Correlation between Hybrid layer, Tags and Bond Strength to dentin

OBJECTIVE: This study measured the hybrid layer, length of resin tags, their bond strength to intact dentin tissue, as well as the correlation among these factors, using conventional and self-etching adhesive systems. METHODS: After the restorative procedures, each specimen was sectioned in mesiodistal direction. One section was submitted to analysis of resin tags and hybrid layer by light microscopy analysis (AXIOPHOT, 400X), and the other section was submitted to the microtensile test (0.5 mm/min). The fractured surface was analyzed and classified as to the fracture pattern by scanning electron microscopy analysis. The means of factors hybrid layer, tags and microtensile of the study groups were submitted to statistical analysis and the correlation test. RESULTS: Statistically significant difference was observed for the factor hybrid layer when analyzed in isolation, with better performance for the material Single Bond 2, as well as for the material Adper Prompt L-Pop concerning the analysis of resin tags. Similarly, the material Single Bond 2 was statistically better than Adper Prompt L-Pop on the microtensile test. CONCLUSION: The conventional adhesive system exhibited highly positive correlation between hybrid layer thickness and resistance analyzed by the microtensile test.