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Effect of NACP filler level on ion release from nanocomposite. Ca and PO4 concentrations (mean ± sd; n = 3) at 28 d are plotted vs. NACP filler level. The ion release increased with NACP filler level at a rate faster than being linear, suggesting that the higher ion release resulted from not only an increase in the source of release, but also a higher interfacial area in the composite facilitating the water diffusion and ion release.
