Dentine and Pulp

Question 1

What are properties of dentine

Answer 1

Forms bulk of tooth
Harder than bone and cementum but softer than enamel
Permeable (contains tubules)
Yellowish in colour (ivory)

Question 2

What is the content of dentine

Answer 2

Hydroxyapatite
- 70% weight (50% volume)
Water
- 10% weight (20% volume)
Organic matter
- 20% weight (30% volume)

Question 3

Where do dentinal tubules run

Answer 3

From the amelodentinal junction to the inner pulp

Question 4

What cells produce dentine

Answer 4

Odontoblasts

Question 5

What do dental tubules contain

Answer 5

Odontoblast processes
Unmyelinated nerve terminals (sensory)
Dendritic cells (immune system)
Dentinal fluid of extra cellular fluid from pulp

Question 6

Where is outer and inner dentine found

Answer 6

Outer dentine is closer to the amelodentinal junction

Inner dentine is closer to the pulp

Question 7

What is dental pulp

Answer 7

Connective tissue and the core of the tooth

Question 8

What cells are found in the pulp

Answer 8

Odontoblasts, fibroblasts and defence cells

Question 9

What are the extracellular components of pulp

Answer 9

Fibres - collagen, oxytalan

Matrix - proteoglycans, chondroitin SO4 and dermatan SO4

Question 10

What nerves are found in pulp

Answer 10

Sensory - autonomic (sympathetic)

Question 11

What are functions of dental pulp

Answer 11

Nutrition
Dentine growth
Dentine repair
Defence - immune cells - lymphatics
Neural - control of dentinogenesis

Question 12

What is predentine

Answer 12

An organised matrix that hasn’t been mineralised yet

Question 13

Does pulp contain blood vessels

Answer 13

Yes

Question 14

Does pulp contain lymphatics

Answer 14

Yes