Comparison of interfaces dentine universal adhesives applied with different dental treatments

Objective: To compare the bonding interfaces between dentin and universal adhesives applied with treatments of total etching and autoconditioning in different walls and depths in dentin. Methods: In 24 third molars simple occlusal deep cavities were carved. They were divided according to the treatment: total etching + self-conditioner and the universal adhesive: Total etching technique + Monobond 7 SE, Group 1. Monobond 7 SE, Group 2. Total etching technique + Onecoat 7 universal, Group 3. Onecoat 7 universal, Group 4. Total etching technique + universal single bond, Group 5. Single universal bond, Group 6. In total etching groups, it was conditioned with 35% phosphoric acid enamel and dentin for 10 seconds and the universal adhesive was applied. For the self-conditioning protocols, universal adhesives were applied on enamel and dentin. The samples were obtured with Filtek bulk fill, by oblique incremental technique and polymerized for 20 seconds each layer with a LED unit. They were cut and polished to be visualized with a Lext 3D microscope and processed with the image Pro Plus V morphometry software. 4.52. The areas of desadaptation were measured on paths of 50 μm in length in the lateral and pulp walls. The data was contrasted using a Univariate analysis model. Results: The desadaptation values, mean and standard deviation were expressed in micrometers between total etch technique (1.48 ± 1.20) and self-conditioning (1.49 ± 1.24) all groups did not show significant differences (p?0.05). Significant differences were found between the different universal adhesives (p<0.05): Monobond 7 SE 0.98 ± 0.57; Onecoat 7 universal 1.52 ± 1.27, Universal Single Bond adhesive 1.92 ± 1.42. The greatest desadaptation respect to the cavitary walls was 1.79 ± 1.51 in the pulp wall, followed by 1.41 ± 1.17 in lateral deep dentin wall, 1.32 ± 1.03 and in superficial dentin and in medium dentin lateral wall 1.27 ± 0.79 with significant differences between pulp and the rest (p<0.05). Conclusion: It could be established that the total etch and self-conditioning protocols did not register significant differences of desadaptation values with the different universal adhesives analyzed.