Abstract: Objective: To evaluate shear bond strength and marginal microleakage of Class Ⅴ cavities restored by resin modified glass ionomer cement combined with self-etching adhesive. Methods: Forty fresh extracted molars were collected and divided into four groups randomly: A1, A2, B1, and B2. The group A were prepared dentinal plane on buccal surface, the group A1 was not treated and the group A2 was handled with ibond. Resin modified glass ionomer cement cylinder was bonded to the dentinal plane by mold and Curing-Lingt. The shear bond strength was detected by electronic universal force measurement machine. The group B were prepared Class Ⅴ cavities, the group B1 was not treated and the cavity of group B2 was handled with ibond. After FujiⅡLC filling, the routine modification and polishing were performed. The specimens were cut into thin sections after they were incubated at 37℃ 1g/L rhodamine B solution for 24 hours and fluorescence staining. The depth of dye penetration was measured by confocal microscope. Results: The shear bond strengths of dentin in A1 and A2 were (5.15±0.69) and (14.91±1.33) MPa. The depths of marginal microleakage in group B1 and B2 were (21.64±1.10) were (8.63±0.56) μm. Significant differences were observed in group A and group B (P<0.05). Conclusion: The using of self-etching adhesive could improve the bonding strength of dentin and reduce the marginal microleakage when filling the Class Ⅴ cavities with resin modified glass ionomer cement.

Key words: Resin modified glass ionomer cement, Self-etching adhesive, Shear bond strength, Marginal microleakage, Class, Ⅴ cavity