The effect of composition on the reactivity of a calcium phosphate cement (CPC) consisting of tricalcium phosphate (TCP)–water mixtures was investigated by isothermal calorimetry at 37 °C. The parameters of interest were the mean particle size of the powder, the use of small amounts of hydroxyapatite nanoparticles as nucleating agent, the phosphate concentration and the pH of the aqueous solution. Interactions of various parameters were also investigated. The results show that the main parameter controlling CPC reactivity was TCP particle size, because in contrast to other parameters it markedly reduced the total reaction time.
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Bohner et al. (2008) studied this question.
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