but behave like mesenchymal cells - synthesis of Collagen I, II, and III

Question 10

Stratum intermedium

Answer 10

Two or three layers of cells sitting above IEE. Express Alkaline phosphatase like SR but not IEE

Question 11

Inner enamel epithelium

Answer 11

Columnar shaped cells rich in RNA. Connected by desmosomes to each other

Question 12

Before tooth development what does the epithelial band do?

Answer 12

Pushes down triggering condensation of mesenchyme in response to growth factor 8 to give rise to the dental lamina and vestibular lamina

Question 13

What happens at week 8

Answer 13

There is also the bud starting to grow in the dental lamina, and by week 9 the ectomesenchyme has differentiated to start tooth development on the bud

Question 14

Interactions between epithelium (ectoderm) gives rise to ?

Answer 14

Enamel and Hyaline layer of the root

Question 15

Interactions between mesenchyme (ectomesenchyme) give rise to?

Answer 15

Dentine, pulp, cementum and periodontium (PDL and bone)

Question 16

what does the dental papilla do?

Answer 16

Forms odontoblasts (dentine) and pulp

Question 17

What does the dental follicle do?

Answer 17

Forms the cementum. PDL and bone

Question 18

Role of inner enamel epithelium

Answer 18

Forms ameloblasts > enamel

Question 19

Role of stratum intermedium

Answer 19

Synthesis and transport to and from IEE

Question 20

Role of stellate reticulum

Answer 20

Maintenance of shape and protection

Question 21

Role of outer enamel epithelium

Answer 21

Maintenance of shape and exchange

Question 22

Enamel knot

Answer 22

Signalling centres

Question 23

Enamel niche

Answer 23

A hole or depression in the dental epithelium

Question 24

Enamel septum

Answer 24

Aids change in shape from cap to bell

Question 25

Timeline

Answer 25

Week 8 - bud stage
Week 11 - cap stage
Week 14 - Bell stage
Week 17 - late bell stage