One-year clinical comparison of two all-in-one adhesives in non-carious lesions

Objectives: The aim of this study was to evaluate the retention and marginal staining over 1y of restorations bonded with Clearfil S3 and Clearfil ST resin composite (Kuraray Medical, Japan) or G-Bond and Gradia Direct Anterior resin composite (GC Corp, Japan) all-in-one adhesive systems placed in non-carious cervical lesions. Materials and Methods: Sixty restorations (7 molars, 28 premolars, 25 anteriors) were placed in 11 subjects, mean age 62.5 years. Approval was obtained from the Human Ethics Committee of the University of Melbourne. Restorations were bonded and placed according to the manufacturers' instructions. No enamel etching was performed on margins prior to restoration placement. Patients were recalled at 6 m and 1y; all restorations were evaluated for presence and marginal staining. Photographic records were obtained prior to restoration, immediately after and at recall. Results: All patients could be recalled. All restorations were present at both recall periods. A 100% retention rate was obtained. Slight marginal staining was observed on four restorations for S3 and three restorations for G-Bond. Discussion: This is one of the few trials that have compared all-in-one adhesive systems to restore non-carious cervical lesions. The two systems are somewhat different in their chemistry, particularly in that G-Bond does not contain HEMA and is a 4-methacryloxyethyl trimellitic acid (4-MET) based system compared with the functional monomer of S3 which is 10-MPD. The degree of marginal staining was no different between the materials. Staining was most commonly observed at the distal margin where the resin composite was thinnest. It is possible the resin had lifted off during polymerization, as well as being more difficult to finish restorations in this location. Conclusion: The early results of this evaluation are showing good outcomes for both materials in NCCL.