Dentine and Pulp Flashcards
What NEVER enters dentine?
Blood vessels
What forms the bulk of the tooth?
Dentine
What is dentine harder than?
What is dentine softer than?
Harder than cementum and bone
Softer than enamel
What does dentine contain that makes it permeable?
Dentine Tubules
What is the function of dentine?
Provides compressive and tensile strength to resist pressure
What can be said about areas that receive greater force?
Greater dentine layers
What are the 3 components that make up dentine?
Give their percentages (Weights and Volumes)
Hydroxyapatite (70% weight. 50% volume)
Water (10% weight. 20% volume)
Organic Matrix (20% weight. 30% volume)
What is it called when dentine tubules run in an S-shape?
Primary curvature
What is it called when dentine tubules run in a wavy shape?
Secondary curvature
What type of dentine forms the wall of each tubule?
Intratubular / peritubular dentine
What is the dentine between tubules called?
Intertubular dentine
Where do dentine tubules grow from?
Amelo-dentinal junction
What can be said about size and maturation of dentine tubules?
They get smaller as they mature
What are the 4 components that make up dentine tubules?
- Odontoblasts
- Dendritic cells
- Extracellular pulp fluid
- Unmyelinated sensory nerves
Where is:
1. Inner dentine
- Outer dentine
- near pulp
2. near amelo-dentinal junction
What dentine is non-mineralised?
Pre dentine
What is dental pulp?
Connective tissue that forms the core of the tooth
What are the 3 cell types found in pulp?
Odontoblasts
Fibroblasts
Defence cells
What type of nerves are found in dental pulp?
Sensory nerves
What are 2 extracellular components in dental pulp?
Extracellular fibres and extracellular matrix
What is the primary function of dental pulp?
Dentine growth and repair
What does dental pulp provide odontoblasts with?
Nutrients for growth
What process does dental pulp control?
Formation of dentine
What are 2 additional functions of dental pulp?
Defence and sensory function
Where is primary dentine found?
Near the amelo-dentinal junction
What dentine is formed in response to damage and has a repair function?
Tertiary dentine
