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Dental pulp

(Redirected from Pulp)

German: Zahnpulpa

1 Definition

The dental pulp is located inside of the pulp cavity and is covered by dentin. It enters the tooth via the apical foramen through the root canal and expands like the incisal ridge or the cusps. In terms of anatomy the pulp can be divided into the crown pulp and the root pulp. In young ages the pulp chamber is bigger which makes the teeth more sensitive. As years go by the pulp chamber shrinks, because of the apposition of secondary dentin. The main function of the pulp is the building and supporting of dentin. It also has a sensory function.

2 Soft tissue

The soft tissue is built up of highly specialized, very well vascularized, connective tissue.

3 Cells

3.1 Odontoblasts

Highly differentiated, polarized cells, which are not able to divide. They build up a single-layered lining under the dentin. Their extensions of the cytoplasm can be up to 5mm long and make their way through the dentin via the dentin tubules.

3.2 Fibroblasts

Fibroblasts are the predominant type of cell. They produce intercellular substance and collagen (Mostly type I, but also type III).

3.3 Immune cells

Macrophages, lymphocytes, mastocytes and dendritic cells, protect against infection.

3.4 Not differentiated mesenchymcells

Can assume the function of odontoblasts, fibroblasts, osteoblasts and macrophages

4 Ramifications

At the root tip, the pulp has lateral branches, which are called ramifications

5 Nerve fibres

  • A-delta-fibres
  • c-fibres

6 Plexus of Raschkow

Nerve fibres, adjacent to the odontoblasts.

7 Weil-zone

Pulp-tissue subsequent to the odontoblasts. The Weil-zone is cell-poor. It is the zone between the odontoblasts and the fibroblasts and mesenchymal cells.

8 Pulp stones

Calcification of necrotic or degenerated tissue. Pulp stones are very common (90% of all teeth at the age of 50 show pulp stones), but usually do not cause any complications

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