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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/38990

Title: Self-etching Zinc-doped adhesives improve the potential of caries-affected dentin to be functionally remineralized
Authors: Toledano Pérez, Manuel
Aguilera, Fátima
Osorio Ruiz, Estrella
Cabello Malagón, Inmaculada
Toledano-Osorio, Manuel
Osorio Ruiz, Raquel
Issue Date: 2015
Abstract: The aim of this study was to evaluate if mechanical cycling influences bioactivity at the resin-carious dentin interface after bonding with Zn-doped self-etching adhesives. Caries-affected dentin (CAD) surfaces were bonded with: Clearfil SE Bond (SEB), and 10 wt% ZnO nanoparticles or 2 wt% ZnCl2 were added into the SEB primer or bonding components. Bonded interfaces were stored during 24 h, and then tested or submitted to mechanical loading. Microtensile bond strength (MTBS) was assessed. Debonded dentin surfaces were studied by field emission scanning electron microscopy (FESEM). Remineralization of the bonded interfaces was evaluated through nanohardness (Hi) and Young’s modulus (Ei), Raman spectroscopy/cluster analysis, and Masson's trichrome staining technique. Load cycling increased the percentage of adhesive failures. New precipitation of minerals composed of zinc-base salts and multiple Zn-rich phosphate deposits were observed in samples infiltrated with the Zn-doped adhesives. At the hybrid layer, specimens treated with ZnO incorporated in the primer (SEB·P-ZnO), after load cycling, attained the highest Ei and Hi. Load cycling increased Ei at the bottom of the hybrid layer when both, SEB un-doped and SEB with ZnCl2 included in the bonding (SEB·Bd-ZnCl2), were used. ZnO incorporated in the primer promoted an increase in height of the phosphate and carbonate peaks, crystallinity, relative mineral concentration, and lower collagen crosslinking. ZnCl2 included in the bonding attained similar results, but relative mineral concentration decreased, associated to higher crosslinking and restricted collagen maturation. Staining techniques permitted to observe no signs of exposed protein at the resin-dentin interface after using SEB·PZnO.
Sponsorship: This work was supported by grant MINECO/FEDERMAT2014-52036-P.
Publisher: American Vacuum Society
Keywords: Self-etching adhesives
Load cycling
Interface structure
Chemical bonds
Mechanical properties
URI: http://hdl.handle.net/10481/38990
ISSN: 1934-8630
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Toledano Pérez, M.; et al. Self-etching Zinc-doped adhesives improve the potential of caries-affected dentin to be functionally remineralized. Biointerphases, 10(3): 031002 (2015). [http://hdl.handle.net/10481/38990]
Appears in Collections:CTS242 - Artículos

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