Odnotogenesis

Question 1

Two types of tissue

Answer 1

Oral epithelium (ectoderm)
Ectomesenchyme (mesoderm)

Question 2

The first development in development of the face is

Answer 2

Disintegration of the buccopharyngeal membrane

Question 3

Oral epithelium develops into

Answer 3

Dental Lamina

Question 4

Of odontogenesis begins

Answer 4

The 6th week of gestation

Question 5

Primary teeth form …… and permanent teeth form ……

Answer 5

4th month in utero

At birth

Question 6

What type of molecular interactions govern tooth development?

Answer 6

Intricate molecular interactions based on epithelial mesenchymal interactions

Question 7

What signifies the start of odontogenesis?

Answer 7

The appearance of basal lamina

Question 8

How is the primary epithelial band formed?

Answer 8

When horseshoe shaped epithelial cells (dental lamina) become surrounded by ectomesenchyme (NCC) and separated by basal lamina in the mand and max

Question 9

Adonia is associated with

Answer 9

Ectodermal dysplasia

Question 10

Most common problem in hyperdontia

Answer 10

Extra tooth in middle of max central incisors (mesioden)

Question 11

Stages of tooth development from beginning

Answer 11

Stomodeum, oral epithelium, dental lamina, BUD, CAP, BELL

Question 12

When does the bud stage begin?

Answer 12

After dental lamina incursion into the ectomesenchyme

Question 13

Primary teeth are considered

Answer 13

Placode said into the ectomesenchyme in the future sites of deciduous teeth

Question 14

Abnormalities during bud stage

Answer 14

Microdontia (max lat incisors and 3rd molars) and macrodontia (hemifacial hypertrophy)

Question 15

At what stage is the tooth a 3 layered enamel organ?

Answer 15

Cap (OEE, SR, IEE)

Question 16

What constitutes a tooth germ?

Answer 16

Enamel organ, dental papilla (ectomesenchyme more condensed), dental follicle (ectomesenchyme)

Question 17

What is dental papilla?

Answer 17

Condensation of ectomesenchyme located next to enamel organ but separated by basement membrane

Question 18

Peripheral cells in dental papilla differentiate into what?

Answer 18

Odontoblasts secrete dentin

Question 19

How is the dental follicle different than the dental papilla?

Answer 19

Less cellular, more fibrous (collagen)

Question 20

What do dental follicle cells do?

Answer 20

Inner - near enamel, become cementocytes

Outer - form PDL (periodontal ligament) and attribute to bone formation

Question 21

5 layers in the cap stage?

Answer 21

Dental lamina, enamel organ, dental papilla, dental follicle, succedaneous dental lamina

Question 22

When do accessional teeth form?

Answer 22

5th month of gestation

Question 23

Abnormalities in cap

Answer 23

Dens in dente, fusion (less teeth), germination (correct teeth)

Question 24

What happens in bell stage?

Answer 24

Morphodifferentiation (shape)

Histodifferentiation (amelo/odontoblasts)

Question 25

Stellate reticulum

Answer 25

Center of enamel organ

Draws water to transport nutrients and calcium

Question 26

Stellate intermediate

Answer 26

Assists in producing enamel by transferring phosphates from blood vessel

Question 27

IEE

Answer 27

Inner enamel epithelia - forms ameloblasts

Question 28

In the bell stage, the basal lamina becomes

Answer 28

the DEJ between the IEE and the dental papilla

Question 29

OEE

Answer 29

Outer enamel epithelium - work with IEE to form the cervical loop

Question 30

What is the cervical loop?

Answer 30

Where IEE and OEE meet. Also Hertwigs epithelial root sheath = development of the root

Question 31

Two important events in bell stage?

Answer 31

Dental lamina disintegrates - separates developing tooth from oral epithlium
The crown pattern and cusps develop due to folding of the IEE

Question 32

What a epithelial pearls?

Answer 32

Clusters of epithelial cells/fragmentation of the dental lamina that can be phagocytosed or form into cysts

Question 33

Layer of skin for the face

Answer 33

Ectoderm