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Osteoclastic resorption of BAG and dense HA surfaces (a, b) on BAG discs, the pits show a very smooth and uniform surface. c, d on dense HA discs, with a less smooth and uniform surface. e Layer of calcium phosphate (arrow) that exposed the silica layer (*) underneath. f Overview of the resorption pits found on a BAG surface and on (g) a HA surface
