Nitrogen doped titanium dioxide as an aesthetic antimicrobial filler in dental polymers

N. A. Ahmad Fauzi, Anthony J Ireland, Martyn Sherriff, H M H N Bandara, Bo Su*

*Corresponding author for this work

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

18 Citations (Scopus)
117 Downloads (Pure)

Abstract

Objective:
To develop an aesthetic resin composite using a nitrogen-doped titanium dioxide (N-TiO2) filler that possesses antibacterial properties against Streptococcus mutans.

Methods:
N-TiO2 powder was manufactured by calcining commercial TiO2 with urea. Free radical release from the N-TiO2 powder under visible light irradiation was analysed using UV-Vis spectrophotometry. The N-TiO2 powder was incorporated into a dental resin and the photocatalytic activity assessed using a dye under both visible light and dark conditions. The metabolic activity of Streptococcus mutans grown on the N-TiO2/resin composite discs was quantified by XTT reduction assay to assess the antibacterial properties of the resin.

Results:
Doping nitrogen of TiO2 resulted in a band gap shift towards the visible light spectrum, which enabled the powder to release reactive oxygen species when exposed to visible light. When incorporated into a dental resin, the N-TiO2/resin composite still demonstrated sustained release of reactive oxygen species, maintaining its photocatalytic activity and showing an antibacterial effect towards Streptococcus mutans under visible light compared to dark conditions (P<0.05).

Significance:
N-TiO2 filled resin composite shows great promise as a potential aesthetic resin-based adhesive for orthodontic bonding.
Original languageEnglish
Pages (from-to)147-157
Number of pages11
JournalDental Materials
Volume38
Issue number1
Early online date24 Nov 2021
DOIs
Publication statusPublished - 19 Jan 2022

Bibliographical note

Publisher Copyright:
© 2021 The Academy of Dental Materials

Keywords

  • Nitrogen doped titanium dioxide
  • Antibacterial
  • Dental adhesive
  • Orthodontics

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