Comparison of Microleakage of One - Step and Two - Step Self Etching Adhesive Resins in Class V Composite Restorations

The use of adhesive resins is one of the methods that improves marginal adaptation and reduces microleakage in composite restorations. The aim of this study was to compare the microleakage of class V composite restorations bonded with one – step and two – step self etching adhesive resins in vitro. Methods and Materials: In buccal surfaces of 30 extracted human sound premolars class V cavities were prepared. The teeth were randomly divided into two groups. In group 1 two-step self etching adhesive resin and in group 2 one-step self etching adhesive resin were used and the teeth were restored with composite. Following thermocycling, immersing in dye and sectioning, microleakage of the samples was evaluated under stereomicroscope. Wilcoxon test was used to compare the microleakage of occlusal and gingival margins in each group and in order to compare the microleakage of occlusal and gingival margins between two adhesive resins Mann-Whitney U test was used. There were statistically significant differences in microleakage scores between occlusal and gingival margins in two groups (P < 0.05). No statistically significant difference was observed in comparing microleakage scores of two adhesive resins in occlusal and gingival margins (P > 0.05). In both groups, the microleakage in gingival margins was significantly more than occlusal margins and the microleakage of gingival and occlusal margins was not statistically different in two adhesive systems.