The Ca/P range of nanoapatitic calcium phosphate cements.
basic_science · Level V
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- Record sourced from PubMed, PMID 12162334.
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Abstract
Nanoapatites are apatites consisting of nanometer size crystals. The commercial calcium phosphate cements set by the precipitation of nanoapatitic calcium phosphates in the range 1.5 < or = Ca/P < 1.8. In this study it is shown that a continuum of nanoapatites can precipitate in the range 0.8 < Ca/P< or = 1.5. In order to be formed these nanoapatites need to incorporate K+ ions. In addition they can incorporate some Na+ ions. Upon immersion in aqueous solutions these nanoapatites loose phosphate, K+ and Na+ so that in an open system they are transformed into calcium deficient hydroxyapatite Ca9(HPO4)(PO4)5OH within about 2 months.
Medical subject headings
- Biocompatible Materials
- Calcium
- Calcium Phosphates
- Dental Cements
- Phosphates