Pulp Flashcards
What are the main two types of cells in the pulp?
Fibroblasts followed by odontoblasts
What are the 4 histological zones in the dental pulp? outer to inner
1-Odontoblast layer
2-Cell free zone of weil
3-Cell rich (cell dense) zone
4-Pulp core
What is the most common type of collagen in the pulp?
Collagen III
What is the sensory end (dentinal end of odontoblast) called?
Golgi bundles
What cell-cell structure connects the odontoblasts?
Adherans junctions not zonular
In what 2 zones are the fibroblasts found?
Cell rich zone and pulp core
Why are there mesenchymal progenitor cells in the pulp?
Repair. In response to damage of the dentin, they are recruited to form new odontoblast like cells that help form reparative dentin
What cell of the innate immune system is alway in the pulp?
Marcophages. In health they help turnover the tissue and in response to infection they are part of the immune response
What cell of the acquired immune system is present under the odontoblast layer?
Dendritic cells, they are antigen presenting cells
You also see T and B lymphocytes throughout the pulp
Explain the vascularization of the teeth.
Arteries arise from the external carotid to superior/inferior alveolar arteries. There are 4-8 arterioles per root. Capillaries are found in the cell free zone.
What type of innervation is in the dental pulp?
Sympathetic only
As nerve fibers brach out in the coronal part of the pulp what is formed?
The plexus of Raschkow
Where do nerve fibers entering the pulp arise from?
CN V trigeminal and sympathetic branches from the superior cervical ganglia
What are the three possibilities for the cause of dentin sensitivity?
1-Direct innervation of the dentin
2-Odontoblast nociception
3-Tubule fluid conductance (hydrodymanic theory)
