Abstract
Objective: to analyze the immediate shear bond strength and after a period of aging to zirconia restorations using adhesive systems available in our market that contain the 10-MDP molecule in their composition.
Methodology: 20 sintered zirconia specimens were randomly divided into 4 groups according to the chemical conditioning system to be used (Z Prime Plus, Peak ZM, Single Bond Universal, Tetric N-Bond Universal), which were applied following the manufacturer's instructions. The Zirconia surface was pretreated with aluminum oxide sandblasting of 50 micrometers in size, for 15 seconds at a distance of 10 mm and a pressure of 0.25 MPa. Subsequently, the corresponding chemical conditioning agent was applied and finally 4 dual resinous cement buttons were made. 2 of the 4 buttons were subjected to the microshear test immediately after 24 hrs. The specimens were then stored in distilled water at 37ºC for 6 months and after that period the remaining 2 buttons were subjected to microshearing. The results obtained were analyzed using a 2-way ANOVA and a Tukey posthoc test.
Results: No significant differences were found when analyzing the chemical conditioning system factor or when analyzing the aging factor. When analyzing the factors independently, no differences were found between any of the materials at 24 hours; however, at 6 months the Z Prime Plus group presented a statistically significant decrease.
Conclusions: The results of this in vitro study suggest that universal adhesives with 10-MDP present an immediate bond strength similar to specific chemical surface conditioners for zirconia. After a period of aging, universal adhesives appear to have better stability in bond strength.
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