The purpose of this study was to evaluate microleakage of six current dentin bonding systems. In this in vitro study, class V cavities were prepared on buccal and lingual surfaces of thirty extracted human molars. Each margin was on enamel and dentin/cementum. Experimental teeth were randomly divided into six groups of 5 each. Group 1 : Scotchbond Multi-Purpose : Group 2 : Single Bond : Group 3 : Prime&Bond NT : Group 4 : Clearfil Liner Bond 2 : Group 5 : MAC-BondⅡ : Group 6 : One-up Bond F. The bonding agent and composite resin were applied to class V cavities according to manufacturers directions. After thermocycling, the specimens were immersed in 0.5% basic fuchsin dye solution for 6 hours and sectioned longitudinally through the center of the restoration with a low speed diamond saw. The degree of microleakage was measured as the extent of dye penetration under the stereomicroscope at x 20. The data were analyzed using one-way ANOVA. When significant differences found, multiple comparisons were made using Duncan ´s Multiple Range Test.
The results of this study were as follows:
1. In all groups, leakage value seen at the enamel margin was significantly lower than that seen at the dentin margin(P<0.001).
2. At the enamel margin, none of the dentin bonding systems used in this study showed statistically significant difference in leakage values(P<0.05).
3. At the cementum margin, group 3 showed the highest leakage value, and others were decreased as group 5. 6. 4 in that order, and group 1, 2 showed the lowest leakage value. There was statistically significant difference between group 3 and the other groups except for group 5(P<0.05).
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