Eight-year Clinical Evaluation of Two adhesives in Non-carious Cervical Lesions

Objectives: This controlled clinical trial evaluated the 8-year clinical performance of Class V resin composites restored with a two-step self-etch and a two-step total-etch systems. Methods: Seventy-two non-carious cervical lesions in 8 patients (4 male and 4 female) with a mean age of 61.3 years (range 45-78) participated in the study. An enamel bevel was placed and dentin lightly ground, and cavities restored with Clearfil Liner Bond II (LB, Kuraray Medical) or Single Bond (SB, 3M ESPE) in conjunction with a hybrid resin composite (Clearfil AP-X, Kuraray). In the case of 27 cavities for LB, the enamel was pretreated with 37% phosphoric acid for 10 seconds. Each patient received both types of restoration, which were distributed on a random basis. All restorations (37 restorations for LB and 35 restorations for SB) were placed by one dentist. The restorations were blindly evaluated after 8 years using modified USPHS criteria. The data were statistically analyzed using the Fisher's exact test. Results: All but three restorations (which were replaced by crowns after the 2- and 6-year recalls) were evaluated after 8 years. 100% retention rates were recorded for both restorative groups. No secondary caries was detected in association with any restorations. The minor problems were marginal discoloration and gum recession. Superficial and localized marginal discoloration occurred around 29% of the restorations, and gum recession gradually increased up to 39%. There were no significant differences in the marginal integrity between the LB and SB groups. Conclusions: Restorative materials used in this study demonstrated a good clinical effectiveness in the restoration of non-carious cervical lesions for 8 years.