Figure 2
Effect of different conditions of AP on the considered dental material. A) Representative AFM height images with scan size S = 30 μm and pixel number N = 5122 after different sample surface treatments. From left to right: control (untreated) specimen (height range 300 nm), specimen after AP for 5 s at a distance of 2 mm from the surface with bicarbonate (height range 2200 nm), and specimen after AP with the same time and distance but with glycine powder (height range 800 nm). B) Mean surface roughness <Rq> of all samples, both controls and treated with AP at different combinations of powder (sodium bicarbonate, BIC, in red, or glycine, GLY, in green), time, and distance. Each value for a single sample is the mean of n = 8 values measured by AFM. Left half (light colors): time evolution of Rq for both abrasive powders at a spraying distance of 2 mm from specimen surface; right half (dark colors): time evolution of Rq for both abrasive powders at a spraying distance of 7 mm from specimen surface. * p < 0.05, ** p < 0.01.