Objectives . The use of self-etching adhesives (SEA) increases the dentin shear bond strength (dSBS) of resin modified glass ionomers (RMGI) . The purpose of this study was to compare the dSBS of SEA + RMGI combination with the SEA + composite resin combination, and then to test the effects of water and saliva contaminations on dSBS for this association at various stages of bonding.
Materials and methods . 90 human teeth with a flat surface of dentin were embedded in blocks of resin. 80 cylinders of RMGI (Fuji LCII ® ( GC )) were bonded on 80 teeth according various modalities: 10 were bonded on no-treated dentin, 10 after polyacrylic acid treatment, 10 after application of SEA (IBond ® self-etch ( Heraeus )), 10 after water contamination followed by an application of SEA, 10 after saliva contamination followed by an application of SEA, 10 after application of SEA followed by water contamination and 10 after application of SEA followed by saliva contamination. After all these steps 10 cylinders of composite (Z100 ® ( 3M Espe )) were bonded on dentin after application of SEA. The dSBS was determined in a universal testing machine and the type of bond failure (mixte/adhesive/cohesive) was noted. A Kruskal–Wallis test was performed followed by Games–Howell post-hoc pairwise comparison tests on the dSBS results ( p < 0.05). A chi-square test was used for the analysis of bond failure ( p < 0.05).
|Dentin treatment and material||Dentin SBS (MPa)|
|RMGI||5 ± 1.3 (a)|
|Polyacrylic acid + RMGI||8 ± 1.6 (b)|
|SEA + RMGI||15 ± 2.4 (c)|
|SEA + composite||18 ± 8.2 (c)|
|Saliva + SEA + RMGI||20 ± 7 (c)|
|SEA + saliva + RMGI||19 ± 6 (c)|
|Water + SEA + RMGI||16 ± 2 (c)|
|SEA + water + RMGI||21 ± 4 (c)|