Embryology And Development

Front 1

Define endochondral ossification

Back 1

Cartilage which is replaced by bone

Front 2

Define intra-membranous ossification

Back 2

Formation of bone from fibrous connective tissue

Front 3

What structure do the lateral palatal shelves form?

Back 3

Maxillary process

Front 4

At what age do palatine shelves form?

Back 4

6 weeks IU

Front 5

Name 5 sutures present in foetal skull

Back 5

Frontal, Sagittal, lambdoidal, coronal, squamousal

Hint 5

Me

Front 6

Name 5 sutures present in foetal skull

Back 6

Frontal, Sagittal, lambdoidal, coronal, squamousal

Hint 6

Me

Front 7

Describe the embryo at three weeks of IU

Back 7

Flat trilaminar discs, consisting of 3 layers

Front 8

Name 5 sutures present in foetal skull

Back 8

Frontal, Sagittal, lambdoidal, coronal, squamousal

Hint 8

Me

Front 9

Describe the embryo at three weeks of IU

Back 9

Flat trilaminar discs, consisting of 3 layers

Front 10

What age does facial development begin?

Back 10

3 IU

Front 11

At what stage does the dental lamina grow posteriorly to form the buds for secondary molar teeth?

Back 11

Late bell

Front 12

At what stage does the dental lamina grow posteriorly to form the buds for secondary molar teeth?

Back 12

Late bell

Front 13

At what stage is dentine first layed down?

Back 13

Cap

Front 14

At what stage does the dental lamina grow posteriorly to form the buds for secondary molar teeth?

Back 14

Late bell

Front 15

At what stage is dentine first layed down?

Back 15

Cap

Front 16

What stage do stimulated ameloblasts lay down enamel?

Back 16

Bell

Front 17

What is the function of stratum inter medium?

Back 17

Protein synthesis. Transport of materials to/ from the ameloblasts

Front 18

What's the name for the mesenchyme surrounding the tooth germ?

Back 18

Dental follicle

Front 19

What are the 3 stages of tooth development?

Back 19

Initiation

Morphogenesis

Histogenesis

Front 20

the oral epithelium thickens and invaginates into mesenchyme - what does this form?

Back 20

Primary epithelial band

Front 21

What is present at 6 weeks IU?

Back 21

Dental laminar

Tongue

Meckels cartilage

Front 22

What is present at 6 weeks IU?

Back 22

Dental laminar

Tongue

Meckels cartilage

Front 23

What's present at 7 weeks IU?

Back 23

Dental laminar

Vestibular laminar

Tooth bud

Ectomesenchyme

Tongue

Meckels cartilage

Bone

Front 24

What are tooth germs?

Back 24

Swellings that begin to develop on the deep surface of dental lamina.

They are a collection of cells who's functions are to form the dental tissues

Front 25

What maps out the occlusal pattern of the teeth?

Back 25

Configuration of the IEE (14th week)

Front 26

When does the stratum intermedium fist appear?

Back 26

Bell stage

Front 27

When does the stratum intermedium fist appear?

Back 27

Bell stage

Front 28

what does the SI consist of?

Back 28

2-3 layers of flattened cells

Front 29

What type of cells is the IEE made from ?

Back 29

Cuboidal > columnar

Columnar at bell stage

Front 30

What type of cells is the IEE made from ?

Back 30

Cuboidal > columnar

Columnar at bell stage

Front 31

What is late bell stage associated with?

Back 31

Formation of hard tissues

Front 32

When does the dental lamina grow backwards from the second pre primary molar to make room for permanent molar teeth ?

Back 32

18th week IU

Front 33

When does the dental lamina grow backwards from the second pre primary molar to make room for permanent molar teeth ?

Back 33

18th week IU

Front 34

What is formed at late bell?

Back 34

Dentine

Triggers enamel lay down

Front 35

What is the inner lining of the bell compose of?

Back 35

Odontoblasts

Front 36

What is the inner lining of the bell compose of?

