Abstract
In this study, the dependence of inorganic filler on apatite-forming ability in simulated body fluid (SBF) was investigated for the composite cements of bioactive CaO-SiO2-P2O5-CaF2 glass, glass-ceramic A-W or sintered hydroxyapatite powders combined with bisphenol-a-glycidyl methacrylate/triethyleneglycol (Bis-GMA/TEGDMA) resin. All the composite cements showed apatite-forming ability, but with different rate of apatite formation and surface structure. The first one formed the outermost continuous apatite layer in the shortest period, but simultaneously formed a less dense layer under the apatite layer. The second one similarly formed an outermost continuous apatite layer without forming the low density layer, although the rate of apatite formation was somewhat slower compared with that of the first one. The third one discontinuously formed apatite only on individual hydroxyapatite grains. Such different characteristics among the inorganic fillers may determine both the bioactivity and the mechanical strength of the composite cements in vivo.
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