Odontogenesis

Question 1

Cell types used in the formation of teeth

Answer 1

Ectoderm
Mesoderm
Endoderm
Neural crest cells

Question 2

Brief overview of the 6 stages of tooth development

Answer 2

1.Initiation stage- dental lamina is formed.
2.Bud stage- from the dental lamina will be 10 tooth buds forming.
3. Cap stage- the bud stage will then develop to the cap stage
4.Bell stage- from cap stage then the early bell stage and late bell stage
5. Appositional stage- dental hard tissues are form.
6. Maturation & eruption into the oral cavity.

Question 3

Initiation stage

Answer 3

From the oral epithelium the odontogenic epithelium in the maxillary and mandibular will start to proliferate and form the dental lamina.
The primary epithelium band will form 2 bands - the dental band and the vestibular band.
The cells in the vestibule will disintegrate and thats what forms the vestibular around the oral cavity.

Question 4

Bud stage

Answer 4

Outgrowths will happen into the from the dental lamina to the underlying ectomesenchyme.
Determination of specific tooth type and their correct position in jaws.
The tooth bud is formed by ectoderm.
The tissues around it are formed by ectomesenchyme

Question 5

3. Cap stage

Answer 5

-Enamel is formed by ectoderm.
-Dental papilla is condensed ectomesenchyme cells within the concavity forms dentine and dental pulp.
-Dental follicle form dento-alveolar articulation.

Question 6

4. Bell stage

Answer 6

Early bell stage-
4 different types of cells develop in enamel organ.
Outer enamel epithelium- protective layer to enamel organ.
Stellate reticulum- support future production of enamel.
Stratum intermedium- Support future production of enamel.
Inner- enamel epithelium- low columner cells will differnetiate into ameloblasts to later form enamel.

Late bell stage-
Dental lamina will fragment.
Tooth crown completes final shape.