Marginal sealing durability of two contemporary self-etch adhesives

Abstract

Introduction. Sealing abilities of two self-etch adhesives were evaluated after two aging processes: storage in water and thermocycling. Materials and Methods. Cl V cavities were prepared on the buccal and lingual aspects of 48 human premolars, with cervical margins 1 mm below the CEJ. Clearfil Protect Bond (CPB) and BeautiBond (BB) (two-step and one-step self-etch adhesives, resp.) were applied, each to half of the cavities and restored with composite resin. Each group was randomly subdivided into 4 subgroups (n = 12) and evaluated for dye penetration after 24 hours, after 3000 thermocycling rounds, after a 6-month water storage, and after 3000 thermocycling rounds plus 6-month water storage, respectively. Data was analyzed using SPSS 11.5 and Kruskal-Wallis and Mann-Whitney U tests (α = 0.05). Results. There were no significant differences in enamel and dentin microleakage between the adhesives (P = 0.683; P = 0.154). Furthermore, no significant differences were observed in enamel microleakage of each one of CPB and BB (P = 0.061 and P = 0.318, resp.). However, significant decrease was observed in subgroups 3 and 4 (P = 0.001) for CPB dentinal margins. Conclusion. In this study, limited aging procedures had no influence on marginal integrity of composite resin restorations bonded with self-etch adhesives of CPB and BB. Furthermore, CPB dentinal sealing improved after aging.

Figure 1

(a) Enamel and dentin margins of a specimen belonging to group CPB1: CPB after 24 h (×16). (b) Enamel and dentin margins of a specimen belonging to group CPB2: CPB after 3000 thermal cycles (×16). (c) Enamel and dentin margins of a specimen belonging to group CPB3: CPB after 6 months of water storage (×16). (d) Enamel and dentin margins of a specimen belonging to group CPB4: CPB after 3000 thermal cycles plus 6 months of water storage (×16).

Figure 2

(a) Enamel and dentin margins of a specimen belonging to group BB1: BB after 24 h (×16). (b) Enamel and Dentin margins of a specimen belonging to group BB2: BB after 3000 thermal cycles (×16). (c) Enamel and dentin margins of a specimen belonging to group BB3: BB after 6 months of water storage (×16). (d) Enamel and dentin margins of a specimen belonging to group BB4: BB after 3000 thermal cycles plus 6 months of water storage (×16).