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ABS TRACT Objective: The aims of this study was to evaluate the bond strength of the self-adhesive composites (SAC; Vertise Flow, Fusio Liquid Dentin, Constic) on caries-affected dentin, which was prepared using an Er:YAG laser, and microleakage of sound dentin by employing Er:YAG laser etching. Material and Methods: Two hundred twenty carious molar teeth were divided into two groups, i.e., laser and bur, respectively, according to different caries removal methods. SAC were applied with three adhesive techniques (i.e., no adhesive, selfetch, total etch, respectively). Shear bond strength tests were performed, and data were then analyzed by using one-way and two-way ANOVA and Tukey HSD tests (p<0.05). Class V cavities were prepared on the buccal and lingual surfaces of one hundred and ten non-carious molar teeth for microleakage evaluation. Laser etching was applied only on buccal cavities. The teeth were divided into subgroups for the evaluation of the bond strength of composite systems. The dye penetration method was employed to evaluate microleakage. Data were analyzed with the Friedman, Wilcoxon Signed Ranks, and Mann–Whitney U tests (p<0.05). Results: Significant differences between the caries removal methods and the shear bond strength of the composites were observed (p<0.05). The bond strength of the SAC group was less than that of the control group. The microleakage evaluation revealed statistically significant differences between the composites (p<0.05). A better sealing performance was observed for the control group. Conclusion: SAC did not provide good bonding and sealing performance without adhesive systems. Further clinical and laboratory studies are required to estimate the bond strength and microleakage values of SAC.

Comparison of the Different Self-Adhesive Composite's Shear Bond Strength and Microleakage on Caries- Affected Dentin with Using Er:YAG Laser