dental development 1

Question 1

what are the 3 primary embryonic layers?

Answer 1

ecotderm, endoderm, mesoderm

Question 2

what is the 4th additional layer? where does it form from?

Answer 2

ectomesenchyme / neural crest.

formed from between the ectoderm and neural tube

Question 3

which part of the tooth germ and tissue origin is enamel formed from?

Answer 3

enamel is formed from the ectoderm

Question 4

which part of the tooth germ and tissue origin are dentine and pulp formed from?

Answer 4

dentine and pulp are formed from the ectomesenchyme / neural crest.

Question 5

which part of the tooth germ and tissue origin is the cementum, PDL and part of the alveolar bone formed from?

Answer 5

these are formed from the ectomesenchyme / neural crest

Question 6

what clinical implications can incorrect migration of ectomesenchyme cells cause?

Answer 6

mandibulofacial dysostosis

• causes facial deformity
• underdeveloped ears
• mandible and maxilla too small compared to facial structure

Question 7

how does the permanent tooth germ develop and at what time?

Answer 7

extension on the lingual side of dental lamina

new lamina for a permanent successor.

Question 8

what is the dental lamina?

Answer 8

band of epithelial tissue in developing tooth

proliferates into underlying ectomesenchyme and forms U shaped band along future arches of jaw

Question 9

what is the bud stage