Longevity of a single-dose, dual-cure universal adhesive: A 7.5-year double-blind split-mouth two-center randomized...

To evaluate the clinical performance of a universal adhesive (Futurabond U, Voco) when applied using different bonding techniques in non-carious cervical lesions (NCCLs) after 7.5 years.

In two clinical centers, two hundred restorations (n = 50 per group) were randomly placed in 50 participants with at least four NCCLs, using four adhesive strategies: self-etch only (SEE); selective enamel etching + self-etch (SET); etch-and-rinse with dry dentin (ERDry); and etch-and-rinse with wet dentin (ERWet). Restorations were evaluated at baseline and after 6 months, 1, 3, 5 and 7.5 years using the FDI and USPHS criteria for material fracture and retention (primary outcome), along with marginal staining, marginal adaptation, post-operative sensitivity, and caries at restoration margins (secondary outcomes). The survival rates of the different groups were calculated by the Kaplan-Meier analysis and log-rank test. For secondary outcomes, differences between groups were assessed using Kruskal Wallis and Mann-Whitney test (α = 0.05).

After 7.5 years, with a recall rate of 84 %, a total of 135 restorations were analyzed (SEE 33, SET 34, ERDry 34, and ERWet 34). Thirty-two restorations loss retention (SEE 9, SET 8, ERDry 8, and ERWet 7). Retention rates (95 % confidence interval) were 72.7 % (55.8-84.9) for SEE, 76.5 % (60.0-87.6) for SET and ERDry, and 79.4 % (63.2-89.6) for ERWet (p > 0.05). Sixteen restorations (SEE 7, SET 5, ERDry 2, and ERWet 2) showed minor marginal staining, and twenty-eight restorations (SEE 12, SET 5, ERDry 5, ERWet 6) presented minimal marginal adaptation defects (p > 0.05). One restored tooth (ERWet) showed caries at the restoration margin (p > 0.05).

The clinical performance of a universal adhesive in NCCL restorations was satisfactory after 7.5 years, regardless of the bonding technique.

NCT03244124.