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DOH110 Oral Health sciences 1 > W8 Dentine > Flashcards

W8 Dentine Flashcards

1
Q

What are the physical properties of dentine?

A

Pale yellow. Harder than bone and cementum but softer than enamel. Higher degree of tensile and flexural strength than enamel

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2
Q

What are the chemical properites by volume of dentine?

A

By volume Inorganic 50%
Organic 30%
Water 20%

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3
Q

Is enamel Vascular or Avascular?

A

Avascular

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4
Q

What are the chemical properties of dentin?

A

Inorganic: hydroxyapatite

Organic: collagen fibres, ground sustance, collaen I, III, IV

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5
Q

What are the chemical properties of organic dentine?

A

Proteins, dentine phosphoproeins, proteoglycans, lipids

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6
Q

What are dentine tubules?

A

Run from pulpal surface to DEJ. Segmoid primary curvatures (S shape). Peritubular and intertubular dentine. Secondary curvatures form called contour lines of Owen when they conicide in ajacent tubules.

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7
Q

Where and what types of dentin curvatures can be found?

A

Granular layer of Tomes found in root, when dentine tubules are in the crown they are called Contour lines of Oen

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8
Q

What is Peritubular Dentine?

A

The zone of dentine forming the wall of dentine tubules, has 9-15 % higher mineral content than intertubular dentine, smaller crystals than intra.

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9
Q

What are the Odontoblast & processes?

A

Elongates as the odontoblast moves toward pulp, stimulates differentiation of ameloblasts

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10
Q

What is primary dentine?

A

Formed prior to eruption, depositied at DEJ and contain incremental lines. Out layer is mantle dentine. Circumpulpal dentine, globular dentine, peritubular and intertuular form in this zone

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11
Q

What classification of dentine?

A

primary, secondary,

teritary

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12
Q

What is Secondary Dentine?

A

Formed after the completion of root formation, same as circumpulpal. Scattered more slowly than primary dentine.

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13
Q

What is tertiary dentine?

A

Forms if dentine is subjected to trauma, irritation, caries into dentine, traumatic cavity prep

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14
Q

What is reactionary dentine?

A

Dentine foriming in response to an insult existing cells recover.

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15
Q

What is reparative dentine?

A

Dentine forming in response to an insult, original odontoblasts destroyed and produced calcifed tissue

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16
Q

What are the layers of dentine in the crown?

A

Mantle, Interglobular, circumpulpal

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17
Q

What are the layers of dentine are in the root?

A

Hyaline layer, granular of Tomes, Circumpulpal dentine

18
Q

What is mantle dentine?

A

Depositied along DEJ. Secreted by immature odontoblasts. Mineralised by matrix vesticles

19
Q

What is Circumpulpal dentine?

A

Layer of dentine found around the outer pulpal wall, makes bulk of tooth. Formd and matured after mantle dentine. In the crown it is beneath mantle and interglobular dentine
In the root it is beneath the granular layer of TOmes

20
Q

What is globular dentine?

A

Layer between mantle and circumpulpal, found in the coronal portion, May contain interglobual spaces.

21
Q

What is peritubular?

A

Immediately surrounds dintinal tubule, high mineral content and lacks collagenous matrix

22
Q

What is Intertubular

A

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

23
Q

What is the Hyaline layer?

A

Most peripheral layer of initially unmineralised dentine, aids cementum in binding to dentine. Sits betwwen Cementun and Tomes granular layer

24
Q

What is the Granular layer of Tomes?

A

In the root beneath the hyaline layer and cementum

25
Q

What is predentine?

A

The innermost layer of dentine. Non mineralise. Composed of collagen and proteoglycans

26
Q

What is translucent dentine?

A

Forms with aging due to tubule occlusion by peritubular dentine, pronouced at the root apex.

27
Q

What is sclerotic dentine?

A

Tubular occlusion by stimulus, tubules are completely obliterated

28
Q

What are dead tracts?

A

Odontoblastic processes killed by a stimulus, empty tubules.

29
Q

What factors prevent bacteria from invading dentine tubules?

A

Outward dentinal fluids contains immunoglobulin. Presenses of intratubular deposits of mineral, large collagen fibrils

30
Q

What are Lines of Von Ebner?

A

Cross striations across dentinal tubules - thick and thin segments

31
Q

What are Contour lines of Owen?

A

As dentine mineralises it follows a patter, DEJ meet the accompanying striae of Retzius that was formed at the same time

32
Q

What structural lines are associated with primary curvatures?

A

Sigmoid curvatures called Schreger lines

33
Q

What structural lines are associated with secondary curvatures?

A

Contour lines of Owen

34
Q

What structural lines are associated with Incremental lines?

A

Short period; Von Ebner lines

Exaggerated line- neonatal

35
Q

What is coronal pulp?

A

Occupies crown of tooth, larger than root pulp and different structure + pulp horns

36
Q

What is radicular pulp?

A

Extends from cervical regions to apex of tooth.

37
Q

What is the Apical Foramina and Accessory canals

A

Opening of toot pulp into periodontium.

38
Q

What is pulp?

A

Soft specialised connected tissue, rich and scularised and innervated

39
Q

What is the role of the pulp?

A

Induction: interacts with oral epithelium to initiate tooth formation.
Formative: odontoblast from dentine
Caries o2 highly vasuclar.

40
Q

What is the composition of dental pulp?

A

Loose CT. Type I collagen fibres, ground substance, mesenchymal cells, neurons

41
Q

What is the histological organisation?

A

Odontogenic zone, odontoblast layer, cell free zone, cell rich zone, central pulp

42
Q

What are some pulp cell types?

A

Odontoblasts, fibroblasts, scwann cells, endothelial cells

DOH110 Oral Health sciences 1 (25 decks)

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