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

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: 3.2). 06/2008; 36(5):309-15. DOI: 10.1016/j.jdent.2008.01.018
Source: PubMed

ABSTRACT 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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    ABSTRACT: Objectives To evaluatethe effect of an additional hydrophobic resin coating (HE) on theresin-dentin microtensile bond strengths (μTBS), nanoleakage (NL), and in situ degree of conversion (DC) of three universal adhesives used in the etch-and-rinse [ER] and the self-etch [SE] modes. Methods: Sixty caries-free extracted third molars were divided into 12 groups according to the combination of the factorsadhesive (All-Bond Universal [ABU]; G-Bond Plus [GBP] and Scotchbond Universal [SBU]),adhesive strategy (ER and SE), and the use ofHE (Heliobond; yes or no). After restorations were constructed, specimens were stored in water (37 °C/24 h) and sectioned into resin-dentin beams (0.8 mm2)to be tested under tension (0.5 mm/min). Selected beams from each tooth were used for DC quantificationand for NL evaluation. Data from each adhesivewere analyzed with two-way ANOVA and Tukey's test (α=0.05). Results:ABU and GBPresulted in higher μTBS in the ER mode. The use of HE increased the μTBS of ABU and GBP only in the SE mode. Lower NL was observed for SBU and ABU in the ER mode + HE, and for GBP in the SE mode + HE. SBU and GBP showed higher DC when used in the ER mode, which was increased with HE application. The DC of ABU was similar in all conditions. Conclusions:the conversionof 1-step SE to 2-step SE may increase the μTBS and DC of current universal adhesives. The reduction in the NL is more dependent on the adhesive composition than on the bonding strategy.
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