Abstract
Objectives
This study aimed to evaluate the ultramorphological characteristics of tooth–resin interfaces and the bond strength (BS) of multimode adhesive systems to enamel and dentin.
Methods
Multimode adhesives (Scotchbond Universal (SBU) and All-Bond Universal) were tested in both self-etch and etch-and-rinse modes and compared to control groups (Optibond FL and Clearfil SE Bond (CSB)). Adhesives were applied to human molars and composite blocks were incrementally built up. Teeth were sectioned to obtain specimens for microtensile BS and TEM analysis. Specimens were tested after storage for either 24 h or 1 year. SEM analyses were performed to classify the failure pattern of beam specimens after BS testing.
Results
Etching increased the enamel BS of multimode adhesives; however, BS decreased after storage for 1 year. No significant differences in dentin BS were noted between multimode and control in either evaluation period. Storage for 1 year only reduced the dentin BS for SBU in self-etch mode. TEM analysis identified hybridization and interaction zones in dentin and enamel for all adhesives. Silver impregnation was detected on dentin–resin interfaces after storage of specimens for 1 year only with the SBU and CSB.
Conclusions
Storage for 1 year reduced enamel BS when adhesives are applied on etched surface; however, BS of multimode adhesives did not differ from those of the control group. In dentin, no significant difference was noted between the multimode and control group adhesives, regardless of etching mode.
Clinical relevance
In general, multimode adhesives showed similar behavior when compared to traditional adhesive techniques. Multimode adhesives are one-step self-etching adhesives that can also be used after enamel/dentin phosphoric acid etching, but each product may work better in specific conditions.
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Acknowledgments
This study was supported by grants from Capes (#840/2010) and CNPq (#307217-2014-0), Brazil. The authors are indebted to Eliene A. O. N. Romani (FOP-UNICAMP) for technical transmission electron microscopy support and National Center for Research in Energy and Materials (CNPEM, # SEM—16581, Campinas, SP, Brazil) for technical scanning electron microscopy support.
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Paulo Moreira Vermelho declares that he has no conflict of interest. André Figueiredo Reis declares that he has no conflict of interest. Glaucia Maria Bovi Ambrosano declares that he has no conflict of interest. Marcelo Giannini declares that he has no conflict of interest.
Funding
The work was supported by grants from Capes (#840/2010) and CNPq (#307217-2014-0).
Ethical approval
This study used human teeth and the project was approved by local Institutional Ethics Committee (#037/2013).
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For this type of study, formal consent is not required.
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Vermelho, P.M., Reis, A.F., Ambrosano, G.M.B. et al. Adhesion of multimode adhesives to enamel and dentin after one year of water storage. Clin Oral Invest 21, 1707–1715 (2017). https://doi.org/10.1007/s00784-016-1966-1
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DOI: https://doi.org/10.1007/s00784-016-1966-1