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DOH110 Oral Health sciences 1 > W7 Dentine + pulp > Flashcards

W7 Dentine + pulp Flashcards

1
Q

What is dentine?

A

Consists of large number of small parallel tubules in a mineralised collagen matrix. Odontoblasts are responsible for production of dentin

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2
Q

What physical properties does dentin have?

A
  • Pale yellow colour
  • Permeable
  • Higher degree of tensile and flexural strength than enamel
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3
Q

What are the chemical properties of dentin?

A

50% mineral
25% Water
25% organic

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4
Q

What dentin composed of?

A

Inorganic - hydroxyappatite minerals
Organic - collagen fibres
Water

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5
Q

What is composed in the organic matrix?

A

collagen fibers, proteins, dentine phosphoproteins, GLa-proteins, acidic proteins, growth factors, lipids

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6
Q

What is the inorganic matrix composed of?

A

Hydroxyappatite crystals, fluoride, strontium,

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7
Q

Where do Dentine Tubules run?

A

Run from pulpal surface to DEJ

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8
Q

What is the S curves?

A

Segmoid primary curvatures

  • Rootward convexity near the pulpal surface
  • Almost straight in the root and beneath the cusps
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9
Q

What is the Secondary Curvature?

A

Contour lines of Owen they coincide in adjacent tubules, branching and looping gives the granular layer of Tomes in the root

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10
Q

What is peritubular dentine?

A

Deposited by the processes on the walls and narrowing of the dentinal tubules, lacks collagenous fibrous matrix

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11
Q

Describe Odontoblasts and Processes

A

Become embedded in the ECM, elongates as the odontoblast moves toward pulp. It also stimulates differentiation of ameloblasts

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12
Q

What types of dentin present?

A

Primary
Secondary
Tertiary

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13
Q

Describe the function of primary dentine

A

Formed prior to eruption, deposited at DEJ, contains incremental lines. Contains: mantle dentine, circumpulpal dentine, globular dentine, peritubular, intertubular.

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14
Q

Describe the function of Secondary Dentine

A

Formed after completion of root formation, deposited more slowly than primary dentine, deposition leads to decreased of of pulp chamber

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15
Q

Describe the function of Tertiary dentine

A

Forms if dentine subjected to trauma, irritation, carious dentine, traumatic cavity prep.

  • Irritation
  • Irregular secondary
  • Reparative
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16
Q

Define Reactionary dentine

A

Tertiary - dentine forming in response to insult, damage, but exisiting cells recover

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17
Q

Define Reparative

A

Teritary - Dentine forming in response to an insult, original odontoblasts destroyed - produces tissue

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18
Q

What 3 layers of dentine are located in crown?

A
  • Mantle dentine
  • Interglobular dentine
    Circumpulpal dentine
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19
Q

What 3 layers are located in the root?

A

Hyaline layer
Granular layer of Tomes
Circumpulpal dentine

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20
Q

Define mantle dentin

A

First depositied around the dentinoenamel junction, lacks dentin sialoptotein in the mineralising ECM

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21
Q

Define Circumpilpal dentine

A

Layer of dentine around the outer pulpal wall, makes up bulk of tooth. Formed and matured after mantle dentin. In the crown its beneath matle and interglobular dentine
In the root: beneath the granular layer of Tomes

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22
Q

Define Globular Dentine

A

Between mantle and circumpulppal, only in the coronal portion of the tooth, the dentineis calcified following formation of the matrix and calcification occurs in small spherical space

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23
Q

Define peritubular

A

Immediately surrounds dentinal tubule, higher mineral content and lacks collagenous matrix

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24
Q

Define Intertubular

A

Forms bulk of dentine, around dentinal tubules of crown and root, less mineralised than peritubular

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25
Q

Define Hyaline layer

A

Most peripheral layer of initially unmineralised dentine, aids cemenum in binding to the dentin

26
Q

Define Granular layer of Tomes

A

In the root, just beneath the hyaline layer and cementum

27
Q

Whats the difference between interblobular dentine vs Tomes granular layer?

A

Seen in crown, and higher sulfur, Tomes seen in root, calcium + phosphorus

28
Q

What is predentine?

A

The inner most layer of dentin, thicker in young teeth, non-mineralised, secreted by odontoblasts via golgi apparatus, mitachondria

29
Q

What is translucent dentine?

A

Forms with aging due to tubules occlusion by peritubular dentine, pronounced at root apex

30
Q

Define Sclerotic dentine

A

Tubular occulsion by stimulus at site, tubules are completely obliterated. It is believed to be protective mechanisim to pulp

31
Q

What are dead tracts?

