the effect of sandblasting and coating of zirconia by nano composites on bond strength of zirconia to resin cements

Statement of the problem: despite yttria-stabilized tetragonal zirconia polycrystal (y-tzp) high strength in dental restoration application, zr- the framework has a low tendency to react chemically with cement which is the main reason of these restoration failures. purpose: the aim of this in vitro study was to evaluate the effect of y-tzp coating by nano-composite of silica and aluminosilicate according to the sol-gel dip-coating technique on the bond strength of resin cement to y-tzp. materials and method: in this experimental study, y-tzp blocks (10×10×3mm^3 ) were pre-pared and sintered and assigned into 4 groups (n=10) for coating including control group with-out any further surface treatment, sandblasted using 110 μm alumina particles under 2.5 bar and tip distance of 10 mm, silica sol dip coating + calcination, aluminosilicate sol dip coating+ calcinations. to confirm chemical bonds of sol-gel covers, fourier transforms infrared spec-troscopy (ft-ir) technique was used. the surface of the sample was investigated by scanning electron microscopy (sem), energy-dispersive spectroscopy detector (eds) and x-ray diffrac-tion (xrd) methods. micro-shear bond strengths (μsbs) of zirconia-cement specimens were evaluated. data were analyzed with a one-way anova test in spss version 11.5 software with a confidence interval of 95%. results: μsbs of sandblasting, nano-silica, and nano-aluminosilicate specimens were signifi-cantly higher than control. μsbs of nano-silica was higher than other groups but no significant difference was observed in μsbs of sandblasting nano-silica, and nano-aluminosilicate groups (p> 0.05). conclusion: covering the zirconia surface with non-invasive nano-silica and nano-aluminosilicate using the sol-gel technique leads to improved cement bond strength.