Chp 5

Question 1

Species with two types of dentition are called

Answer 1

diphyodont

Question 2

Differentiation of the teeth takes place in which stage

Answer 2

bell stage

Question 3

teeth develop from these cells

Answer 3

ectodermal cells and mesenchymal cells and neural crest cells

Question 4

what cells form the enamel organ

Answer 4

ectodermal cells

Question 5

what cells form dental papilla

Answer 5

mesenchymal

Question 6

what does dentin form from

Answer 6

dental papilla and mesenchymal cells

Question 7

Name the stages of tooth development in order (Fig 5.1)

Answer 7

1. Bud
2. Cap
3. Bell
4. Dentinogenesis
5. Amelogenesis
6. Crown formation
7. Root formation and eruption
8. Function

Question 8

ECTODERMAL cells form what

Answer 8

ENAMEL ORGAN → ENAMEL

Question 9

MESENCYMAL cells form

Answer 9

DENTAL PAPILLA → DENTIN AND PULP

Question 10

What is the 1st sign of tooth formation

Answer 10

Proliferation of ectodermal cells development of dental lamina

Question 11

Dental Lamina is a

Answer 11

sheet of epithelial cells

Question 12

BUD

Answer 12

Bud looks like a round localized shape of ectodermal cells surrounded by mesenchymal cells.
1st stage when ectodermal and mesenchymal start to interact

Question 13

CAP

Answer 13

The cells enlarges
Differentiation occurs. The ectodermal becomes the enamel organ and the mesenchyme forms the dental papilla.
Dental follicle

Question 14

BELL

Answer 14

The enamel organ and the papilla start to morphodifferentiation (structure changes) and histodifferentiation (histology cells changes)

Question 15

What changes happen in the bell stage

Answer 15

The enamel organ has split and formed the outer enamel epithelia cells and inner epithelial cells.
Layer develop in between
The dental papilla becomes odontoblasts. Theses odontoblast cells produce dentin.
(the rest of the papilla will turn into the tooths pulp)

Question 16

What cells bring nutrients to ameloblast

Answer 16

Outer enamel epithelium

Question 17

Cells that assist in ameloblast formation

Answer 17

Stratum intermedium

Question 18

What cells develop ameloblasts

Answer 18

Inner epithelial cells

Question 19

Layers that have developed in the enamel organ

Answer 19

Outer enamel epithelium
Stellate reticulum
Stratum intermedium
Inner epithelial cells

Question 20

This is the process of developing the dentin in the tooth.

Answer 20

DENTINOGENESIS

Question 21

Dentinogenesis

Answer 21

The odontoblast processes (a process is an elongated cell) move down into the pulp area up to the DEJ
Odontoblast starts to form a matrix of collagen fibers and processes secretes proteins. This matrix is called Pre-dentin. It starts to calcify in 24 hrs called DENTIN.

Question 22

When the ameloblasts are secreting, there are short conical processes that develop called

Answer 22

Tomes process

Question 23

Formation of the enamel stage takes place during

Answer 23

Amelogenesis

Question 24

The inner epithelium cells elongate and become ameloblasts that secrete thru the 5 stages takes place during what stage

Answer 24

Amelogenesis

Question 25

Starts at the DEJ takes place at what stage

Answer 25

Amelogenesis

Question 26

The inner layer of the enamel organs are secreting now. What keeps the layers together is the desmosomes. Takes place during what stage

Answer 26

Amelogenesis

Question 27

What layer brings nutrients in during amelogenesis formation Once it arrives the protein ________ is produced.

Answer 27

outer layer | amelogenin

Question 28

the tooth matrix begins to mineralize when

Answer 28

As amelogenesis is completed and amelogenin is deposited

Question 29

in what order is the enamel laid down in layers

Answer 29

From the DEJ to the tips of the cusp to the lateral sides of the crown the enamel

Question 30

The enamel matures. The mature protein is called

Answer 30

enamelin

Question 31

What stage does the enamel mature

Answer 31

amelogenesis

Question 32

During what phase is the fluid removed for mineralization. Now hard enamel!

Answer 32

Maturation phase during amelogenesis

Question 33

As the crown develops, the inner and outer epithelial cells fuses to become a double layer cells root sheath aka ______

Answer 33

HERS

Question 34

As the root forms the outer root sheath develops -→

Answer 34

cementumns

Question 35

As the cells proliferated, the root sheath bends at

Answer 35

a 45 deg angle

Question 36

The root lengthens at the same rate as

Answer 36

as tooth eruption

Question 37

What stage do roots lengthen and root sheath develops into cementum

Answer 37

tooth rooth

Question 38

every root bends

Answer 38

distally

Question 39

what stages happen simultaneously

Answer 39

crown formation | root formation

Question 40

follicle is made of what kind of cells

Answer 40

mesenchymal

Question 41

when do primary teeth develop

Answer 41

in utero

Question 42

when do permanent teeth start develop

Answer 42

after birth

Question 43

What cells migrate to form the alveolar bone and the periodontal ligament.

Answer 43

mesenchymal cells from the dental follicle

Question 44

The dental follicle helps make

Answer 44

helps make collagen producing fibroblast. These fibroblast generates fibers.

Question 45

The PDL is made up of

Answer 45

fibroblast follicles

Question 46

As the tooth develops the ______ does also.

Answer 46

alveolar bone

Question 47

Loss of teeth =

Answer 47

loss of bone