| Summary: | The aim of this study was to investigate the influences of an intermediate layer of flowable composite resin and resin modified glass ionomer cement and hollow ground bevel preparation on the microleakage of class II composite resin restoration.
Twenty human extracted premolar teeth were randomly divided into 4 groups, group I, class II composite resin restoration with gingival hollow ground bevel (at coronal CEJ) and intermediate layer (IA flowable composite resin, IB resin modified glass ionomer cement), group II class II composite resin restoration using intermediate layer (IIA flowable composite resin, IIB resin modified glass ionomer cement) without gingival bevel. Specimens were stored in artificial saliva for 24 hours at 37�C, thermocycled (4� - 60� x25) and then immersed in 2% methylene blue dye for 24 hours and centrifuged for 5 minutes 3000rpm. Dye penetration was assessed using stereo microscope 250 magnification according to a 4-point scale. Data was analyzed using Kruskal-Wallis and Mann-Whitney U tests at �0,05 significance level and 95% confidence level.
There was an influence on microleakage between group IA, IB, IIA, and IIB. The results of the study showed that the microleakage means of group IA was (0,7±0,28), group IB (1,3±0,48), group IIA (0,9±0,32), group IIB (2,1±0,99).
It was concluded that there was an influence of intermediate layer using flowable composite resin and resin modified glass ionomer cement, and hollow ground bevel preparation on microleakage of class II composite resin restoration.
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