Statistical analysis of microarray plot (SAM) of MG63 treated for 24 hours with PerioGlas at the concentration of 0.04 g/mL. Expected differentially expressed genes are reported in the x axis whereas observed differentially expressed genes are in the y axis. Downregulated genes (green dots) are located in the lower left-hand side of the diagram; upregulated genes (red dots) are in the upper right-hand side; genes with different expression that are not statistically significant differences are black dots. Blue parallel diagonal lines represent the cutoff limits; the middle diagonal line indicates the equal value of observed and expected differentially expressed genes