Universal adhesives and dual-cured core buildup composite material: adhesive properties

Pâmela Malaquias, Mario Felipe Gutiérrez, Elisama Sutil, Thalita Paris De Matos, Taise Alessandra Hanzen, Alessandra Reis, Jorge Perdigão, Alessandro Dourado Loguercio*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


OBJECTIVE: Dual-cured buildup composites and simplified light-cured adhesive systems are mixed with a chemical activator to prevent the incompatibility between them. To evaluate microshear bond strength (μSBS) and nanoleakage (NL) of three universal adhesives used under buildup composites using different curing modes, at baseline and after 6-months (6m).

METHODOLOGY: Dentin specimens of 55 molars were assigned to: Clearfil Universal Bond[CFU], Prime&Bond Elect[PBE] and One Coat 7 Universal[OCU]. All-Bond Universal[ABU] and Adper Scotchbond Multi-Purpose[SMP] were used as controls. CFU, PBE, and OCU were: light-cured [LC], dual-cured using a self-curing activator [DC], and self-cured, using a self-curing activator and waiting for 20 min [SC]. Upon the application of the adhesive, transparent matrices were filled with a dual-cured buildup composite and light cured, then tested in mSBS. For NL, the specimens were submersed in ammoniacal silver nitrate and sectioned to observe under the SEM. Three-way ANOVA and Tukey's test were applied (α=0.05).

RESULTS: OCU/LC-PBE/LC resulted in higher mean μSBS than ABU/LC. For SMP/DC higher mean μSBS were obtained than for both CFU/DC and OCU/DC (baseline). No universal adhesive was significantly affected by curing mode or storage time. CFU, PBE, and OCU did not undergo significant changes in any curing mode (p>0.05). NL (baseline) PBE/LC resulted in higher %NL compared to ABU/LC. SMP/DC resulted in higher %NL than CFU/DC-OCU/DC. CFU/LC/DC resulted in lower %NL than CFU/SC. PBE/SC resulted in lower %NL than PBE/DC. OCU/LC/SC showed lower %NL than OCU/DC. OCU showed significant lower %NL than CFU and PBE. All CFU groups, as well as OCU/SC, resulted in increased %NL at 6m when compared with baseline.

CONCLUSION: For universal adhesives used in etch-and-rinse mode, self-cured activator and different curing modes did not influence μSBS. However, some interactions were observed for NL, but this influence was material-specific.

Original languageEnglish
Article numbere20200121
Pages (from-to)e20200121
Number of pages15
JournalJournal of Applied Oral Science
StatePublished - 2020

Bibliographical note

Publisher Copyright:
© 2020, Bauru School of Dentistry, University of Sao Paulo. All rights reserved.


  • Adhesive
  • Dental Leakage
  • Self-Curing of Dental Resins
  • Shear Strength


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