Figure 6.

SEM evaluation of hybrid layer observed at 1000×, a: Control group with irregular deposition of crystals with many dentinal tubules opening, b: nHAP group with fewer dentinal tubules and irregular deposition of apatite, c: Chi-nHAP group shows uniform deposition of apatite but with few dentinal tubule openings, d: MS -nHAP group shows uniform deposition of apatite crystal on the surface without any evidence of dentinal tubules openings (hydroxy apatite nanoparticles (nHAP); chitosan+ hydroxy apatite nanoparticles (chi-nHAP); mesoporous silica+ hydroxy apatite nanoparticles (MS-nHAP))