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SEM images and size distribution graph of fabricated hydroxyapatite microbeads. A, B SEM images showing spherical microsized hydroxyapatite beads. A rough surface was produced on the microbeads. Scale bar = 500 μm (×100 image) and 100 μm (×500 image). C Size of microspheres was measured at 89.6 ± 16.1 μm, and the size distribution of the microbeads was relatively narrow. D XRD data showed hydroxyapatite was successfully sintered by heat treatment, which had high crystallinity
