Effect of Adhesive Pretreatments on Marginal Sealing of Aged Nano ionomer Restorations

Background and aims. Nano ionomer (NI) interacts with tooth structures superficially, and there is a concern about the enamel bonding ability of mild self etch Ketac primer. This study compared the effect of different adhesive procedures (self etching and etch and rinse approach) on long term marginal microleakage of nano filled resin modified glass ionomer (NI) cervical restorations. Materials and methods. Class V cavities were prepared on 72 maxillary premolars. The teeth were divided into six groups: G1: No treatment (NC) G2: Ketac primer (K primer) G3: Etchant + Ketac primer (E+K primer) G4: Self etch adhesive (Bond Force) G5: Etchant + Bond Force (E+Bond Force) G6: Etchant + Adper Single Bond (Etch and rinse adhesive). All the cavities were restored with Ketac N100. The sles were stored in water for 6 months and thermocycled for 2000 cycles. Marginal sealing was assessed using dye penetration technique. Data were analyzed with non parametric tests (α=0.05). Results. All the adhesive pretreatments resulted in a lower marginal leakage than that of NC (P≤0.01), except for E+Bond Force at the dentin margin. There was no significant difference between K primer and Bond Force. Microleakage differed significantly between K primer pretreatment and E+K primer (P=0.003), E+Bond Force (P=0.002) and etch and rinse adhesive (P=0.001) at the enamel margin, but it did not differ at the dentin margin. E+ Bond Force group showed insignificantly lower leakage at the enamel margin and significantly higher leakage at the dentin margin (P=0.02). Conclusion. Etch and rinse adhesive and selective enamel etching along with self etch adhesive/Ketac primer might improve marginal sealing of aged nano ionomer restoration.