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

Abstract

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 samples 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.

Oral Function Improves Interfacial Integrity and Sealing Ability Between Conventional Glass Ionomer Cements and Dentin

“…The movement of the fluorescent dye into the cement material indicates the micropermeability of the dentin interface and it also confirms the presence of a highly stained unsealed area adjacent to the dentin interface (Sidhu & Watson, 1998). This might lead to the instability of the interface in the long term (Shafiei et al, 2015). Samples were labeled simultaneously, by combining specific filters.…”

“…The strong and superficial mechanical interlocking might be responsible for this finding, which possibly can be a consequence of the lack of a previous conditioning step (Coutinho et al, 2009). Shafiei et al (2015) have stated that one of the disadvantages of RMGICs is their degradability which may deteriorate faster than conventional GICs. Nevertheless in this study, RMGIC interfaces were also characterized by a strong reflective signal, in white (Fig.…”

Effect of Incorporation of Hydroxyapatite Nanorods in Self-Etch Adhesive on Microtensile Bond Strength and Micromorphological Patterns of Resin/Dentin Interface

“…The dwell period was 15s, with a 5s transfer time from one bath to another. 9 Continuous checking for water temperature had occurred to achieve a reliable thermocycling effect. 10 The bonded specimen was receiving a series of cutting perpendicular to the longitudinal axis in X and Y directions using a low-speed automated saw made of diamond (IsoMetTM 4000, USA) underwater coolant to produce dentin-resin composite beams with a surface area of (1mm x 1mm).…”