Module 9

Question 1

Tooth initiation begins at the ___ week in utero, when the ________ cells build up immediately under the oral epithelium.

Answer 1

4th; ectomesenchymal

Question 2

The oral epithelium proliferates down into the ectomesenchyme to form a ______________.

Answer 2

Primary epithelial band

Question 3

At the 7th week, the primary epithelial band differentiates into the _______ and ______ laminae

Answer 3

Vestibular and Dental

Question 4

These are epithelial swellings within the dental lamina, in which there are 10 in each jaw.

Answer 4

Dental buds

Question 5

In this stage, the enamel organ forms into cap surrounding mass of dental papilla from the mesynchyme and is surrounded by a mass of dental sac.

Answer 5

Cap stage

Question 6

The formation of the tooth germ begins in this stage.

Answer 6

Cap stage

Question 7

This tooth germ forms a cap shape with deep cervical depression; will give rise to the tooth enamel.

Answer 7

Enamel organ

Question 8

This tooth germ ie the condense mass mesenchyme within the concavity if the enamel organ; gives rise to the dentin and the pulp.

Answer 8

Dental papilla

Question 9

This tooth germ is a condensed mass if mesenchyme surrounding the enamel organ and gives rise to the cementum, PDL, and alveolar bone.

Answer 9

Dental sac/ follicle

Question 10

Increasing amount of collagen fibers forming around the enamel organ.

Answer 10

Dental sac/ follicle

Question 11

A cell layer of the tooth germ that has outer cuboidal cells of the enamel organ.

Answer 11

Outer Enamel Epithelium (OEE)

Question 12

Star shaped cells in the many layers forming a network inside the enamel organ; supports the production of the enamel matrix.

Answer 12

Stellate Reticulum

Question 13

Inner compressed layer of flat to cuboidal cells; supports the production of the enamel matrix.

Answer 13

Stratum Intermedium

Question 14

The innermost tall columnar cells of the enamel organ; will differentiate into ameloblasts that will form enamel matrix.

Answer 14

Inner Enamel Epithelium (IEE)

Question 15

Outer layer if cells of the dental papilla nearest the IEE of the enamel organ.

Answer 15

Outer Cells of the Dental Papilla

Question 16

Has a basement membrane (membrana performativa); will differentiate into odontoblasts that will form the dental matrix.

Answer 16

Outer Cells of the Dental Papilla

Question 17

Inner mass cells of the dental papilla; will differentiate into the pulp.

Answer 17

Inner Cells of the Dental Papilla

Question 18

In this stage, the outer cells of the dental papilla are induced by the preameloblasts to differentiate into odontoblasts.

Answer 18

Apposition stage

Question 19

True or false: The odontoblats therefore start their secretory activity some time before the enamel matrix begins.

Answer 19

True

Question 20

With the contact between the predentin and the enamel matrix formed, the disintegrating membrane mineralised forming the ______.

Answer 20

Dentinoenamel junction (DEJ)