Figure 2.
Scanning electron microscope images of surface micromorphology of adhesive layers at the end of 1 day and 6 months. In (a) conventional nanofilled dentin bonding agent did not penetrate completely into the acid-etched dentin, leaving some open dentinal tubules (arrows). (d) At the end of 6 months conventional nanofilled dentin bonding agent was disappeared maximum number of tubules were devoid of resin plugs (arrows). In (b) nanoHAP incorporated dentin bonding agent penetrated completely with thin homogenous distribution of the nanoparticles (arrows). (e) After 6 months, storage in nanoHAP-incorporated dentin bonding agent group showed intact bonding agent with minute amount of mineral/crystalline (arrows). (c) Si-nanoHAP-incorporated dentin bonding agent penetrated completely with thick homogenous distribution (arrows) of the nanoparticles on the adhesive layer. (f) After 6 months Si-nanoHAP-incorporated dentin bonding agent adhesive layer showed stellate-shaped insoluble complexes of silica-rich domains on the surface (arrow)