Silver doped titanium dioxide nanoparticles as antimicrobial additives to dental polymers

C Chambers, S Stewart, Bo Su, Howard E Jenkinson, Jonathan Sandy, Anthony Ireland*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

27 Citations (Scopus)
348 Downloads (Pure)

Abstract

Objective

The objectives of this in vitro study were to produce a filled resin containing Ag–TiO2 filler particles and to test its antibacterial properties.

Methods

Ag–TiO2 particles were manufactured using the ball milling method and incorporated into an epoxy resin using a high speed centrifugal mixer. Using UV/vis spectrophotometry investigations were performed to assess how the photocatalytic properties of the Ag–TiO2 particles are affected when encased in resin. Adopting the bacteria colony counting technique, the antibacterial properties of Ag–TiO2 particles and Ag–TiO2 containing resins were assessed using Streptococcus mutans under varying lighting conditions.

Results

Ag doping of TiO2 results in a band gap shift towards the visible spectrum enabling Ag–TiO2 to exhibit photocatalytic properties when exposed to visible light. Small quantities of Ag–TiO2 were able to produce a bactericidal effect when in contact with S. mutans under visible light conditions. When incorporated into the bulk of an epoxy resin, the photocatalytic properties of the Ag–TiO2 particles were significantly reduced. However, a potent bactericidal effect was still achieved against S. mutans.

Significance

Ag–TiO2 filled resin shows promising antimicrobial properties, which could potentially be used clinically.

Original languageEnglish
Pages (from-to)e115–e123
Number of pages9
JournalDental Materials
Volume33
Issue number3
Early online date10 Dec 2016
DOIs
Publication statusPublished - Mar 2017

Keywords

  • Silver doped titanium oxide
  • Resin
  • Antimicrobial

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