Fig. 3

SEM images of all groups after the last treatment (d3). Specimens after treatment with the oral irrigator WF (a,b), the active sonic toothbrush WPa (c,d), the inactive sonic toothbrush WPi (e,f), the control group CO without treatment (g,h) and specimens without bacteria (i,j). Areas with shorn-off biofilm are shown in a) and b). Magnifications of 45x (a,c,g,e,I; scale bar = 100 μm) and 500x (b,d,f,h,j; scale bar = 10 μm) were used