Week 9 - Tooth Development Flashcards
How many teeth are there in a primary dentition
20
How many teeth are there in a permanent dentition
32
What is the anatomically distinct unit where each tooth develops from
tooth germ
Where do permanent molars develop in comparison to the deciduous
distal
where do permanent successors develop in comparison to the deciduous buds
lingual
What are the 2 tissues which teeth develop from
epithelium and ecto-mesenchyme
Where is epithelium derived from
ectoderm
where is ecto-mesenchyme derived form
neural crest cells
What in the tooth germ does the ectoderm eventually form
enamel organ
What does the enamel organ eventually form
enamel
What does the ectomesenchyme form in the tooth germ
dental follicle and dental papilla
what does the dental follicle form
cementum
periodontal ligament
alveolar bone
what does the dental papilla form
dental pulp
What comprises the tooth germ
enamel organ
dental follicle
dental papilla
What are the 3 stages of tooth development
- Bud stage
- Cap stage
- Bell stage
When does pre tooth development occur
6th week
What occurs in pre tooth development
primary epithelial band forms which corresponds to the position of the future upper and lower jaws
In week 7 of fetal development this primary epithelial band will bifurcate into a lingual process called the dental lamina and a buccal vestibular lamina.
What occurs in the bud stage
- The dental lamina proliferates and takes the shape of a bud which is referred to as the enamel organ
- During this there is also a dense condensation of ecto-mesenchymal cells around the bud