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HISTOLOGY > Dentine and Pulp > Flashcards

Dentine and Pulp Flashcards

1
Q

What is dentine?

A

bone like material w/ protein matrix

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2
Q

what is amelo-dentinal junction?

A

where dentine and enamel of crown meet

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3
Q

what happens to pulp with age?

A

It shrinks

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4
Q

What are the properties of dentine?

A
  • harder than bone
  • elastic not brittle
  • yellow
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5
Q

what are the chemical properties of dentine?

A

65% inorganic mineral

35% organic= collagen/ proteoglycans/ glycoproteins/h20

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6
Q

What is the structure of Dentine?

A

HAP crystal

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7
Q

how are HAP crystals arranged?

A

parallel to collagen fibrils

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8
Q

What are dentinal tubules?

A

channels via dentine from pulp to outer dentine

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9
Q

what do tubules contain?

A

fluid and odontoblast

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10
Q

what is odontoblast?

A

outer surface of dentine that FORM dentine

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11
Q

What is curvature of Tubules?

A

S shape w/ wave deviations

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12
Q

when are tubules branches increased?

A

ADJ

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13
Q

What happens at ADJ?

A

enamel more mineralised than dentine

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14
Q

Where are tubules wider?

A

at Pulp end than ADJ end

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15
Q

what are tubules adjacent to?

A

enamel in crown and cementum in root

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16
Q

What is peritubular dentine?

A

deposited by odontoblast process

- dentine hypermineralised

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17
Q

What does larger Dentine surface area mean?

A

tubules more packed at pulpal surface

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18
Q

what happens to curvature as down root?

A

less curved

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19
Q

What are daily incremental lines of Dentine?

A

Von Ebner lines

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20
Q

how much is dentine laid down a day?

A

4um

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21
Q

what is superimposed on Von Ebner lines?

A

Andresen lines

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22
Q

What other lines are on dentine?

A

Contour lines of owen

Schreger lines

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23
Q

What are 3 types of dentine based on region?

A

1) Mantle and circumpulpal
2) Primary and regular secondary
3) peritubular and intertubular

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24
Q

What are 3 specific types of dentine

A

1) Irregular secondary/ tertiary or reparative
2) Dead tract
3) Sclerotic

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25
Q

What is mantle dentine?

A

directly under enamel

26
Q

what is circumpulpal dentine?

A

housing primary and regular secondary dentine but mantle

27
Q

What is most rapidly formed dentine?

A

Primary dentine - formed at initial tooth development

28
Q

when is secondary formed?

A

slowly over life of tooth

29
Q

what happens at junction between primary and secondary dentine?

A

tubules change direction

30
Q

What is peritubular dentine?

A

tubules filled with Hypermineralised, non collagenous dentine

31
Q

What is intertubular dentine?

A

material between tubules - collagenous matrix

32
Q

What is Sclerotic dentine?

A

tubules translucent when filled with peritubular dentine

33
Q

Why is peritubular dentine laid down?

A
  • Defensive response by odontoblasts to caries/trauma

- tooth ages, more older more translucent

34
Q

What is defensive response of odontoblast?

A

peritubular dentine laid down to block tubule so acid/bacteria can’t reach pulp

35
Q

What is irregular secondary dentine?

A

laid down at Pulpal surface when caries too fast so it inc. thickness of dentine

36
Q

What are 2 types of irregular secondary dentine?

A

1) reparative

2) Reactionary

37
Q

What is Reactionary dentine?

A

made by surviving odontoblasts that make 2ndary dent.

38
Q

What is Reparative Dentine?

A

when Osteoblasts differentiate and lay dentine at pulpal surface

39
Q

How are Dead tracts formed?

A

when odontoblasts die so tubules fill w/ air or debris

40
Q

How does Predentine mineralise?

A
  • mineral crystals added to mineralisation front

- Calcospherites fuses with front

41
Q

What are calcospherites ?

A

spheres of calcification

42
Q

what is predentine?

A

Type 1 collagen and non collagenous proteins

43
Q

what is found in predentine layer?

A

Odontoblasts which secrete matrix

44
Q

where is cell free zone?

A

beneath odontoblasts

45
Q

What are Odontoblasts?

A

thin cells w/ nucleus and RER

- tubules have odontoblasts that protrude into pre dentine

46
Q

What is interglobular dentine?

A

when calcospherites fuse w/ each other before mineralisation front advances

47
Q

what results due to interglobular dentine

A

area of matrix hypomineralised trapped in dentine

48
Q

What is granular layer of tomes?

A

between PDL & dentine , is interglobular dentine

49
Q

How is the PULP vascularised and innervated?

A

nerves/vessels enter via Apical foramen (apex)

50
Q

What is formed in pulp

A

vascular plexus beneath/between odontoblasts

51
Q

What is the main cell in pulp?

A

Fibroblasts

52
Q

What is plexus of nerves in pulp?

A

Raschkow’s plexus- nerves travel around odontoblast and some into them

53
Q

How is dentine Sensitive?

A

1) Direct innervation
2) Odontoblasts
3) Hydrodynamics

54
Q

What is direct innervation of dentine?

A

stimulus> response in nerve at dentine> impulse to raschkows plexus to CNS

55
Q

What is odontoblast innervation mechanism?

A

response in odont> impulse to odont. cell body where synapse to nerve plexus

56
Q

What is hydrodynamic mechanism of innervation?

A

stimulus> fluid flow in tubule> response in nerve ending within tubules or between odontoblasts

57
Q

what is the most sensitive region of dentine?

A

outmost part underneath enamel or cementum

58
Q

Why is hydrodynamics most likely mechanism for innervation?

A

tubules get thinner as run through pulp so fluid flow at faster rate so greater stimulus & sensitivity

59
Q

How do anti sensitivity toothpastes work?

A

deposit mineral in tubules and occlude them so no fluid flow

60
Q

what happens to pulp with age?

A

pulp stone and denticles within pulp tissue or on pulp wall

HISTOLOGY (5 decks)

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