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Dental enamel

Revision as of 23:11, 31 May 2016 by Daniel Martin (Talk | contribs)

With a brinell hardness of 300- 350 HB, enamel is the hardest substance the human body can produce. It covers the crown and can differ in its thickness from up to 2 mm, at the cusps of the crown, down to 0,1mm at fissures and is phasing out to the cervical area.

1. Chemical structure:

  • 1.1 Anorganic substances (Apatite) 95 – 98 (wt%)
Hydroxyapatite [Ca5 (PO4)3 OH]
Fluorapatite [Ca5 (PO4)3 F]

Carbonapatite [Ca10 (PO4)6 CO3]

  • 1.2 Organic matrix (amelogenin, enamelin) 1-2 (wt%)
  • 1.3 Water 3-4 (wt%)

2. Crystalline structure:

The Enamle consists of enamel-prisms with a diameter of 4-5 mycrometers (built up out of ca. 1000 apapite-crystals), growing in size from the enamel-dentin-boarder, towards the surface. Between the prisms, there is interprismatic enamel. The last 30-80 mycrometers of the enamel surface is free from prisms.

3. Hunter-Schreger-stripes:

The prisms grow vertical to the enamel-dentin-boarder and make their way to the surface as bundles. This is the reason for the so called Hunter-Schreger-stripes. Bright and dark stripes occurring, because of the different light refraction.

4. Retzius-stripes (growth-lines)

Parallel to the surface there is a second type of stripes. The so called Retzius-stripes occur, because of the periodical calcification of the enamel.

Enamel has no cells included and therefore cannot be regenerated.

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