Abstract: Objective　To evaluate the effect of silicon coating prepared by sol-gel self-assembling on instant bond strength of zirconia ceramic and resin. Methods　56 zirconia ceramic slices were obtained and randomly divided into 4 groups based on the surface treatment to be applied: groupA: silane couple agent; group B: sol-gel impregnated with 1 layer of silicon coating and silane couple agent; group C: sol-gel self-assembly 2 layer silicon coating + silane coupling agent; group D: sol-gel self-assembly 3 layer silicon coating and silane couple agent. 56 photo-cure composite resin columns were prepared and bonded on the zirconia ceramic by resin cement. Bonded specimens received shear bond strength testing after 24-hour water storage. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were used to characterize the zirconia of different surface treatments, and the sample fracture mode was recorded by the stereoscopic microscopy. Results　The shear bond strength values of group A, B, C, D were respectively (3.05±0.26) MPa, (6.83 ±0.33) MPa, (10.51 ± 0.58) MPa and (7.72±0.35) MPa. There was no statistical difference between group B and group D, while all the other groups were statistically significant (P=0.000).The shear bond strength obtained by self-assembly of two silicon coatings was the largest. Conclusions　Sol-gel self-assembled silicon coating can improve the adhesion strength of zirconia ceramics. The result of sol-gel self-assembling 2-layer silicon coating group is the best.

Key words: Se1f-aasembly, Silicon coating, Dental zirconia ceramic, Bond strength