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. 2015 Jul 15;8(7):10793–10803.

Figure 2.

Figure 2

Cross-sectional image of the DHL (FESEM images of pretreatments on adhesive treatment groups): A. PA: DHL is uniform and dense, high density regions are visible at the bottom of the DHL where exposed collagen fibers marked by gold nanoparticles (2,000×); B. part of the exposed collagen fibers at the bottom of the DHL can be clearly seen (8,000×); C. CA: DHL is more uniform and dense, high density regions are visible at the bottom of DHL where exposed collagen fibers are indicated by gold nanoparticles (2,000×); D. few exposed collagen fibers at the bottom of the DHL can be seen (8,000×); E. MA: DHL is more uniform and dense, with no obvious boundary between the bonding agent layer and the hybrid layer, high density regions are less visible at the bottom of the hybrid layer where exposed collagen fibers are indicated by gold nanoparticles (2,000×); F. few exposed collagen fibers at the bottom of the DHL can be seen (8,000×) (A: adhesive D: dentin hybrid layer R: resin tag).