Hydrophilicity of dentin bonding systems influences in vitro Streptococcus mutans biofilm formation

Eugenio Brambilla, Andrei Ionescu, Annalisa Mazzoni, Milena Cadenaro, Massimo Gagliani, Monica Ferraroni, Franklin Tay, David Pashley, Lorenzo Breschi

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Objective To evaluate in vitro Streptococcus mutans (S. mutans) biofilm formation on the surface of five light-curing experimental dental bonding systems (DBS) with increasing hydrophilicity. The null hypothesis tested was that resin chemical composition and hydrophilicity does not affect S. mutans biofilm formation. Methods Five light-curing versions of experimental resin blends with increasing hydrophilicity were investigated (R1, R 2, R3, R4 and R5). R1 and R2 contained ethoxylated BisGMA/TEGDMA or BisGMA/TEGDMA, respectively, and were very hydrophobic, were representative of pit-and-fissure bonding agents. R3 was representative of a typical two-step etch-and-rinse adhesive, while R4 and R5 were very hydrophilic resins analogous to self-etching adhesives. Twenty-eight disks were prepared for each resin blend. After a 24 h-incubation at 37°C, a multilayer monospecific biofilm of S. mutans was obtained on the surface of each disk. The adherent biomass was determined using the MTT assay and evaluated morphologically with confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM). Results R2 and R3 surfaces showed the highest biofilm formation while R1 and R4 showed a similar intermediate biofilm formation. R5 was more hydrophilic and acidic and was significantly less colonized than all the other resins. A significant quadratic relationship between biofilm formation and hydrophilicity of the resin blends was found. CLSM and SEM evaluation confirmed MTT assay results.

Original languageEnglish (US)
Pages (from-to)926-935
Number of pages10
JournalDental Materials
Issue number8
StatePublished - Aug 2014


  • Biofilms
  • Dentin bonding systems
  • Hydrophilicity
  • Streptococcus mutans

ASJC Scopus subject areas

  • Materials Science(all)
  • Dentistry(all)
  • Mechanics of Materials


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