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 Indian J Med Microbiol  
 

Figure 3: Scanning electron microscopy and three-dimensional atomic force microscopy images of the Empress Direct composite resin: (a) Negative control group at 7 days; (b) negative control group at 6 months. The surface presented little micromechanical retention and no exposure of filler particles despite the aging process. Scanning electron microscopy images of the Empress Direct composite resin: (c) Sandblasted group at 7 days; (d) sandblasted group at 6 months. The surface presented an irregular appearance due to the Al2O3impact, independent of the aging process. Note the presence of greater porosity at 6 months compared with 7 days

Figure 3: Scanning electron microscopy and three-dimensional atomic force microscopy images of the Empress Direct composite resin: (a) Negative control group at 7 days; (b) negative control group at 6 months. The surface presented little micromechanical retention and no exposure of filler particles despite the aging process. Scanning electron microscopy images of the Empress Direct composite resin: (c) Sandblasted group at 7 days; (d) sandblasted group at 6 months. The surface presented an irregular appearance due to the Al<sub>2</sub>O<sub>3</sub>impact, independent of the aging process. Note the presence of greater porosity at 6 months compared with 7 days