Objective:

To analyze the immediate shear bond strength and the strength after a period of delay to zirconia restorations using adhesive systems available in our market containing the 10-MDP molecule.

Methodology:

Twenty sintered zirconia specimens were randomly divided into four groups based on the chemical conditioning system used (Z Prime Plus, Peak ZM, Single Bond Universal, and Tetric N-Bond Universal), which were applied following the manufacturer's instructions. The zirconia surface was pretreated with 50-micrometer aluminum oxide sandblasting for 15 seconds, at a distance of 10 mm and a pressure of 0.25 MPa. The corresponding chemical conditioning agent was then applied, followed by the fabrication of four dual resin cement buttons. Two of the four buttons underwent microshear testing 24 hours after preparation. Subsequently, the specimens were stored in distilled water at 37°C for six months, after which the remaining two buttons were subjected to microshear testing. The results were analyzed using two-way ANOVA and Tukey's post hoc test.

Results:

No significant differences were observed when analyzing the chemical conditioning system nor the delay factor. When the factors were analyzed separately, no differences were found between the materials at 24 hours; however, at 6 months, the Z Prime Plus group showed a statistically significant decrease.

Conclusions:

The results of this in vitro study suggest that universal adhesives with 10-MDP exhibit an immediate bond strength similar to that of zirconia-specific chemical surface conditioners. After a period of delay, universal adhesives appear to have better stability in bond strength.

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