dental pulp
TRANSCRIPT
Dental Pulp
Professor Dr. Maha Mounior
Dental Pulp
Pulpal architechture• Loose CT derived from neuralcrest cells, coffined to pulpchamber& RC
Pulpal architechture• Cell free zone• Cell rich zone: containsprogenitor odontoblasts• Central pulp: pulp proper• Contains large BV &nerve trunks• Myelenated & unmyelen-ated nerves are in closeassociation with BV
Pulp architecture• Cells of pulp,cell free zone,cell rich zone,parietal neural plexus,blood vessels& lymphatics
Cells of the pulp
1. Odontoblasts2. Fibroblasts3. Undifferentiated mesenchymal cells4. Inflammatory cells5. Cells associated with blood vessels:
endothelial cells, perivascular cells, &pericytes
6. Stem cells
Fibroblasts• Most numerousCells & are locatedThroughout the pulpProduce groundSubstance+collagenFibers.By age become smaller spindle shaped with
few organells.
Endothelial cells lining capillaries
Plexus of Rashcow
plexus of RashcowSilver stain: nerves &Nerve endings
Vasculature of the pulp
• Larger vesels conductBlood in the central pulp& smaller capillaries areIn the peripheral pulp.
Functions of the pulp
• 1- Cells of pulp + blood vessels & nervesprovides the tooth vitality
• 2- Inductive function• 3- Formative• 4- Protective• 5- Nutrative• 6- Reparative
Fibers & ground substance
• Odontoblasts produce type I collagen• Pulpal fibroblasts secrete III collagen
fibers ( type I predominates)• In young age fibers are sparse, increase
with advancing age or due to irritation.• Fibrosis is either localized increase in
collagen fibers or diffuse fibrosis
Regressive changes in the pulp
• Fibrous changes• Pulp stones
Fibrous changes in pulp
Fibrosis is due to aging &Injury.-increase in collagen fibers’bundles which becomesmore evident with thedecrease in pulp size.
Pulp stones
Pulp stonesClassified according to its structure into:
True & False• True denticles: have dentinal tubules like
dentin, odontoblastic processes & fewodontoblasts
• False denticles: are concentric layers ofcalcified tissue with a central cellular area(which might be necrotic & acts as nidus ofdenticle formation)
• Classified according to its structure into:free, attached & embedded
Pulp stones or denticles
• Are round to ovalcalcified masses in:normal pulps or injuredPulps (microtrauma)• False pulp stones
True pulp stone
• Free & true
• Attached & true
Pulp stones
• Results from ectopic calcification due tomicrotrauma or aging
• Normally are asymptomatic, unless theyimpinge on blood vessels or nerves
Thank You