Photocatalytic Antibacterial Effect of TiO2 Film of TiAg on Streptococcus mutans

Choi, Jung Yoon; Chung, Chooryung J.; Oh, Keun Taek; Choi, Yoon Jeong; Kim, Kyung Ho

doi:10.2319/012108-169.1

Cited by 28 publications

(14 citation statements)

References 23 publications

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“…The anodic oxidation was utilized in this study to enable anatase crystal formation rather than rutile crystal formation. We thought that this method would be more suitable based on the conclusion of the studies by Choi et al (2009). These compared the 2 methods and stated that greater and more rapid antibacterial activity was achieved by anodic oxidation, with stronger reduction in numbers in bacterial counts.…”

Section: Discussionmentioning

confidence: 99%

“…). It is also commonly stated that anatase crystals have the highest photocatalytic activity among the crystal types of TiO 2 (Choi et al, 2007;Chun et al, 2007;Horiuchi et al, 2007;Choi et al, 2009;Özyildiz et al, 2010). Since traditional methods present problems with observing the crystal structure of the coated thin films, we used GIXRD and a separate glass slide, which was coated under the same conditions as the arch wires (Hamid, 2003).…”

Section: Al 2009mentioning

confidence: 99%

“…Several compounds exist that are capable of photocatalytic degradation of microorganisms, although TiO 2 has gained the most popularity amongst the other photocatalysts for its chemical stability as well as its property of not being hazardous to health (Chun et al, 2007;Akhavan, 2009). Although it has 3 crystal structures that can be produced by different oxidation procedures, the anatase form has the highest reactivity (Horiuchi et al, 2007;Akhavan, 2009;Choi et al, 2009;Sato et al, 2009). When TiO 2 anatase film is irradiated with wavelengths smaller than 385 nm of light, hydroxyl radicals are formed (Choi et al, 2007(Choi et al, , 2009.…”

Section: Introductionmentioning

confidence: 99%

“…Although it has 3 crystal structures that can be produced by different oxidation procedures, the anatase form has the highest reactivity (Horiuchi et al, 2007;Akhavan, 2009;Choi et al, 2009;Sato et al, 2009). When TiO 2 anatase film is irradiated with wavelengths smaller than 385 nm of light, hydroxyl radicals are formed (Choi et al, 2007(Choi et al, , 2009. Hydroxyl radicals are highly reactive when in contact with organic compounds (Choi et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic antimicrobial effect of TiO2 anatase thin-film–coated orthodontic arch wires on 3 oral pathogens

Özyıldız¹,

Uzel²,

Hazar³

et al. 2014

Turk J Biol

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The aim of this study was to introduce antimicrobial activity to stainless steel orthodontic arch wires by coating them with TiO2 in anatase form. Stainless steel (0.016 × 0.022 inch), D-rect (0.016 × 0.022 inch), and multistranded hammered retainer wires (0.014 × 0.018 inch) were coated with TiO2 anatase by the sol-gel dip coating method. The wires were assessed for their photocatalytic antimicrobial activity against Streptococcus mutans, Candida albicans, and Enterococcus faecalis. After illumination under UVA (315– 400 nm) at 1.0 mW/cm2 for 1 h, the reduction efficiencies of the anatase-coated arch wires were calculated by using colony-forming unit counts. All anatase-coated arch wires showed remarkable inhibitor effects against the test microorganisms under UVA. The most efficient wire on S. mutans was the stainless steel wire, with a 99.99% reduction in growth, but multistranded hammered retainer wire was the most active against both C. albicans and E. faecalis, with 98.0% and 91.68% reduction rates, respectively. TiO2-coated arch wires exposed to UVA illumination showed significant antimicrobial activity when compared with uncoated samples and coated, but not UVA-exposed, samples. Our results suggest that the antimicrobial effect of TiO2-coated arch wires in long-lasting orthodontic treatments would be beneficial for the prophylaxis of caries

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Section: Discussionmentioning

confidence: 99%

Section: Al 2009mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photocatalytic antimicrobial effect of TiO2 anatase thin-film–coated orthodontic arch wires on 3 oral pathogens

