Fabrication of Biporous Low-crystalline Apatite Based on Mannitol Dissolution from Apatite Cement

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Biporous (macro- and microporous) calcium phosphate gains much attention as a bone substitute material because of its large surface area and that it improves cell penetration. In the present study, we evaluated the feasibility of biporous, low-crystalline apatite based on dissolution of mannitol from self-setting apatite cement (Biopex). Mannitol-known as a biocompatible, easily dissolved monosaccharide alcohol-was recrystallized to obtain larger crystals. It was crushed with pestle and mortar, sieved to obtain crystals which passed through a 500μm mesh but which remained against a 300-μm mesh, and then used as porogen. Although Biopex containing 60 wt% mannitol was not able to be taken out of the mold, addition of mannitol caused no initial setting inhibition to Biopex if the amount was 40 wt% or less. Similarly, transformation to apatitic product was confirmed when the apatite cement was immersed in 0.9% saline kept at 37℃ for seven days. The set mass became low-crystalline, biporous apatite with approximately 60% porosity.
日本歯科理工学会の論文