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Combinations of citrate (C6H5O 73-− ), pyrophosphate (P2O 74− ) and sulfate (SO 42− ) ions were used to modify the physico-chemical properties of a calcium phosphate cement (CPC) composed of β-tricalcium phosphate (β-TCP) and phosphoric acid (PA) solution. The results obtained with only one additive at a time are similar to those previously published. New facts are: the positive effect of C6H5O...