The Ca/P range of nanoapatitic calcium phosphate cements.
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.
Driessens
F C M
FC
University of Nijmegen, Ohe en Laak, The Netherlands.
Boltong
M G
MG
de Maeyer
E A P
EA
Wenz
R
R
Nies
B
B
Planell
J A
JA
D001672:Biocompatible Materials; D002118:Calcium / Q000737:chemistry*; D002130:Calcium Phosphates / Q000737:chemistry*; D003738:Dental Cements / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007477:Ions; D008274:Magnesium / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry*; D011188:Potassium / Q000378:metabolism; D017680:Potassium Compounds / Q000737:chemistry; D012964:Sodium / Q000378:metabolism; D013997:Time Factors
D001672:Biocompatible Materials; D002130:Calcium Phosphates; D003738:Dental Cements; D007477:Ions; D010710:Phosphates; D017680:Potassium Compounds; C485828:alpha-tricalcium phosphate; C485830:tetracalcium phosphate; C485838:calcium phosphate, monobasic, anhydrous; D017886:Durapatite; C020243:calcium phosphate; D012964:Sodium; C013216:potassium phosphate; D008274:Magnesium; C485829:calcium phosphate, dibasic, anhydrous; D011188:Potassium; C018279:sodium phosphate; D002118:Calcium