O. Bermudez et al., OPTIMIZATION OF A CALCIUM ORTHOPHOSPHATE CEMENT FORMULATION OCCURRINGIN THE COMBINATION OF MONOCALCIUM PHOSPHATE MONOHYDRATE WITH CALCIUM-OXIDE, Journal of materials science. Materials in medicine, 5(2), 1994, pp. 67-71
In a previous study it has been found that mixtures of monocalcium pho
sphate monohydrate MCPM and calcium oxide CaO set upon mixing with wat
er. In this study it was found that the optimum composition for such a
mixture is a Ca/P molar ratio of 1.35 +/- 0.02. The milling procedure
for preparation of the powder of this cement was also optimized. The
optimum water/powder ratio appeared to be 0.53 +/- 0.01. Amounts of pr
ecipitated hydroxyapatite up to 7% by weight increased the compressive
strength and the diametral tensile strength of the cement. The maximu
m values found for these properties were 6 and 1.6 MPa, respectively.
Finally, it was found that the cement obtained its maximum strength wi
thin 5 h but this diminished upon further soaking in Ringer's solution
at 37-degrees-C until after 10 weeks of soaking the strength was decr
eased to 62% of the maximum value.