Effects of Two Different Acid Etching and Surface Washing Methods on Bond Strength on Different CAD-CAM Blocks under Aging Protocols

Figure 4

SEM images after surface treatments on Celtra Duo material: (a) HF + W ×5000, (b) HF + PA ×5000, (c) HF + US ×5000, (d) MEP + W ×5000, (e) MEP + PA ×5000, (f) MEP + US ×5000, (g) HF + W ×1000, (h) HF + PA ×1000, (i) HF + US ×1000, (j) MEP + W ×1000, (k) MEP + PA ×1000, and (l) MEP + US ×1000.