Effect of pre-etching on sealing ability of two current of corrent self-etching adhesives

ABSTRACT

We evaluated the effect of phosphoric acid etching on microleakage of two current self-etching adhesives on enamel margins in comparison to a conventional total- etch system. Sixty buccal class V cavities were made at the cemento-enamel junction with beveled enamel margins of extracted human premolar teeth and randomly divided into five groups [12 specimens in each group]. Group 1 was applying with Clearfil SE bond, Group 2 with 35% phosphoric acid etching of enamel margins plus Clearfil SE bond, Group3 with I bond, Group 4 with 35% phosphoric acid etching of enamel margins plus I bond and Group 5 with Scotchbond multi-purpose. All groups restored with a composite resins. After 24 hours storage with 100% humidity, the samples were thermocycled, immersed in a dye solution and sectioned buccoligually and enamel margins microleakage were evaluated on a scale of 0 to 2. The differences between Groups 1 and 3 and Groups 3 and 4 were significant [P<0.05] but no significant differences between Groups1 and 2 or 1 and 5 were observed. The findings suggest that all-in-one adhesive systems need pre-etching enamel margins with phosphoric acid for effectively seal