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Magnesium incorporation into primary dental enamel and its effect on mechanical properties
- Source :
- Acta biomaterialia. 120
- Publication Year :
- 2020
-
Abstract
- Cross-sectional study of sound primary dental enamel revealed hardness zonation and, in parallel, significant change in the Mg content below the prismless layer. Mg content is known to play an important role in enamel apatite biomineralization, therefore, Mg ion exchange experiments were carried out on the outer surface of sound primary molars and on reference abiogenic Ca-phosphates using MgCl2 solution. Effects of Mg incorporation on crystal/particle size, ionic ratio and morphology were compared and the observed changes were explained by parallel diffusion and dissolution/reprecipitation processes. Based on depth profile analysis and high resolution electron microscopy of the Mg-exchanged dental enamel, a poorly ordered surface layer of approximately 10-15 nanometer thickness was identified. This thin layer is strongly enriched in Mg and has non-apatitic structure. Below the surface layer, the Mg content increased only moderately (up to ∼3 at%) and the apatite crystal structure of enamel was preserved. As a common effect of the Mg exchanged volume, primary dental enamel exhibited about 20% increase of nanohardness, which is intrepreted by strengthening of both the thin surface layer and the region below due to the decreased crystallite size and the effect of incorporated Mg, respectively.
- Subjects :
- Materials science
0206 medical engineering
Biomedical Engineering
chemistry.chemical_element
02 engineering and technology
Biochemistry
Apatite
Phosphates
Biomaterials
stomatognathic system
Hardness
Humans
Magnesium
Surface layer
High-resolution transmission electron microscopy
Dental Enamel
Molecular Biology
Dissolution
Enamel paint
General Medicine
021001 nanoscience & nanotechnology
020601 biomedical engineering
stomatognathic diseases
Cross-Sectional Studies
chemistry
Chemical engineering
visual_art
visual_art.visual_art_medium
Crystallite
Particle size
0210 nano-technology
Biotechnology
Subjects
Details
- ISSN :
- 18787568
- Volume :
- 120
- Database :
- OpenAIRE
- Journal :
- Acta biomaterialia
- Accession number :
- edsair.doi.dedup.....38deea1f59234a63a786460b6705305f