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Oral Biology > Dentine and Pulp > Flashcards

Dentine and Pulp Flashcards

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1
Q

What NEVER enters dentine?

A

Blood vessels

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2
Q

What forms the bulk of the tooth?

A

Dentine

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3
Q

What is dentine harder than?

What is dentine softer than?

A

Harder than cementum and bone

Softer than enamel

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4
Q

What does dentine contain that makes it permeable?

A

Dentine Tubules

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5
Q

What is the function of dentine?

A

Provides compressive and tensile strength to resist pressure

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6
Q

What can be said about areas that receive greater force?

A

Greater dentine layers

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7
Q

What are the 3 components that make up dentine?

Give their percentages (Weights and Volumes)

A

Hydroxyapatite (70% weight. 50% volume)

Water (10% weight. 20% volume)

Organic Matrix (20% weight. 30% volume)

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8
Q

What is it called when dentine tubules run in an S-shape?

A

Primary curvature

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9
Q

What is it called when dentine tubules run in a wavy shape?

A

Secondary curvature

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10
Q

What type of dentine forms the wall of each tubule?

A

Intratubular / peritubular dentine

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11
Q

What is the dentine between tubules called?

A

Intertubular dentine

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12
Q

Where do dentine tubules grow from?

A

Amelo-dentinal junction

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13
Q

What can be said about size and maturation of dentine tubules?

A

They get smaller as they mature

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14
Q

What are the 4 components that make up dentine tubules?

A
  • Odontoblasts
  • Dendritic cells
  • Extracellular pulp fluid
  • Unmyelinated sensory nerves
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15
Q

Where is:
1. Inner dentine

  1. Outer dentine
A
  1. near pulp

2. near amelo-dentinal junction

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16
Q

What dentine is non-mineralised?

A

Pre dentine

17
Q

What is dental pulp?

A

Connective tissue that forms the core of the tooth

18
Q

What are the 3 cell types found in pulp?

A

Odontoblasts

Fibroblasts

Defence cells

19
Q

What type of nerves are found in dental pulp?

A

Sensory nerves

20
Q

What are 2 extracellular components in dental pulp?

A

Extracellular fibres and extracellular matrix

21
Q

What is the primary function of dental pulp?

A

Dentine growth and repair

22
Q

What does dental pulp provide odontoblasts with?

A

Nutrients for growth

23
Q

What process does dental pulp control?

A

Formation of dentine

24
Q

What are 2 additional functions of dental pulp?

A

Defence and sensory function

25
Q

Where is primary dentine found?

A

Near the amelo-dentinal junction

26
Q

What dentine is formed in response to damage and has a repair function?

A

Tertiary dentine

Oral Biology (9 decks)

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