Abstract: Objective: To compare the effects of three kinds of self-etching adhesives and three kinds of resins on the microleakage of Class V restorations. Methods: Box-shaped class V cavities (3mm×2mm×2mm) were prepared at the neck of buccal and lingual surfaces of 45 freshly extracted third molars. The teeth were divided into 9 groups randomly. There were 5 teeth in each group with 10 cavities. The cavities in each group were restored by different combinations of adhesives and resins. After restored in the constant temperature water of 37℃ for 24 hours, the specimens were soaked in 1% methylene blue solution at room temperature for 24 hours. The specimens were cut buccolingually into two halves with carborundum disc, and the microleakage degree was observed under the stereomicroscope. Results: When matched with S3 bond adhesive, the microleakage of the specimens with different resins was significantly different (P<0.05). When matched with Easy one adhesive and Xeno V adhesive, there was no significant difference in the groups restored by different resins. When restored by Z350 resin and Clearfil AP-X Composite resins, the microleakage was significantly different with different adhesives (P<0.05). When TPH resin was matched with different adhesives, there was no significant difference. Conclusion: The occurrence of microleakage was the result of the interaction between the adhesive and the resin. When Class V cavities were restored clinically, the compatibility of the adhesives and composite resins should be taken into consideration.

Key words: icroleakage, Adhesives, Composite, resin