Fig. 8. Blood vessel quantification in tissues surrounding different implants at day 1, 3, 7, 14, 28 after implantation. (a) Qualitative evaluation; (b) and (c) quantitative assessment of blood vessels around the implants. *, p < 0.05; **, p < 0.01; ***, p < 0.0001; ns, no significant difference. Black arrows indicate blood vessel. Scale bar: 100 μm.