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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    ABSTRACT: This study aimed to evaluate the microtensile bond strength and amount of microleakage with self-etch adhesives. For the bond strength study, 50 human third molars were randomly assigned to five groups according to the adhesive system used. In each group, half of the specimens were subjected to the microtensile test immediately after the bonding procedures and tooth sectioning, while the remaining half were subjected to the test after storage in distilled water for 3 months. For the microleakage study, following the preparation and restoration of class V cavities, 70 human molars were divided into two groups for the five adhesives; the specimens in one group were stored in distilled water for 24 h and those in the other group were stored for 3 months. In both groups, the teeth were sectioned and evaluated for dye penetration after the storage time. After 24 h, the microtensile bond strengths in descending order were as follows: Clearfil SE Bond > G Aenial Bond > Optibond All-in-One (AiO) > Adper Prompt L Pop (hereafter L Pop) > Futurabond M. After 3 months, the µTBS of all five bonding agents was decreased, although the decrease was significant only for L Pop, which showed the highest scores for leakage around the enamel margins, whereas Futurabond M showed the highest scores for leakage around the gingival margins. After 3 months, the microleakages scores significantly increased for G Aenial Bond, Futurabond M and OptibondAiO.
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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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    ABSTRACT: Objectives: To evaluate the effect of application time on the resin-dentin bond strength (µTBS) and etching pattern of adhesive systems applied on sclerotic dentine. Material and Methods: A total of forty-two bovine incisors had their roots removed. The 1-step self-etch GO (SDI), the 2-step self-etch Adper SE Bond (3MESPE) and the 35% phosphoric acid (3MESPE) from the 2-step etch-and-rinse Adper Single Bond 2 (3MESPE) were applied on the bovine incisal surfaces according to the manufacturer's instructions or duplicating the recommended conditioning time. After adhesive application, thirty teeth were restored with composite resin, stored for 24 h in distilled water at 37º C, and sectioned into resin-dentin bonded sticks (0.8 mm2) and tested according to the µTBS at 0.5 mm/min. The etching pattern of the remaining twelve teeth (n=4 for each material) was examined under scanning electron microscopy. Each tooth was divided into a buccal-to-lingual direction into three thirds, and each third randomly assigned to the groups: control (no treatment), according to the manufacturers' instructions and duplicating the recommended application time. The µTBS and the relative percentage of the tubule area opening were evaluated by two-way repeated measures ANOVA and Tukey's tests (α=0.05). Results: The duplication of the conditioning time favored only the GO adhesive (p<0.05). Both application methods significantly increased the tubule area opening (p<0.05) compared to the controls. Conclusions: The efficacy of duplicating the conditioning time was only effective for the 1-step self-etch adhesive system tested.
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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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    ABSTRACT: To evaluate and compare the microleakage of self-etch adhesives placed under different clinical techniques and to analyze the resin-dentin interfacial ultrastructure under scanning electron microscope (SEM). 100 extracted human premolars were divided into two groups for different adhesives (Clearfil S(3) and Xeno III). Class V cavities were prepared. Each group was further divided into four subgroups (n = 10) according to the placement technique of the adhesive, i.e. according to manufacturer's directions (Group 1), with phosphoric acid etching of enamel margins (Group 2), with hydrophobic resin coat application (Group 3), with techniques of both groups 2 and 3 (Group 4). The cavities were restored with composite. Ten samples from each group were subjected to microleakage study. Five samples each of both the adhesives from groups 1 and 3 were used for SEM examination of the micromorphology of the resin-dentin interface. At enamel margins for both the adhesives tested, groups 2 and 4 showed significantly lesser leakage than groups 1 and 3. At dentin margins, groups 3 and 4 depicted significantly reduced leakage than groups 1 and 2 for Xeno III. SEM observation of the resin-dentin interfaces revealed generalized gap and poor resin tag formation in both the adhesives. Xeno III showed better interfacial adaptation when additional hydrophobic resin coat was applied. In enamel, prior phosphoric acid etching reduces microleakage of self-etch adhesives, while in dentin, hydrophobic resin coating over one-step self-etch adhesives decreases the microleakage.
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