Figure 2. Scanning electron micrographs of G-Cem (A), Rely X Unicem (B), Multilink Sprint (C), Calibra (D), Panavia F 2.0 (E), and Bis-Cem (F). When the multi-step resin cement (Calibra) was used, dentin was demineralized and consecutively infiltrated by resin. Resin tags and a resin cement/hybrid zone are identified. When luted with self-adhesive cements, tubules were not infiltrated by resin, but intimate adaptation was seen, and no distinct morphological manifestation of interaction with dentin was observed.