Statement of problem: polymer infiltrated ceramic network or hybrid ceramics are a combination of infiltrating polymerizable organic monomers into a pre-sintered porous ceramic matrix. In addition to having good mechanical properties, the polymer infiltrated ceramic network must comply with the possibility of adequate bonding to the resinous cement. The surface conditioning of this hybrid material must be carefully considered due to its organic composition and ceramic network. Purpose: to evaluate the effect of hydrofluoric acid and a self-etching ceramic primer, in two application times, on the bond strength of a polymer infiltrated ceramic network. Materials and methods: sheets of a polymer infiltrated ceramic network were obtained and randomized in 5 groups. The group AAS (air-abrasion with Al2O3 of 50µm), groups HF2 and HF6, hydrofluoric acid for 20 and 60 seconds respectively was used and for the groups MB2 and MB6, a self-etch ceramic primer was applied for 20 and 60 seconds respectively. A silane was applied after the treatment of the groups AAS, HF2, and HF6. A micro-shear bond strength test at to universal mechanical testing machine was performed, after 24-hour storage in distilled water. All samples were evaluated in a stereomicroscope at 40x and 50x to determine the type of failure. Results: the highest and lowest values of bond strength were reported by groups MB6 and AAS, respectively. The groups (HF2, HF6, MB6, and MB2) did not report statistically significant differences. The predominant failure pattern was a mixed failure. Conclusions: with the limitations of the present investigation, the treatments of self-etching ceramic primer and hydrofluoric acid followed by silane were reported to be statistically equal at 20 and 60 seconds

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