DEH 103: Histology & Embryology

Chapters 9 & 10: Dental Pulp and Cementum

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Flip-Modus

What cells form the pulp?

Cells of the dental papilla of the embryo

What are the 2 divisions of pulp in a tooth?

Coronal pulp: in the crown larger portion than root. Has 6 surfaces (M, D, B, L, O, floor). Pulp horns extend into the cusps of the teeth.
Radicular pulp: in the roots. Has an opening through the cementum into the surrounding PDL

The apical foramen is the opening in the cementum in which the pulp extends into the PDL. How wide is this hole.

0.3 - 0.6 mm

What is the intercellular matrix of pulp composed of?

Veins
Arteris
Nerves
Fibroblasts
Collagen fibers

What is the histology of young pulp?

Fibroblasts: most numerous cell. Star shaped and responsible for formation of collagen fibers and ground substance of the pulp
Histocytes & undifferentiated mesencyhmal cells: defense mechanism
Odontoblasts: specialized dentin tissue cells

What are teh 4 zones of the pulp?

Odontoblastic zone (odontogenic zone)
Cell-free zone
Cell-rich zone
Pulpal core

This is the 1st zone of pulp that is closest to the dentin. It lines the outer pulpal wall and consists of bodies of the odotoblastic process located in the dentinal tubules in the adjacent tooth. Odontoblasts are capeable of forming secondary and tertiary dentin.

Odontoblastic zone (odontogenic zone)

What are the 3 types of junctions that can be found in the odontoblastic zone?

Tight: maintaines relationship between cells. Prevents pulp leakage into dentin
Gap: openings between odontoblasts for communication
Intermediate: combination of the above 2