Can the durability of one-step self-etch adhesives be improved by double application or by an extra layer of hydrophobic resin? J Dent

Department of Restorative Dentistry, Universidade Estadual de Ponta Grossa, Avenida General Carlos Cavalcanti, 4748, Bloco M, Sala 64A, Uvaranas, Ponta Grossa, PR 84030-900, Brazil.
Journal of Dentistry (Impact Factor: 2.75). 06/2008; 36(5):309-15. DOI: 10.1016/j.jdent.2008.01.018
Source: PubMed


This study evaluated the immediate and 6-month resin-dentin micro-bond strength (microTBS) of one-step self-etch systems (Adper Prompt L-Pop [AD] 3M ESPE; Xeno III [XE] Dentsply De Trey; iBond [iB] Heraeus Kulzer) under different application modes.
Dentin oclusal surfaces were exposed by grinding with 600-grit SiC paper. The adhesives were applied according to the manufacturer's directions [MD], or with double application of the adhesive layer [DA] or following the manufacturer's directions plus a hydrophobic resin layer coating [HL]. After applying the adhesive resins, composite crowns were built up incrementally. After 24-h water storage, the specimens were serially sectioned in "x" and "y" directions to obtain bonded sticks of about 0.8mm2 to be tested immediately [IM] or after 6 months of water storage [6M] at a crosshead speed of 0.5mm/min. The data from each adhesive was analyzed by a two-way repeated measures ANOVA (mode of application vs. storage time) and Tukey's test (alpha=0.05).
The adhesives performed differently according to the application mode. The DA and HL either improved the immediate performance of the adhesive or did not differ from the MD. The resin-dentin bond strength values observed after 6 months were higher when a hydrophobic resin coat was used than compared to those values observed under the manufacturer's directions.
The double application of one-step self-etch system can be safety performed however the application of an additional hydrophobic resin layer can improve the immediate resin-dentin bonds and reduce the degradation of resin bonds over time.

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    • "Three month water storage significantly decreased mTBS values for L Pop. Reis et al. [29] reported a significant decrease in the bond strength of L Pop after 6 months of water storage (24.3 § 3.1 MPa to 16.9 § 4.1 MPa). Previous studies have shown that aggressive onestep self-etching adhesives (L Pop, Futurabond M) can completely dissolve the smear layer and form relatively thick hybridized complexes that incorporate the dissolved smear layer components.[30] "
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    • "A recent study demonstrated that, among several SE adhesives tested, GO produced the lowest ultimate tensile strength and the lowest µTBS values11. Earlier studies reported that the ultimate tensile strength of the adhesive systems is positively correlated with the µTBS values11,23. Therefore, any effort to improve the strength of the adhesive itself may lead to improvements in the resin-dentin µTBS of the adhesives. "
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    • "However, the effect was significant only for Xeno III [Table 4]. Our results are supported by various studies[9203334] which reported improvement in resin–dentin bonding of one-step self-etch adhesives after hydrophobic resin layer application. At the enamel margins, a slight increase in leakage was observed after hydrophobic resin layer application though the effect was not statistically significant. "
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