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.
MeSH terms
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Biocompatible Materials*
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Calcium / chemistry*
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Calcium Phosphates / chemistry*
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Dental Cements / chemistry*
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Durapatite / chemistry
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Hydrogen-Ion Concentration
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Ions
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Magnesium / chemistry
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Phosphates / chemistry*
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Potassium / metabolism
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Potassium Compounds / chemistry
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Sodium / metabolism
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Time Factors
Substances
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Biocompatible Materials
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Calcium Phosphates
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Dental Cements
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Ions
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Phosphates
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Potassium Compounds
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alpha-tricalcium phosphate
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tetracalcium phosphate
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calcium phosphate, monobasic, anhydrous
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Durapatite
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calcium phosphate
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Sodium
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potassium phosphate
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Magnesium
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calcium phosphate, dibasic, anhydrous
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Potassium
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sodium phosphate
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Calcium