Dentin and Pulp Flashcards

1
Q

Describe dentin

A

less hard than enamel, smaller crystals
Makes up bulk of tooth***
Yellow color reflected through enamel
More radiolucent than enamel, more radiopaque than pulp

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2
Q

Attrition

A

*more rapid when dentin is exposed

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3
Q

How does apposition of dentin matrix occur?

A

predentin produces initial dentin matrix, laid down by odontoblasts (outer cells of dental papilla)
apposition of dentin occurs during life of tooth

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4
Q

Mineralization/maturation of predentin occurs in how many stages?

A

2; primary and secondary

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5
Q

Primary maturation

A

hydroxyapatite form globules in collagen fibers of the dentin, allows for expansion and fusion of crystals

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6
Q

Secondary maturation

A

new areas of mineralization as globes form in partially mineralized predentin, new crystals regularly layered allow them to expand, but fuse incompletely

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7
Q

Globular dentin

A

complete crystalline fusion in both phases, light rounded areas

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8
Q

Interglobular dentin

A

incomplete fusion, only mineralized in primary phase, slightly less mineralized, dark arc like areas

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9
Q

Where is interglobular dentin found?

A

coronal dentin near DEJ
when in root, known as Tome’s Granular Layer*

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10
Q

What do dentinal tubules contain?

A

odontoblastic process, fluid, afferent nerve axon
provides nutrition since dentin is avascular

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11
Q

Primary curvature of dentinal tubules

A

overall tubule course over time, resembles S shaped curve

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12
Q

Secondary curvature of dentinal tubules

A

smaller, delicate curves noting daily changes of odontoblast direction during apposition

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13
Q

Peritubular dentin

A

halo effect, creates walls of tubules, highly mineralized

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14
Q

Intertubular dentin

A

between tubules, less mineralized than peritubular*

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15
Q

Mantle dentin

A

first predentin that forms and matures within tooth

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16
Q

Circumpulpal dentin

A

deep to mantel, around wall of pulp, makes up bulk of dentin*

17
Q

Primary dentin

A

forms before completion of apical foramen

18
Q

Secondary dentin

A

forms after completion of apical foramen, forms during life of tooth
*produces smear layer

19
Q

Reparative/Tertiary/Reactive dentin

A

forms quickly in response to trauma or injury to exposed dentin

20
Q

Sclerotic dentin

A

transparent form of tertiary/reactive dentin, associated with chronic caries, shiny areas

21
Q

Hydrodynamic dentinal hypersensitivity theory

A

open dentinal tubules which have fluid moving around and irritating afferent nerve axon result in dentinal hypersensitivity

22
Q

Imbrication lines of Von Ebner

A

growth like band rings due to appositional growth of dentin

23
Q

Contour Line of Owen: Neonatal

A

number of adjoining parallel imbrication lines
Neonatal: occurring during trauma at birth, larger the trauma=longer the line

24
Q

Tome’s Granular Layer

A

peripheral part of dentin under root cementum, increased levels of interglobular dentin, appears granular and less mineralized

25
Q

List what may occur during dentin aging

A

Dentinal translucency, dentinal tubule narrows, decreases pulps ability to react to certain stimuli, dentin is more exposed

26
Q

Pulp functions

A

support/maintenance of dentin, sensory, nutrition, protective, mesenchymal pool (pulp injury), WBC

27
Q

Coronal pulp

A

located in crown of tooth w/ smaller extension into cusps of pulp horns

28
Q

Radicular pulp

A

in the root from cervical to apex

29
Q

Apical foramen

A

opening from pulp into surrounding PDL near each apex of tooth, allows communication, last part to form

30
Q

Accessory canals

A

extra openings from pulp to PDL, form from HERS encounters a blood vessel and root structure forms around it

31
Q

List the cells in pulp

A

fibroblasts, odontoblasts, undifferentiated mesenchymal stem cells, WBC, RBC

32
Q

List the fibers in pulp

A

Collagen, Reticular
NO ELASTIC FIBERS

33
Q

Pulp zones: odontoblastic

A

closest to the dentin, lines outer pulp wall

34
Q

Pulp zones: cell free

A

nerves and capillaries

35
Q

Pulp zones: cell rich

A

inward from dentin, increased density and vascular supply

36
Q

Pulp zones: pulpal core

A

center of chamber, many cells and extensive vascular supply

37
Q

Pulp aging

A

pulp horns recede, more collagen fibers, less cells in mesenchymal pool, smaller due to more dentin in pulp, lack of sensitivity as well as obliterated apical foramen blocking blood vessels (can cause vascular congestion and tooth death)

38
Q

Pulp stones/Denticles

A

mineralized masses of dentin in pulp, not a true structure, free or attached, forms due to micro trauma, common and fill most of chamber, radiopaque, may present problems in endodontic therapy