Dentinal tubules

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Pulp-dentin representation. 1) outside the tooth / enamel 2) dentin tubules 3) dentin 4) odontoblastic process 5) predentin 6) odontoblast 7) ​​capillaries 8) fibroblasts 9) nerves 10) arteries / veins 11) cell-rich zone 12) cell-poor zone 13) pulp chamber

Dentinal tubules ( dentinal tubules ) denote about 1-2 microns large cavities that the dentin of the tooth by moving from outside to inside. They house the tomes fibers of the odontoblasts as well as myelinated nerve fibers. The cell bodies of the odontoblasts are located along the dentin- pulp border and their extensions reach just below the enamel-dentin border. The dentinal liquor is located in the dentinal tubules. Movement of the dentinal fluid is an important factor in the aetiology of pain known as hydrodynamic theory .

The dentinal tubules of the two adjacent dentine layers do not communicate with each other, which means that the connection between the outer dentinal tubules and the pulp (“tooth nerve”) is interrupted. This is a protection against the influx of agents ( acids , toxins ) into the pulp tissue. They are indirectly connected to nerve endings via the dentinal fluid, so that pain, temperature, pressure and other stimuli can be perceived via the dentinal tubules. The density of the canals decreases with increasing distance from the dentin-pulp boundary to the tooth surface.

If the dentinal tubules are opened, for example by a tooth fracture or a preparation (grinding) of the tooth for a tooth filling or crown , then one speaks of a dentine wound. Non-biocompatible filling components can lead to pulpitis via dentinal tubules . There is also a risk of bacterial contamination, which can also lead to pulp inflammation.

Sensitive tooth necks also arise from the transmission of stimuli, especially cold stimuli, via the dentinal liquor in the dentinal tubules.

Individual evidence

  1. ↑ Brännström 1966, 1986.
  2. ↑ Anatomy and Physiology of the Pulp-Dentin-System (PDF; 1.6 MB), Hülsmann, Checklists of Dentistry, Endodontics, Georg Thieme Verlag, 2008. ISBN 3-13-138251-1