Dental Pulp Complex Flashcards
What is dentine
Calcified collagenous matrix
Bulk of the tooth
Penetrated by processes of odontoblast cells
Tubular structure
What is the pulp
Connective tissue situated within the tooth
Enclosed by dentine excluding apical region
What is the origin of odontoblasts
Ectomesenchymal
Where is the embryological origin of odontoblasts
From dental papilla
Where do the odontoblasts lie
On the periphery of the pulp
What are odontoblasts surrounded by
Mineral rich extracellular fluid
How do dental tubules connect
With lateral branches
When is primary dentine completed
When crown and root are formed 3 years after eruption
How is reactionary dentine formed
By original odontoblasts
How is reparative dentine formed
By newly differentiated odontoblastic like cells
what are the 2 types of tertiary dentine
Reactionary
Reparative
What are the 5 functions of the pulp
Maintain health of dentine
Path for sensory impulses
Initiates and governs dentine repair
Defence - triggers inflammatory and immune response
Protection - secondary and tertiary dentine
What matrix does the pulp contain
Amorphous aqueous matrix
List 3 pulpal fibres
Collagen
Fibronectin
Oxytalan
What is the function of the oxytalan in the pulp
Keeps the lumen of blood vessels open
Where are odontoblasts
Next to the predentine
What is the blood flow in pulpal blood vessels
40-50 mls/min/100g
Where do the main pulpal nerves travel
In a coronal direction and divide near pulpo dentinal border to form the plexus of Raschkow
How many axons are in primary teeth
1000 - 3000
Which pulpal nerve represents sharp pain and dentine sensitivity
A Delta
What are the 3 main pulpal nerves
A Delta
C fibres
Autonomic fibres
Which pulpal nerve is myelinated
A Delta
Which pulpal nerve has very quick transmission impulses
A Delta
Where do A Delta pulpal nerves move
Fluid movement in dentinal tubules
Which pulpal nerve is unmyelinated
C Fibres
Which pulpal nerve is a slower transmission
C Fibres
Which pulpal nerve gives a dull and prolonged pain
C Fibres
What 3 stimuli do C Fibres give off
Thermal
Mechanical and chemical
What is the function of autonomic fibres
Control blood flow
Control dentine formation
Where do autonomic fibres get their supply
Sympathetic and parasympathetic
What 2 ways does the dentine help protect the pulp from caries
Increase in length of tubules or decrease the diameter
What happens to the pulp during mild and moderate pulpal insults
Increased blood flow to the pulp
