In vitro evaluation of marginal leakage on class II composite restorations
Keywords:Microleakage, Composites, Adhesive systems
AbstractThe purpose of this study was to in vitro evaluate the marginal leakage of class II composite restorations. It was utilized 30 human molar teeth with oclusal-proximal cavities, with enamel margins at the mesial and dentin at the distal sites. These teeth were divided into 3 groups (G), according to the restoration system utilized: G1 – Single Bond / Z100 (3M); G2 – Bond 1 / ALERT (Jeneric-Pentron); and G3 – Etch&Prime 3.0 / Degufill Mineral (Degussa). Epoxy resin replicas of the restored teeth were fabricated before and after thermocycling procedure. After the restoration procedure, the samples were thermocycled 500 times, covered with 2 layers of nail polish and immersed in a 2% buffered solution of methylene blue for 4 hours. After they were cut and analyzed in a microscope, where the dye penetration was measured and converted to percentage. Data were submitted to ANOVA and mean values compared by Tukey’s test. Conclusion: there were no difference between groups with restorations in enamel margins (G1=21.59%. G2=53.49%, G3= 31.58%), however in dentin margins, there was significant statistical difference (p<0.05) between G1 (18.23%) and G2 (60.08%); where G1 showed lower mean values of dye penetration. G3 (42.24%) had intermediary mean values and did not differ from the others (p>0.05). In the replicas observation it appeared that the gaps dimensions increased.
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