Bond strength of self-etching adhesive systems on unground and ground enamel

The objective of this study was to evaluate the microshear bondstrength of all-in-one self-etching adhesive systems on unground andground enamel, and discuss some concepts involving these adhesivesin enamel. Seventy eight bovine incisors were prepared, using siliconcarbide papers, to obtain samples of unground and ground enamel(150mm2). The adhesives Adper Single Bond 2 (3M Espe), One-UpBond F Plus (Tokuyama Dental) and Hybrid Bond (Sun Medical)were applied, and Tygon tubing positioned over each sample ofhybridized enamel (n=13). The interior space was filled in with Z250(3M Espe) composite. After photoactivation, the tubes were removedand samples were exposed, which were stored in distilled water at37oC for one week. After this period, the samples were bonded tothe test device, and tested in a universal testing machine (EMIC DL500), with a speed of 0.5mm/min. The bond strength was calculatedin MPa and the data analyzed statistically by Anova and Tukey’s test(p<0,05). The results indicate that teeth with ground enamel resultedin higher bond strength to all adhesives tested. The adhesive AdperSingle Bond 2 showed higher bond strength and statistical differencecompared to all-in-one adhesives, that didn’t show statisticaldifference among themselves.