Dentine and Pulp

Question 1

Which substance of the tooth forms the bulk of the tooth?

Answer 1

Dentine

Question 2

What is dentine harder and softer than?

Answer 2

Harder than bone/cementum
softer than enamel

Question 3

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

Answer 3

dentine

Question 4

What aspect of dentine makes it permeable?

Answer 4

tubules

Question 5

What is the colour of dentine?

Answer 5

yellow

Question 6

What is the content of dentine?

Answer 6

HA - 70% weight 50% volume
Water - 10% weight 20% volume
Organic Matrix - 20% weight 30% volume

Question 7

What does the primary curvature of the dentine look like?

Answer 7

s-shaped

Question 8

What does the secondary curvature of the dentine look like?

Answer 8

wavy

Question 9

What are the two properties that distinguish dentine and enamel?

Answer 9

dentine is sensitive. dentine is formed throughout life, increasing in thickness at the expense of the dental pulp.

Question 10

What happens in dentine due to age?

Answer 10

Due to age, dentine builds up on the inside of the tubules

Question 11

Does dentine form inwards or outwards?

Answer 11

Forms at ADJ and moves inwards to pulp (our teeth do not get larger as we age)

Question 12

What is primary dentine?

Answer 12

Formed when tooth begins to form

Question 13

What is secondary dentine?

Answer 13

Formed once tooth is fully formed

Question 14

What is tertiary dentine?

Answer 14

Formed after damage has been done to tooth

Question 15

What cells make dentine?

Answer 15

odontoblasts

Question 16

What is pre-dentine?

Answer 16

dentine that is not mineralised

Question 17

How do odontoblasts create tubules?

Answer 17

they shoot arms into the dentine

Question 18

What are the contents of tubules?

Answer 18

odontoblast process
unmyelinated nerve terminals (sensory)
dendritic cells (immune system)
dentinal fluid

Question 19

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

Answer 19

pulp

Question 20

What are the cells present in the dental pulp?

Answer 20

odontoblasts, fibroblasts, defence cells

Question 21

What are the ECM components of pulp?

Answer 21

fibres (collagen, oxytalan
matrix (proteoglycans, chondroitin SO4, dermatan SO4)

Question 22

What nerves are found within the dental pulp?

Answer 22

sensory (autonomic, sympathetic)

Question 23

What else is contained in the pulp?

Answer 23

blood vessels and lympathics

Question 24

What happens if the pulp is inflamed?

Answer 24

it can cause damage to the pulp

Question 25

What are the functions of the pulp?

Answer 25

nutrition, dentine growth, dentine repair, neural (sensory, control of dentinogenesis), defence (immune cells, lymphatics)

Question 26

What penetrates dentine from the pulp?

Answer 26

axons of neurons

Question 27

Where are tubules widest?

Answer 27

near the pulp

Question 28

What is the only sensation emitted from dentine and pulp?

Answer 28

pain

Question 29

What kind of tissue is pulp?

Answer 29

loose connective tissue

Question 30

What dentine does the pulp produce when it receives a strong stimuli?

Answer 30

tertiary

Question 31

Embrologically, what do both dentine and pulp develop from?

Answer 31

dental papilla