Abstract
Objectives
The purpose of this study is to evaluate the hypothesis that replacing 2-hydroxyethyl methacrylate (HEMA) for surfactant dimethacrylates (SD) does not affect the immediate and long-term microtensile bond strength (μTBS) of experimental two-step self-etch HEMA-free adhesive systems applied on dentin.
Materials and methods
Five experimental HEMA-free two-step self-etching systems containing different SD (ethoxylated bisphenol A diglycidyl dimethacrylate (Bis-EMA 10, B10), Bis-EMA 30 (B30), poly-ethyleneglycol (400) dimethacrylate (PEG 400, P400), PEG 1000 (P1000), and PEG 400 urethane dimethacrylate (UDMA) (UP400)) and a HEMA-containing system (control) (HA) were formulated. Specimens were subjected to the μTBS test after 24 h and 6 and 12 months of storage. Data (in megapascals) were analyzed by Kruskal–Wallis and Dunn tests (α = 0.05).
Results
Medians of the μTBS data after 24 h of storage are: HA = 57.2A, B10 = 26.2BC, B30 = 24.0C, P400 = 32.6BC, P1000 = 37.3B, and UP400 = 57.9A; after 6 months are: HA = 47.9A, B10 = 18.5B, B30 = 7.8C, P400 = 16.1B, P1000 = 14.6BC, and UP400 = 51.6A; and after 12 months are: HA = 31.2A, B10 = 15.2B, B30 = 9.0B, P400 = 9.1B, P1000 = 13.3B, and UP400 = 35.7A. Between the HEMA-free groups, the adhesive system formulated with PEG 400 UDMA produced similar μTBS to the HEMA-containing group. Also, the storage of specimens decreased the μTBS (p < 0.05).
Conclusion
Replacing HEMA for PEG 400 UDMA in an adhesive system formulation generated a satisfactory μTBS to dentin.
Clinical relevance
Surfactant dimethacrylates have a potential use in the development of HEMA-free self-etching adhesive systems, which are more chemically stable.
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Acknowledgments
The authors would like to thank the Brazilian National Council for Scientific and Technological Development (CNPq) for financial support, CAPES/MEC (Brazilian Government) for scholarship (Process-1145-09-6), and Esstech Inc. for reagent donation.
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The authors declare that they have no conflict of interest.
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Zanchi, C.H., Münchow, E.A., Ogliari, F.A. et al. Effects of long-term water storage on the microtensile bond strength of five experimental self-etching adhesives based on surfactants rather than HEMA. Clin Oral Invest 17, 833–839 (2013). https://doi.org/10.1007/s00784-012-0791-4
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DOI: https://doi.org/10.1007/s00784-012-0791-4