Back 36

Odontoblasts

Front 37

What does the out surface of the bell consist of?

Back 37

Ameloblasts

Front 38

What is the inner lining of the bell compose of?

Back 38

Odontoblasts

Front 39

What does the out surface of the bell consist of?

Back 39

Ameloblasts

Front 40

What happens at the late bell stage to the ameloblasts?

Back 40

They migrate outwards to create/ form the crystalline enamel of the tooth

Front 41

What happens to the Odontoblasts at this stage?

Back 41

The migrate inwards to form tubular dentine (like the pulp)

Front 42

What happens when to tooth erupts in the mouth?

Back 42

Ameloblasts de shed

IEE and OEE join downwards (hurts tooth sheath)

Front 43

What happens when to tooth erupts in the mouth?

Back 43

Ameloblasts de shed

IEE and OEE join downwards (hurts tooth sheath)

Front 44

When the tooth erupts in the mouth what happens to the apex?

Back 44

Tooth is still forming, apex is open.

Front 45

What happens when to tooth erupts in the mouth?

Back 45

Ameloblasts de shed

IEE and OEE join downwards (hurts tooth sheath)

Front 46

When the tooth erupts in the mouth what happens to the apex?

Back 46

Tooth is still forming, apex is open.

Front 47

What age does the apex close?

Back 47

2 years after eruption (primary and secondary)

Front 48

What happens when to tooth erupts in the mouth?

Back 48

Ameloblasts de shed

IEE and OEE join downwards (hurts tooth sheath)

Front 49

When the tooth erupts in the mouth what happens to the apex?

Back 49

Tooth is still forming, apex is open.

Front 50

What age does the apex close?

Back 50

2 years after eruption (primary and secondary)

Front 51

What happens to the Odontoblasts are eruption?

Back 51

They maintain in the tooth, lining the pulp chamber, acting as circulation for dentine

Front 52

Match the cells listed to the tissues they are found in:

Cementocytes

Back 52

Cementum

Front 53

What is the brannstorms hydrodynamic theory?

Back 53

Movement of fluid within the dental tubules

*most widely accepted**

Front 54

What does this show?

Back 54

-Enamel shows attrition and wear,

-Dentine develops dead tract below the areas of wear

-Pulp shrinks

-Secondary dentine is laid down

-Cells in pulp decrease

-Vascularity of pulp decreases

-Cementum becomes thicker at apex

Front 55

Location of Fibres

Midroot to adjacent alveolar bone

Back 55

Horizontal fibres

Front 56

Cervical root to alveolar crest

Back 56

Alveolar crest fibres

Front 57

Continuous around neck of tooth

Back 57

Circumferential fibres

Front 58

Between the roots of the alveolar bone

Back 58

Interradicular

Front 59

Apical one their of the root to adjacent alveolar bone

Back 59

Oblique

Front 60

Cervical tooth (neck of the tooth) to tooth medial or distal to it

Back 60

Transeptal fibres

Front 61

Ondontoblasts

Back 61

Pulp

Front 62

Osteoblasts

Back 62

Bone

Front 63

What does this show?

Back 63

-Enamel shows attrition and wear,

-Dentine develops dead tract below the areas of wear

-Pulp shrinks

-Secondary dentine is laid down

-Cells in pulp decrease

-Vascularity of pulp decreases

-Cementum becomes thicker at apex

Front 64

Osteoclasts

Back 64

Alveolar bone

Front 65

Fibroblasts

Back 65

Periodontal ligament

Front 66

How much of acellular and cellular cementum covers the root surface ?

Back 66

Acellular - 2/3

Cellular - 1/3

Front 67

The apex of the root is thicker and made up of cellular cementum, true of false?

Back 67

True

Front 68

What is the innervation theory?

Back 68

Nerve fibres of pulp pass into dentinal tubules

Front 69

What is the Odontoblast receptor theory?

Back 69

Cells responsible for dentinal tubules act as receptors transmitting nerve impulses