Method: Thirty six box-type Class V standardized cavities were prepared on the facial and oral surfaces of eighteen teeth, with coronal margins in enamel and apical margins in cementum (dentin). The preparations were divided randomly into three equal groups and restored with Beautifil II (Shofu), in combination with different adhesive systems: group1 FL II Bond(Shofu), group 2 and 3- two new experimental adhesive systems for which the primer contained polyalchenoic acids modified with polymerizable groups as base components.The teeth were thermocycled and immersed in 2% methyl blue solution for 12 hours. The specimens were sectioned buccolingually into 3 slices and the resulted sections were examined using a stereomicroscope under 20x magnification. The extent of dye penetration was scored using the ISO microleakage scoring system.These percentage values were submitted to variance analyses to t test at a p<0.05 level of significance.SEM photomicrographs of the interfacial region between tooth and restorative material were performed for each tooth.
Result: There was a significant difference between the three different adhesive systems in their extent of microleakage at the cervical margin. The A2 adhesive system demonstrated better seal with no leakage.At the enamel margin the A1 adhesive system demonstrates the best microleakage score with three of specimens having no microleakage.For the FL II Bond all restaurations that have microleakage, this is only into halves of the cervical and enamel wall.
Conclusion: Further research should provide enlightening data on the in vitro performance of the giomer resin-based material when used in combination with experimental total etch adhesive systems.