Medicipate! Increase your knowledge dose 
Increase your knowledge dose
Write article
Please log in to edit this article.

Dental enamel

Synonym: Substantia adamantina, Enamelum
German: Zahnschmelz

1 Definition

With a brinell hardness of 300- 350 HB, the dental 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 0,1 mm at fissures and is phasing out to the cervical area.

2 Chemical structure

  • Anorganic substances (Apatite) 95 – 98 (wt%)
    • Hydroxyapatite [Ca5(PO4)3OH]
    • Fluorapatite [Ca5(PO4)3F]
    • Carbonapatite [Ca10(PO4)6CO3]
  • Organic matrix (amelogenin, enamelin) 1-2 (wt%)
  • Water 3-4 (wt%)

3 Crystalline structure

The dental 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 are free from prisms.

4 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 occur because of the different light refraction.

5 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 dental enamel.

The dental enamel has no cells included and therefore cannot be regenerated.

To comment on this article, please login..

Click here for creating a new article in the DocCheck Flexikon.

Initial author:

Last authors:

1 rating(s) (5 ø)


You have any questions?
Copyright ©2020 DocCheck Medical Services GmbH | Switch to mobile version
Follow DocCheck: