| Summary: | The aim of this study was to compare the efficacy of Methacrylate-based
and Silorane-based resin composite on the microleakage of class II direct
restorations which were measured at the gingival cavosurface margins located on
enamel and dentin.
A total of 20 extracted human maxillary premolars were randomly divided
into 4 groups of 10. After all groups were treated with class II cavity preparation,
subsequently group A was filled with methachrylate resin composite (A1 for class
II with gingival margin located on enamel and A2 located on dentin). Group B
was filled with Silorane resin composite (B1 for Class II with gingival margin
located on enamel and B2 located on dentin). Specimens were stored in artificial
saliva for 24 hours at 37ºC, thermocycled (4º - 60º x 25) and then immersed in 2%
methylene blue dye for 24 hours and centrifuge for 5 minutes 3000 rpm. 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.
The results of the study showed that the microleakage means of group A1
was 1,3±0,675, group A2 1,60±1,430, group B1 0,80±0,632, group B2
0,40±0,516. There was a difference on microleakage between group A1, A2 and
B1, B2. There was no difference on microleakage between group A1, B1 and A2,
B2.
It was concluded that there was a difference between methachrylate and
silorane-based resin composite where silorane showed least microleakage. There
was no difference on microleakage when gingival margin of class II direct
restorations located at enamel or dentin.
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