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Oral Biology (Oral Cavity) > Pulp > Flashcards

Flashcards in Pulp Deck (30)
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What is dental pulp

• The specialized soft connective tissue of the tooth
• Occupies the pulp chamber and root canal(s)


What is the role of the dental pulp

• Active throughout life and maintains health of dentine through odontoblast layer
• Functionally and structurally associated to dentine
• Provides sensation (nerve endings) and blood supply (nutrients and immune cells)


What is the coronal pulp

occupies the crown of the tooth and has six surfaces; occlusal, mesial, distal, buccal, lingual and the floor.


What is the radicular pulp

extends from the cervix down to the apex of the tooth. Molars and premolars exhibit multiple radicular pulps. This pulp is tapered and conical


Where can odontoblasts be found in the dentin

right next to the pulp, innermost section of the dentin layer


What do the fibroblasts in the pulp do

Demonstrates the ability to degrade collagen as well as form it


What is the role of perivascular cells in the pulp

Undifferentiated mesenchymal cells, they're present in the pulp and can give rise to odontoblasts, fibroblasts or macrophages


What is the zone of weil in the pulp

Its a cell-free zone that consists of nerves and capillary plexuses


What are the microscopic zones of the pulp

Odontoblastic layer
Cell-free zone
Cell-rich zone (more cells and vascularity)
Pulpal core (more cells and vascularity)


What is the role of odontoblasts in the pulp

Contributes to the protection of the pulp

BTW - the processes of odontoblasts still extend into the dentin tubules from the pulp


What are some inflammatory cells in the pulp

T lymphocytes
Dendritic antigen presenting cells


Where are macrophages found in the pulp

Found predominantly around central blood vessels and
adjacent to odontoblast layer


Where are dendritic antigen presenting cells found in the dentin

Similar distribution to macrophages, but also may be found between odontoblasts and dentine


What is the bottom point of the roots where the pulp enters through called

the apical foramen


Describe how the vascular supply ascends to the pulp

- small arterioles enter the pulp via the apical foramen
- ascend through the radicular pulp of the root canal
- branch out peripherally to form a dense capillary network immediately under and sometimes extending up into the odontoblast layer
- Small venules drain the capillary bed and eventually leave as veins via the apical foramen.


Why are pulpal vessel walls allowed to be very thin

As the pulp is protected by a hard unyielding sheath of dentin.


Why do the capillaries in the pulp exhibit numerous pores

the high metabolic activity of the odontoblast layer


Is blood flow/pressure quite high or low in the pulp

Quite high


What are arteriolar-venous anastomoses

Points that are frequent in the pulp where the arteries and vein vessels connect and overlap


What autonomic fibres are found in the pulp

Only sympathetic fibres


Describe the features of the sympathetic fibres, include where they originate

• fibres extend from the neurons whose cell bodies are found in the superior cervical ganglion at the base of the skull
• They are unmyelinated fibres
• Travel with the blood vessels.


What do the sympathetic fibres in the pulp do

They innervate the smooth muscle cells of the arterioles and therefore function in regulation of blood flow in the capillary


What afferent (sensory) fibres are found in the pulp and where do they terminate

- maxillary and mandibular branches of the fifth cranial nerve
- terminate in the central pulp


What is the subodontoblastic plexus

Small individual fibres from the afferent fibres that form this plexus just under the odontoblast layer, these terminate as free nerve endings near the odontoblasts.


Where is the subodontoblastic plexus mainly found

The subodontoblastic plexus is primarily located in the roof and lateral walls of the coronal pulp. It is less developed in the root canals.


What are the functions of the dental pulp

A living pulp is required to maintain dentine integrity and tooth sensitivity
- The primary function is providing vitality to the tooth.
- inductive
- protective


What is the inductive function of the pulp

very early in development the future pulp interacts with surrounding tissues and initiates tooth formation.


Describe the protective function of the pulp

pulp responds to stimuli like heat, cold, pressure, operative cutting procedures of the dentin, caries, formation of sclerotic and reactive dentin


What does inflammation of the pulp due to caries cause

high fluid content and swelling: compression of nerve fibres on the walls of the pulp cavity and pain


What happens to the pulp with age

• less cellular
• more fibrous
• overall reduction in volume due to the continued
deposition of dentin (secondary/reactive)