Eighteen-month clinical evaluation of a filled and unfilled dentin adhesive

Objective: The purpose of this study was to evaluate the performance of a f illed (Opti Bond Solo) and an unfilled (Prime & Bond 2.1) "onebottle" adhes ive in Class V restorations after 18 months of clinical service. Methods: Thirty-three patients with non-carious cervical lesions were enrol led in the study. A total of 101 lesions were restored using one of the adh esives and a hybrid composite resin. Enamel wets not beveled, nor was any m echanical retention placed. The restorations were evaluated at baseline, an d at 6 and 18 months after placement using modified USPHS criteria. Results: Cumulative 18-month retention rates were 93.6% for OptiBond Solo a nd 98.0% for Prime & Bond 2.1.The difference in retention rates was not sta tistically significant. For OptiBond Solo, the only notable problems were i nterfacial staining and marginal adaptation, both of which were less than i deal in 9% of restorations. Marginal problems were slightly less frequent f or Prime & Bond 2.1 restorations, but the difference was not significant. Conclusions: Both adhesives provided Class V retention rates exceeding the 18-month, full acceptance guidelines set by the American Dental Association . Any additional benefit provided by the use of a filled adhesive was not d etected in this 18-month clinical trial. (C) 2001 Elsevier Science Ltd. All rights reserved.