24-Month Clinical Performance of a Universal Adhesive 
on Non-Carious Cervical Lesions: Self-Etch and Etch-and-Rinse Techniques

Purpose: To evaluate the 24-month clinical performance of Adhese Universal (ADH) (Ivoclar Vivadent) using two different application modes (etch-and-rinse vs self-etch) when restoring non-carious cervical lesions.
Materials and Methods: Twenty-six patients participated in this study. A total of 117 non-carious cervical lesion restorations (N = 117) were assigned to two groups: 1) ADH in the etch-and-rinse mode (n = 59) and 2) ADH in the self-etch mode (n = 58). The same resin composite (Tetric EvoCeram, Ivoclar Vivadent) was used for all restorations. The restorations were evaluated at baseline and at 24 months using the World Dental Federation (FDI) criteria. The results were analyzed statistically using the McNemar test (α = 0.05) and a generalized estimating equation.
Results: In self-etch mode, significant differences were found for marginal coloring (p = 0.002), marginal adaptation (p = 0.031), and hypersensitivity (p = 0.031) between baseline and the end of the 24-month period. In the etch-and-rinse mode, significant differences were found for marginal coloring (p = 0.004), fractures/retention (p = 0.002), marginal adaptation (p = 0.002), and hypersensitivity (p = 0.000). Significant differences were also detected between groups at 24 months for fractures/retention (p = 0.001). At 24 months, 10 restorations of the etch-and-rinse group were lost and 2 restorations of the self-etch group were lost.
Conclusion: In terms of fractures and retention criteria, this universal adhesive obtained better results when applied in self-etch mode than in etch-and-rinse mode.