A

Odontoblastic processes killed by a stimulus, empty tubules

32
Q

What is the extent of odontoblast process?

A

Odontoblast dont go fully into the tubules, plays a role in dentine sensitivity

33
Q

What is deep dentine?

A

Secondary dentine - tubular surface area increase, difficult bonding to deep dentine

34
Q

What are incremental lines?

A

Lines of Von Ebner - cross striations across dentinal tubules
Controur lines of Owen - Follows a pattern, DEJ meet the accompanying striae of Retzius

35
Q

What lines are associated with primary curvatures?

A

Schreger lines

36
Q

What lines are associated with secondary curvatures?

A

Contour lines of owen

37
Q

What are the 3 pulps?

A

Coronal Pulp
Radicular Pulp
Apical Foramina and Accessory canals

38
Q

What is the coronal pulp?

A

Occupies crown of the tooth, larger than root pulp, pulp horns extend into cusps of tooth

39
Q

What is the Radicular Pulp?

A

Extends from cervical regions to apex

40
Q

What is the Apical Foramina & accessory canals?

A

Apical foramen: opening of root pulp into periodontium

Accessory canals may result from presence of blood vessels obstructing dentin formation

41
Q

What is pulp?

A

Soft specialised connective tissue loacted in the central portion of the tooth

42
Q

What is the function of the pulp?

A

Inductive
Formative
Protective/defence
Nutritive

43
Q

Describe Induction in the role of the pulp

A

In early development interacts with oral epithelium to initiate tooth formation

44
Q

Describe Formative in the role of the pulp

A

Odontoblasts from dentine

45
Q

Describe the roles of protection in pulp

A

Formation of reparative dentine, inflammatory response

46
Q

Describe Nutritive role of the pulp

A

Carries oxygen and nutrition to the tooth

47
Q

What is the composition of the pulp?

A

Connective tissue: Type 1 collagen fibres (ground substance, macromolecules and fluid
Cells: Mesenchymal cells (fibroblasts, macrophages, odontoblasts)
Neurons
Transient cells
Endothelial cells
Has no fat cells

48
Q

What is the Odontogenic Zone?

A

Odontoblast layer
Cell free zone
Cell rich zone
Central pulp

49
Q

Define the odontoblast layer

A

Outter most layer - Forms a single pseudostratified layer of cells attached to predentine surface

50
Q

Define Cell free zone?

A

Immediately beneath odontoblast layer

51
Q

Define Cell rich zone

A

Deep to cell free zone, high concentration of capillaries and exons, fibroblasts and mesenchymal cells

52
Q

Define central pulp

A

Bulk, and neurvascualar core

53
Q

Name 3 pulp cell types

A

Odontoblasts, Fibroblasts, Schwann cells, endothelia

54
Q

Define odontoblasts

A

They line perimeter of pulp from time they begin organizing to form dentin to the time they are no longer producing dentin at a rapid rate

55
Q

Define Fibroblasts

A

Are the most numerous cells in pulp, protein-producing cell, get smaller with aging

56
Q

Define Schwann cells and endothelial cells

A

SC form myelin sheath of nerves and associated with all pulp nerves
EC lines capillaries, veins and arteries of pulp

57
Q

What is the effect of restorative procedures?

A

Traumatic cavity prep, more rapid dentinogensis, growth factors incorporated into mineralized dentine matrix are released during carious invasion to induce dentinogenesis

58
Q

What are the dynamics of pulpodentine complex

A

Exposed fluid-filled tubules allow minute fluid shift across dentine in tactile, thermal, osmotic or evaporative stimuli - vitality test, thermal changes H/C

59
Q

What reaction occur ‘inwardly’ during cavity prep? (fluid shift)

A

Frictional head

  • Osmotic movement of cooling water
  • Heat generated due to LC
60
Q

What reaction occurs ‘outwardly’ during cavity prep? (fluid shift)

A

Evaporation by air cooling or air blow

Applying hypertonic conditioners, primers, bonding agents and varnishes

61
Q

What do fluid shifts create?

A

Pain in unanesthesized pulps
Local pulp inflammation under irritated tubules
Increases in tissue pressure
Alteration in pulpal blood flow

62
Q

Name disruption of odontoblastic layers

A

Restorative procedures
Deep prep can aspirate odontoblasts
Shallow preps distrupt junctional complexes between odontoblasts, by allowing large molecules to penetrate pulp, loss of cell signalling

DOH110 Oral Health sciences 1 (25 decks)

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