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(a) Typical morphology of sol-gel bioactive glass granules (2% Zn). Granules with sizes of 500 to 1000 μm were selected for use in the cellular tests. ((b) and (c)) Formation of apatite crystallites on the glass granules (2% Zn) after immersion in SBF for 7 days to demonstrate the bone bioactivity of the granules. (c) Enlarged image of (b) (bar: 1 mm). Similar morphology was noticed in other glass compositions.
