Fig. 8
Statistical analysis (t-test) of proteins and collagen secondary structure in gingival portions adjacent to laser-treated (LASER) and machined (MACHINED) surfaces: α-helix structures (A1665+1654/AAI), proline (A1342/Atot), triple helix structures (A1638/AAI and A1284+1240/Atot), and random coil structures (A1644/AAI and A1263/Atot). Data are shown as mean ± SD; asterisks over histograms indicate statistically significant differences (*p < 0.05; **p < 0.01; ***p < 0.001 and ****p < 0.0001)