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Concentration of type I collagen in HGFs after 7 days.
Note: *P<0.05, **P<0.01, ***P<0.001.
Abbreviations: HGFs, human gingival fibroblasts; SLM, selective laser melting; MP, mechanically polished; AO, anodic oxidation; AOC, anodic oxidation composited with electrochemical deposition.
