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Laura’s Histology > Dentine And Pulp > Flashcards

Dentine And Pulp Flashcards

1
Q

Colour of dentine

A

Yellow

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2
Q

Function of dentine

A

Support enamel

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3
Q

Characteristics of dentine

A

Compressive, tensile strength, permeable, harder than cementum but softer than enamel

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4
Q

Content of dentine vs enamel

A

70% hydroxyapatite 10% water 20% organic matrix in dentine.
Enamel is 95% HA

When we prepare tooth, remove mineral content, enamel goes. Organic content of dentine stays so you can see it in slides that are demineralised an decalcified.

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5
Q

Shape of dentinal tubules

A

Sigmoidal shape s shape

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6
Q

Where is intratubular dentine

A

The space between the original tubule outline and the narrower thinner tubule outline

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7
Q

Inter vs intratubular

A
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8
Q

As you grow older, what happens to dentinal tubules

A

Becomes narrower

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9
Q

Relation of dentine and pulp

A

Dentine is a live tissue. Living cells present, called odontoblasts. Dentine is produced in an organic matrix. Before it’s mineralised, it’s called pre dentine.

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10
Q

InterGlobular dentine

A

Interglobular dentine arises because of incomplete fusion of calcospherites with the mineralising front as dentine is laid down and mineralised. This incomplete fusion traps areas of poorly mineralised dentine matrix within the dentine in the form of ‘arches’ that reflect the original spherical nature of the calcospherites.

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11
Q

What are the cells that produce dentine

A

Odontoblast

Produce dentine throughout your life. The odontoblast is the cell responsible for forming dentine and maintaining it. It initially secretes a collagenous matrix (the predentine) which is then subsequently mineralised (partly by the fusion of calcospherites).

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12
Q

Contents of the dentinal tubules

A

Odontoblast process, UNMYELINATED nerve terminal , dendritic cells, ecf from pulp called dentinal fluid

No blood vessels

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13
Q

What cells are found in the dental pulp

A

Fibroblasts predominate
Odontoblast
Defence cells

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14
Q

Contents of the dental pulp

A

Cells
ECM (fibres and jelly like ground substance with Chondroitin sulphate)
Nerves
Blood vessels
Lymphatics

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15
Q

Is dentine live tissue

A

Unlike enamel, the dentine and the pulp (which are treated together, because the dentine develops from the pulp) are living tissues, with cells, blood vessels, and nerves

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16
Q

What are the nerves present in dental pulp?

A

Sensory nerves for pain
Autonomic sympathetic nerves for blood flow

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17
Q

Which nerves control blood flow in the pulp?

A

Autonomic sympathetic nerves

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18
Q

How dentine is formed?

A

Primary dentine when the tooth is formed.

Secondary dentine is after the tooth had been formed

19
Q

Tertiary dentine

A

Repair and protection through the regenesis of dentine

20
Q

What happens when there is inflammation of the dental pulp?

A

Swelling, increase in volume leads to increase in pressure, damages the circulatory system so the pulp degenerates

21
Q

What’s found at the odontogenic zone?

A

Pre dentine
Dentine
Odontoblasts
Cel free zone
Cell rich zone

22
Q

What is the cell rich zone?

A

Where cells like fibroblasts and nerve/blood vessels are found in the pulp

23
Q

What is predentine

A

Predentine is the area where the dentine matrix has not been mineralised yet.

24
Q

Functions of dental pulp

A

Nutritive
Dentine growth and repair
Defence (immune and lymphatics)
Neural (pain and control of blood flow)

25
Q

Importance of knowing where the blood vessels are located in the pulp

A

Blood vessels do not penetrate into the dentine layer, remains only in the pulp. If you see a tooth bleeding, it means you have exposed the pulp

26
Q

Are there nerve fibres in dentine?

A

Yes, it does penetrate dentinal tubules but not deeply. Short distance into inner dentine

27
Q

Where does the concept of dentine-pulp come from

A

Cell body of the odontoblast lies at the interfere with the dental pulp

28
Q

Two major properties that distinguish enamel from dentine

A

Dentine is sensitive
Dentine is formed throughout life

29
Q

What happens to the dental pulp as you grow older?

A

The dentine layer becomes thicker and the pulp becomes smaller

30
Q

What passes from the pulp into the dentine

A

Odontoblasts, dendritic processes of antigen presenting cells, unmyelinated nerve fibres

31
Q

What gives dentine its tensile strength and compressive strength

A

Organic matrix and tubular architecture

32
Q

What stresses are more like to fracture dentine?

A

Stresses Parallel to direction of the dentinal tubules are more likely to fracture than stresses at a right angle

33
Q

What is the histological classification of dental pulp

A

Loses Connective tissue

34
Q

When does secondary dentine begin to form

A

At the completion of root formation and as the tooth comes into occlusion

35
Q

Shape and structure of secondary dentine

A

Tubular pattern Less regular than that if primary dentine because of the slower rate of deposition

36
Q

Where does majority of the branching in dentinal tubules occur at

A

At the ADJ, immediately under the enamel

37
Q

Where are dentinal tubules closer together

A

Inner dentine

38
Q

Where are dentinal tubules larger

A

Inner dentine

39
Q

Types of dentine (pri secondary tertiary)

A

Primary dentine
- mantle
- interglobular
Peritubular
Intertubular

Secondary
- circumpulpal

Tertiary
- reparative
- sclerotic

40
Q

In a person with Vitamin D deficiency, what will their dentine look like?

A

More interglobular dentine

41
Q

Dentinogenesis

A

Performed by odontoblasts,
Dentine grows from outside to inwards

42
Q

What are dead tracts

A

When odontoblasts die of trauma or old age, dead tracts develop in dentine. The tubules calcifyas they fill with mineral to form sclerotic dentin.

43
Q

What are Tomes processes?

A

Tomes processes are projections that develop when ameloblasts move away from the ADJ when the first layer of enamel, has formed

Laura’s Histology (12 decks)

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