Does extended air-drying time improve bond strength of universal adhesives to enamel?


JOURNAL OF ESTHETIC AND RESTORATIVE DENTISTRY, vol.35, no.7, pp.1113-1120, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 35 Issue: 7
  • Publication Date: 2023
  • Doi Number: 10.1111/jerd.13050
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, CINAHL, EMBASE, MEDLINE
  • Page Numbers: pp.1113-1120
  • Keywords: air-drying time, bond strength, enamel, solvent evaporation, universal adhesives
  • Recep Tayyip Erdoğan University Affiliated: Yes


ObjectiveTo investigate the effect of extended air-drying time on the microshear bond strength (MSBS) of universal adhesives to enamel.Materials and MethodsThe distal and mesial specimens from third molars were wet-ground and randomly assigned to three groups according to adhesives tested (n = 60): Clearfil Bond Universal, Gluma Bond Universal, and G-Premio Bond. The adhesives were applied in etch-and-rinse or self-etch modes, followed by air-drying for 5, 15, or 25 s. Composite buildups were constructed and subjected to the MSBS test after 24-h or thermocycling. MSBS results were evaluated using a four-way ANOVA. The thickness of the adhesive layer and the degree of solvent evaporation were further evaluated.ResultsAt 24-h, MSBS of G-Premio Bond significantly improved with the 25 s air-drying in both of the etching modes when compared to the 5 s air-drying. After thermocycling, the extended air-drying did not produce a significant difference on the MSBS, regardless of the application strategy. Extended air-drying (25 s) evaporated almost all of the volatile part of Gluma Bond Universal and G-Premio Bond.ConclusionsExtended air-drying times increased solvent evaporation but did not contribute to the bonding effectiveness of the adhesives, regardless of the etching mode.Clinical SignificanceAir-drying applications for more than 5 s had no significant effect on enamel bonding performance of universal adhesives.