Fluoride-Releasing Self-Etch Adhesives Create Thick ABRZ at the Interface

Figure 4

SEM observation of the interface between Fluorobond II and dentin after acid-base challenge (× 3,500). The different sizes of the S-PRG filler particles (white arrows) were observed in the adhesive resin (B). The ABRZ was sloped from the top to the bottom, as it approached the underlying dentin. B: bonding resin; D: dentin; H: hybrid layer; OL: outer lesion.