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

Figure 3

TEM observations of the interface between Clearfil Protect Bond and dentin after acid-base challenge ((a) ×5,000, (b) ×50,000, (c) ×50,000). B: bonding resin; D: dentin; H: hybrid layer; OL: outer lesion. An ABRZ (finger pointers) was observed beneath the hybrid layer (H) at lower magnification (a). Apatite crystals were sparce at the top of the ABRZ (b), while apatite crystals at the middle of the ABRZ were much greater in quantity (b). The thickness of the ABRZ was approximately 1.0-1.2 μm.

(a)

(b)

(c)