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In an effort to decrease the aggregation of tetracalcium phosphate (TTCP, Ca 4 (PO 4 ) 2 O) in composites and develop better bone substitute materials, a series of poly(l-lactic acid) (PLLA)-grafted TTCP (g-TTCP) particles were prepared by a ring-opening polymerization with l-lactide (the monomer for synthesizing PLLA) in the presence of catalyst stannous octoate [Sn(Oct) ...