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BDS1 Oral Biology > Dentine and Pulp > Flashcards

Dentine and Pulp Flashcards

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1
Q

Which substance of tooth forms the bulk of the tooth?

A

Dentine

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2
Q

What is dentine harder and softer than?

A
  • Harder then bone and cementum but softer than enamel
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3
Q

What has a greater compressive and tensile strength: enamel or dentine?

A

Dentine

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4
Q

What aspect of dentine makes it permeable?

A

It contains tubules

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5
Q

What is tensile strength?

A

Ability to resist tension and sharing forces

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6
Q

What is compressive strength?

A

Resist to compression, lower then enamel
- Dentine is able to cushion effect of sharing forces on enamel so able to absorb the force for enamel as sifter - work together - resist abrasion and sharing forces on tooth

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7
Q

What is the hydroxyapatite content of dentine?

A

70% weight (50% volume)

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8
Q

What is the water content of dentine?

A

10% weight (20%) volume

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9
Q

What is the organic matrix content of dentine?

A

20% weight (30% volume)

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10
Q

What does the primary curvature of dentine look like?

A
  • S-shaped
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11
Q

What is the secondary curvature of dentine?

A
  • Wavy
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12
Q

Does dentine form inwards or outwards?

A

Forms at ADJ and moves inwards to pulp

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13
Q

What is primary dentine?

A

Formed when tooth begins to form

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14
Q

What is secondary dentine?

A

Formed once tooth is fully formed

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15
Q

What is tertiary dentine?

A

Formed after damage has been done to tooth

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16
Q

What cells produce dentine?

A

Odontoblasts

17
Q

What is pre-dentine?

A

Non mineralised dentine

18
Q

What are the contents of dentinal tubules?

A
  • Odontoblast process
  • Unmyelinated nerve terminals
  • Dendritic cells (immune system)
  • Dentinal fluid or ECF from pulp
19
Q

What are proteoglycans?

A
  • Proteins with sugar side chains

- They absorb water

20
Q

What is the connective tissue ‘core’ of the tooth?

A

Dental pulp

21
Q

What are the cells present in the dental pulp?

A
  • Odontoblasts
  • Fibroblasts
  • Defence cells
22
Q

What are the extracellular components of dental pulp?

A
  • Fibres (collagen, oxytalan)

- Matrix (proteoglycans, chondroitin SO4, dermatan SO4)

23
Q

What nerves are found within the dental pulp?

A
  • Sensory; autonomic (sympathetic)
24
Q

Does dental pulp contain blood vessels and lymphatics?

A

Yes

25
Q

What are the functions of dental pulp?

A
  • Nutritive (feeds odontoblasts to allow them to produce dentine)
  • Dentine growth
  • Dentine repair
  • Defence (immune cells; lymphatics)
  • Neural (sensory, control of dentinogenesis)

BDS1 Oral Biology (11 decks)

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