摘要：OBJECTIVE: To evaluate the microleakage of a giomer-based flowable composite resin and an adhesive system, and their combination with a conventional flowable composite resin and an adhesive system in Class V cavities. MATERIALS AND METHOD: Standardized Class V cavities (mesial-distal width: 4 mm, occlusal-gingival width: 3 mm, depth: 2 mm) were prepared on the buccal and lingual sides of 20 human third molars. The teeth were randomly divided into 4 groups containing 10 cavities each. Giomer adhesive system FL-Bond II and flowable composite Beautifil Flow Plus and conventional adhesive system Clearfil SE Bond and flowable composite Filtek Ultimate were used as follows; Group FLB: FL-Bond II+Beautifil Flow Plus, Group FLU: FL-Bond II+Filtek Ultimate, Group SEB: Clearfil SE Bond+Beautifil Flow Plus, Group SEU: Clearfil SE Bond+Filtek Ultimate. The teeth were subjected to 1000 thermal cycles between 5-55 o C and then immersed in 0.5% basic fuchsin solution for 24 h. The dye penetration was examined under a stereomisroscope and scored. The results were statistically analyzed by using Kruskal-Wallis and Mann-Whitney U tests. RESULTS: Significant differences were detected both in enamel and in dentin (p<0.05). In dentin, Group FLB exhibited significantly higher microleakage scores than the other groups (p<0.05). In enamel, Group SEU exhibited significantly higher microleakage scores than Group FLB and Group SEB (p<0.05). CONCLUSION: In dentin, combination of both type of flowable composites with the 10-MDP-containing conventional adhesive system (Clearfil SE Bond) caused less microleakage. In enamel, regardless of the type of the adhesive system groups restored with the giomer composite exhibited less microleakage.
