the effect of 6-month water storage on microleakage of two-component self-etch adhesive systems

the effect of 6-month water storage on microleakage of two-component self-etch adhesive systems      dr. mohammadibasir m .,1 dr. seyed tabaii e .2   1 assistant professor, department of operative dentistry , school of dentistry, shahed university. tehran , iran.   2 dentist.     (received 5 dec, 2010 accepted 14 april, 2011)     abstract     background and aim : simplification of the self-etching process may affect durability therefore, long-term durability of these systems in oral conditions has been attended. the aim of this study was to evaluate the effect of 6-month water storage on microleakage of two-component self-etch adhesive systems and to compare these systems with etch and rinse adhesive systems in class v cavities.   materials and methods : in this in-vitro study, class v cavities were prepared at buccal and lingual surfaces of ninety-six human molars and the enamel margin was beveled (0.5 mm width). the teeth were randomly assigned into four groups (n=24). twelve teeth were assessed after one day and 12 after 6 months. the adhesive groups were scotch bond multi-purpose, single bond, clearfil se bond and all-bond se.   after thermocycling, immersion in dye solution and sectioning, the samples were examined using a stereomicroscope. the data were analyzed by kruskal-wallis, dunn, mann-whitney u and wilcoxon tests (p<0.05).   results : in the one day samples, a-b se adhesive system showed higher microleakage at the occlusal margin (p<0.05). however, there was no significant difference between four adhesive systems at the gingival margin. in the 6-month samples there was no significant difference between four adhesive systems at the occlusal margin, while at the gingival margin etch and rinse adhesive systems (smp and sb) presented significantly higher microleakage (p<0.05).   conclusion : pass of time did not affect microleakage of the self-etch adhesive systems at the gingival margin.   key words : microleakage – two component – self etch – adhesive systems – water storage     corresponding author: dr. seyed tabaii e ., dentist.   e.mail: [email protected]