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Endodontics > The Pulp-Dentin Complex > Flashcards

The Pulp-Dentin Complex Flashcards

1
Q

Four zones in pulp

A

-Odontoblast layer
-Cell poor zone of weil
-Cell rich zone
-pulp proper

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2
Q

Which layer of pulp produces dentin

A

Odontoblastic layer

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3
Q

Crown and root difference in dentinal tubules

A

Crown has more dentinal tubule and larger diameter
Root has less dentinal tubules and smaller diameter

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4
Q

What is present in cell free zone

A

Capillaries and unmyelinated nerve fibers passing

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5
Q

What happens when odontoblasts die during mechanical injury or caries

A

Undifferentiated mesenchymal cells from cell rich zone migrate to pulp dentin junction and differentiate into odontoblasts

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6
Q

Most numerous cells in pulp

A

Fibroblasts

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7
Q

Most numerous immune cells in pulp

A

Dendritic cells

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8
Q

Cells only found in inflammed pulp

A

B lymphocytes and mast cells

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9
Q

Extracellular matrix of pulp is made of

A

Glycoproteins
Proteoglycans
Glycosaminoglycans
Amorphous
Gel like
Supports cell

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10
Q

During inflammation extracellular matrix is degraded by

A

Inflammatory mediators and lipopolysaccharides

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11
Q

Difference of collagen concentration throughout the pulp

A

Apical portion of pulp contains more collagen than coronal portion

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12
Q

What stage does sensory nerve fibers appear in teeth

A

Bell stage

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13
Q

Which nerve fibers appear first

A

Unmyelinated C fibers

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14
Q

Only sympathetic fibers in pulp

A

Modulates circulation

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15
Q

When pt is having symptoms of reversible pulpitis it is by which nerve fiber

A

A delta it is present in pulp dentin junction. Cavity doesn’t have to be very deep to feel the pain

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16
Q

Irreversible pulpitis is noticed due to which nerve fibers

A

C fiber present throughout pulp, deep throbbing pain and has relatively deep caries

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17
Q

Nerve fibers in pulp are

A

Nociceptive

18
Q

Pulpal pain is poorly localized because

A

Pulp does not contain propriocepters and single neuron may innervate more than one tooth

19
Q

What happens to A delta fibers beneath cell rich zone

A

A delta fibers loose their myelin sheath and divide and form plexus- nerve plexus of Raschkow

20
Q

Why does pt feel pain when lying down if pulp inflammed

A

Blood flow and pressure increases towards head when pt lies down that causes excessive pressure

21
Q

Main inorganic component of dentin

A

Calcium hydroxyapatite

22
Q

What type of collagen in dentin

A

Because it is produced by odontoblasts type I and minor amount of type III

23
Q

What allows for impact of mastication to occur without fracturing enamel

A

The elasticity of dentin provides flexibility and works as shock absorber

24
Q

Radiopacity of enamel dentin and bone

A

Enamel>dentin>bone

25
Q

Diameters of dentinal tubule near pulp and at DEJ

A

Diameter of dentinal tubule is wider near pulp and narrower near DEJ

26
Q

Peritubular dentin

A

Highly mineralized, less collagen

27
Q

Predentin

A

First deposited unmineralized dentin, 10 to 50 micrometers and lines at innermost portion

28
Q

Dentin mineralization can occur by which patterns

A

Globular or linear

29
Q

Which type of calcification is rapid

A

Globular calcification pattern

30
Q

Globular calcification seen in

A

Mantle dentin

31
Q

The unmineralized dentin between the mineralized globules is called

A

Interglobular dentin

32
Q

Which type of calcification is uniform

A

Linear and slow rate

33
Q

Oldest dentin

A

Close to enamel/DEJ- mantle or primary dentin, fast rate, globular
Newest dentin- closer to pulp, secondary, slower rate, linear- lines of owen

34
Q

Which area of the tooth is very sensitive

A

Close to DEJ because of profuse branching of dentinal tubules

35
Q

Which dentin forms most of the floor and roof of pulp chamber

A

Secondary

36
Q

Collagen fibers in dentin

A

Perpendicular to DEJ

37
Q

2 types of tertiary dentin

A

Reactionary
Reparative

38
Q

Continued deposition of peritubular dentin or mineralization of contents causes

A

Sclerotic dentin

39
Q

Physiologic and pathologic dentin

A

Physiologic- primary, secondary, sclerotic
Pathologic- teriary

40
Q

Pulp stones more commonly found in

A

Orifice or within root canal

Endodontics (2 decks)

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