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Dentine

Revision as of 23:43, 2 June 2016 by Daniel Martin (Talk | contribs)

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Dentin builds the main body of the tooth. With a Brinell-hardness of 60-70 (HB). Dentin ist covered from enamel on the side of the oral-cavity and cementum on the bone-side. It fulfills the function of a soft body, under the stiff shell of enamel. Due to this dual system, the tooth is possible to handle impacts like the chewing process, or traumas, more easy.


Chemical structure

  • Anorganic substances (Apatite) 70 (wt%)
  • Organic matrix 20 - 25 (wt%) (95-98% collagen type 1)
  • Water 5-10 (wt%)


Mantle dentin

The outer layer of the dentin is called mantle dentin. Its thickness differs from 15-30 micrometers, near the crown, to 5-10 micrometers near the root. Here the extensions of the odontoblasts are more likely to branch out and the chemical structure exhibits more collagen and less mineralization. In the area of the root, there is the granular layer of dentine. Some hypomieralizations with unclear origin.


Inner dentin

The inner dentin builds the main mass of the dentin. Since the mineralization proceeds in phases, dental incremental lines occur. Peritubular dentin wraps around the dentin tubule and interglobular dentin (hypomineralized areas) fills the space between the peritubular dentin.


Odontoblasts

Odontoblasts are cells, inside of the pulp. They extend vertical into the dentin through dentinal tubules, reaching out to the enamel. The extensions are called Tomesch’- fibres. Their diameter varies from 1 micrometer, to 2 micrometers.


Predentin

The Predentin is 5-20 micrometers thick and covers the odontoblasts. It is secreted by the odontoblasts towards the dentin side and consists of not yet mineralized collagen. While there is more and more predentin synthesized, the pulp obliterates as years go by.


Secondary dentine

Secondary dentine is produced as years go by. This process is physiological.


Tertiary dentine

Tertiary dentine is produced as response to irritations like caries, abrasion, preparation of the tooth trough the dentist etc.

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