Figure 5

U2OS osteoblast surface coverage and cell number on different implant materials grown in absence (coloured columns) or presence (adjacent black columns) of a challenge by sub-gingival oral bacteria. (a) Surface coverage; (b) number of cells. Error bars indicate standard deviations over triplicate experiments with separately grown cells and bacteria. * Significant (P < 0.05) differences in surface coverages and cell numbers in absence versus presence of a bacterial challenge (black and colored columns respectively) on the same material. # Magnitudes of the differences in surface coverages and cell numbers in absence versus presence of a bacterial challenge on the same material are significantly (P < 0.05) higher than on the other Ti variants. & Magnitudes of the differences in surface coverages and cell numbers in absence versus presence of a bacterial challenge on the same material are significantly higher (P < 0.05) than in the other groups of materials, indicated by the green lines.