Figure 4. TEM micrographs of non-stained, non-demineralized, silver-impregnated sections, illustrating interfacial nanoleakage of G-Bond bonded to 4 types of dentin: superficial perpendicular dentin (A), deep perpendicular dentin (B), superficial parallel dentin (C), and deep parallel dentin (D). On each micrograph: A, filled adhesive; D, dentin; DT, dentinal tubule; H, hybrid layer; T, resin tag. Open triangles show fillers from bonding resin; asterisks indicate the smear layer remnant. The silver deposits within the hybrid layer consisted mainly of scattered dots of metallic silver. In addition, a typical reticular type of silver penetration could be found within the zone directly beneath the hybrid layer in all 4 dentin characteristics (solid arrows). (B) Increased size and density of silver impregnation (hand pointers) within both the hybrid layer and the adhesive layer compared with (A), (C), and (D). In addition, very distinct nanoleakage could also be found within a resin tag in (B).