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Effect of polymerization mode and time of adhesive system on microleakage in composite resin restorations
Giulliana P Soares1, Gustavo G Silva, Glaucia M B Ambrosano
1Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil.
Aim:
To quantify the microleakage on restorations carried out with a two-step etch-and-rise adhesive system and nanofilled composite resin after thermal and mechanical loading cycling.
Methods:
Ninety cavities were prepared on proximal surfaces of incisive teeth, and were randomly divided according to the photoactivation time (10, 20, or 30 s) and light-curing mode (Quartz Tungsten Halogen (QTH) lamps, 450 mW/cm(2); Light Emitting Diode (LED) second generation, 1100 mW/cm(2); or LED third generation, 700 mW/cm(2)) of an adhesive system (n = 10). Following restorative procedures and thermal and mechanical loading cycling, the samples were immersed in Methylene Blue for 2 h. The samples were ground, and the powder was prepared for analysis in an absorbance spectrophotometer. All results were statistically analyzed by anova and Tukey's test at the 5% level of significance.
Results:
There were no significant statistical difference in microleakage between the light-curing mode (P = 0.1212) and light-curing time (P = 0.2043).
Conclusion:
Different curing modes and increasing the curing time were not factors that influenced the process of microleakage.