Özyıldız¹,

Uzel²,

Hazar³

et al. 2014

Turk J Biol

View full text Add to dashboard Cite

show abstract

“…22 Numerous studies have been performed evaluating the antibacterial effects of photoactivated titanium oxides against common bacteria, such as E. coli and various streptococcus species. 11,25,26 However, relatively few studies have examined the effect on Staphylococci species, which are the most prevalent species associated with implant-related infections. 4,26 In addition to the antibacterial effect, photoactivation of titanium oxides has also been shown to effectively degrade organic compounds and dyes.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic activity and antibacterial efficacy of UVA-treated titanium oxides

et al. 2020

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Studies have shown ultraviolet-A (UVA) irradiation of crystalline titanium oxides leads to the production of reactive oxygen species (ROS) via a photocatalytic process. The ROS exhibit antimicrobial properties that may be of benefit in preventing bacterial attachment to implant devices. Recent studies have suggested a potential benefit of mixed anatase and rutile oxides and dopants on the photocatalytic properties of titanium oxides. The goal of this work was to compare the photocatalytic activity of different anodized commercially pure titanium grade 4 (CPTi4) surfaces. CPTi4 specimens were anodized in three mixed-acid electrolytes to create crystalline oxide surfaces that were either primarily anatase, primarily rutile, or a combination of anatase and rutile. Additionally, the primarily anatase and combination oxides incorporated some phosphorous from the phosphoric acid component in the electrolyte. The photocatalytic activity of the anodized specimens was measured using both methylene blue (MB) degradation assay and comparing the attachment of S. aureus under irradiation with UVA light of differing intensities (1 mW/cm2, 8 mW/cm2, and 23 mW/cm2). Primarily rutile oxides exhibited significantly higher levels of MB degradation after exposure to 1 mW/cm2 UVA lights. Primarily rutile specimens also had the largest reduction in bacterial attachment followed by the mixed phase specimens and the primarily anatase specimens at 1 mW/cm2 UVA lights. Phosphorous-doped, mixed phase oxides exhibited an accelerated MB degradation response during exposure to 8 mW/cm2 and 23 mW/cm2 UVA lights. All anodized and unanodized CPTi4 groups revealed similar S. aureus attachment at the two higher UVA intensities. Although MB degradation assay and the bacteria attachment assay both confirmed photocatalytic activity of the oxides formed in this study, the results of the MB degradation assay did not accurately predict the oxides performance against S. aureus.

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Photofunctionalization of anodized titanium surfaces using UVA or UVC light and its effects against Streptococcus sanguinis

et al. 2017

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UV light preirradiation of anodized titanium oxide layers has recently been shown to produce a photocatalytic effect that may reduce early bacterial attachment on titanium surfaces. Streptococcus species have been identified as primary early colonizers and contribute to early biofilm formation on dental implant surfaces. Anodized layers with primarily amorphous, primarily anatase, primarily rutile, and mixtures of anatase and rutile phase oxides were preirradiated with UVA or UVC light for 10 min. Nanoscale surface roughness and pre- and post-UV-irradiated wettability were measured for each anodization group. Sample groups were subjected to streptococcus sanguinis for a period of 24 h. Bacterial attachment and killing efficacy were measured and compared to the corresponding non-UV control groups. UVA treatments showed trends of at least a 20% reduction in bacterial attachment regardless of the crystallinity, or combination of oxide phases present. Anodized layers consisting of primarily anatase phase on the outermost surface were shown to have a killing efficacy of at least 50% after preirradiation with UVA light. Anodized layers containing disperse mixtures of anatase and rutile phases at the outermost surface showed at least a 50% killing efficacy after pre-irradiation with either UVA or UVC light. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 2284-2294, 2018.

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Photocatalytic Antibacterial Effect of TiO2 Film of TiAg on Streptococcus mutans

Cited by 28 publications

References 23 publications

Photocatalytic antimicrobial effect of TiO2 anatase thin-film–coated orthodontic arch wires on 3 oral pathogens

Photocatalytic antimicrobial effect of TiO2 anatase thin-film–coated orthodontic arch wires on 3 oral pathogens

Photocatalytic activity and antibacterial efficacy of UVA-treated titanium oxides

Photofunctionalization of anodized titanium surfaces using UVA or UVC light and its effects against Streptococcus sanguinis

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