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Tooth > Dentine > Flashcards

Dentine Flashcards

1
Q

Composition of Dentine

A

inorganic 70%
organic 20%
water 10%

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2
Q

What type of filling is composite

A

hydrophobic

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3
Q

What cells form dentinogenesis

A

odontoblasts

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4
Q

Where do odontoblasts differentiate from?

A

ectomesenchyme (dental papilla)

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5
Q

Where are spherical zones of hydroyapaite-calcospherites formed?

A

dentine matrix

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6
Q

What is the 1st layer of mineralised dentine and the remaining?

A

1st - mantle dentine

remaining - circumpulpal

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7
Q

What is unmineralised dentine called

A

predentin

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8
Q

What are circular areas of mineralisation called

A

calcospherites

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9
Q

What is interlobular dentine

A

unmineralised dentine

failure of calcospherites to fuse

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10
Q

What is dentine

A

mineralised tissue forming BULK of tooth
underlies enamel in crown
covered by cementum in root area
pale yellow colour

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11
Q

What is the main inorganic component of dentine

A

hydroxyapatite

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12
Q

What is the main organic component of dentine

A

collagen fibres embedded in amorphous ground substance

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13
Q

What process occurs within the dental tubules

A

odontoblast process

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14
Q

What is secondary dentine

A

dentine continuously forming

laid down at plural end of primary dentine

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15
Q

What makes the pulp chamber reduce in size with age?

A

secondary dentine

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16
Q

Where is peritubular dentine found?

A

In each dentinal tubule surrounding the odontoblast process

17
Q

When are incremental lines visible?

contour lines of Owen

A

when dentinogenesis is disrupted

18
Q

Peritubular dentine tends to increase with age what does this reduce?

A

diameter of the dentinal tubules

19
Q

What are the two outcomes of tertiary dentine?

A

Reactionary - mild irritant
- odontoblasts survive
Reparative - strong irritant
- odontoblasts die

20
Q

where does the dentine tubules run from

A

plural surface - enamel-dentine and cementum dentine junctions

21
Q

What are the curved, sigmoid course called what the dentine tubules follow

A

primary curvatures

22
Q

Where is interlobular dentine found

A

dentine between the tubules

23
Q

What is it called when tubules change direction

A

secondary curvatures

24
Q

What is more mineralised peritubular or intertubular dentine

A

Peritubular dentine

25
Q

Mineralisation is controlled by odontoblasts by controlling which

A

controlling influx of Ca2+ ions

controlling secretion + metabolism of matrix proteins

26
Q

Mineralisation is under principal control of the

A

DPP

dentin phosphoprotein

Tooth (11 decks)

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