Antibacterial activity of dental composites containing quaternary ammonium polyethylenimine nanoparticles against Streptococcus mutans

Nurit Beyth, Ira Yudovin-Farber, Ran Bahir, Abraham J. Domb, Ervin I. Weiss

Research output: Contribution to journalArticlepeer-review

400 Scopus citations

Abstract

The antibacterial activity of quaternary ammonium polyethylenimine (PEI) nanoparticles embedded at 1% w/w with clinically used bonding, flowable and hybrid dental composite resins and cured by light polymerization was studied. The antibacterial activity was tested with Streptoccocus mutans by: (i) the agar diffusion test (ADT); (ii) the direct contact test; (iii) bacterial growth in the materials elute; (iv) and scanning electron microscope (SEM). Using the direct contact test, antibacterial activity (p<0.001) was found in all three types of composite resins incorporated with the synthesized nanoparticles. The effect lasted for at least 1 month. SEM demonstrated bacterial debris and no streptococcal chains at 24 h of bacterial contact. The addition of 1% w/w of nanoparticles did not affect the flexural modulus and the flexural strength of the dental composite materials.The results indicate that quaternary ammonium PEI nanoparticles immobilized in resin-based materials have a strong antibacterial activity upon contact without leach-out of the nanoparticles and without compromise in mechanical properties.

Original languageEnglish
Pages (from-to)3995-4002
Number of pages8
JournalBiomaterials
Volume27
Issue number21
DOIs
StatePublished - Jul 2006
Externally publishedYes

Keywords

  • Antibacterial
  • Dental composite
  • Nanoparticles
  • Polyethylenimine
  • Quaternary ammonium

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