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AIM – The aim of this study was to evaluate marginal sealing ability of newly introduced Dyad Flow with total etch & self-etch adhesive system at the coronal and apical margins of class V resin composite restorations.
Methods- A standard class V cavity (3 mm mesiodistal width, 3 mm occlusogingival height, and 1.5 mm axial depth) was prepared on the buccal surface of freshly extracted sound human teeth. The occlusal and the gingival margins of the cavities were located on the enamel and cementum/dentin, respectively. Teeth were randomly assigned into three groups (n = 10) and restored with different composite materials following the manufacturer’s instructions: groups I was restored with nanohybrid resin composite using Self etch bonding agent ; group II: was restored with nanohybrid resin composite using Total etch technique; group III: flowable composite (Dyad Flow), respectively. After finishing and polishing, the teeth were stored in distilled water at 37°C, coated with nail varnish, and immersed in a rhodamine B dye, and then longitudinally sectioned. Dye penetration was examined with a stereomicroscope and scored separately for occlusal and gingival on a 0-3 ordinal scale. Data were analyzed with Kruskal-Wallis, Mann-Whitney and Wilcoxon tests (a=0.05).
Results – Coronal and apical margins were scored separately using a 0-3 ordinal ranking system and the recorded values were statistically analyzed using Kruskal-Wallis, Mann- Whitney U-test and Wilcoxon signed rank test. Statistical analysis showed that there was less microleakage in Total-etch and Self-etch Bonding agents at coronal region, overall Totaletch showed less marginal permeability in both coronal and apical regions. Comparison of three groups showed that microleakage, although seen in all samples, but seen significantly more in cervical regions restored with Dyad Flow.
Conclusion- Specimens restored with the Total-etch and Self-etch adhesive systems revealed reduced leakage at the coronal margin. At the apical margin, DyadFlow showed greater leakage than the other group.