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Organic degradation potential of a TiO2/H2O2/UV-Vis system for dental applications
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials. (Nanoteknologi och funktionella material)
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2017 (English)In: Journal of Dentistry, ISSN 0300-5712, E-ISSN 1879-176X, Vol. 67, 53-57 p.Article in journal (Refereed) Published
Abstract [en]

Abstract The combination of TiO2 and H2O2 under light activation constitutes a promising method for disinfection of dental prosthetics and implants, due to production of reactive oxygen species (ROS). The aim of this work was to investigate the organic degradation ability of TiO2 particles in combination with H2O2 and under light activation utilizing the organic dye rhodamine B (RhB). Five different types of TiO2 particles, consisting of anatase, rutile, or a mixture of these crystalline phases, were combined with H2O2 and RhB, and subsequently exposed to UV (365nm) or visible (405nm) light at an irradiance of 2.1mW/cm2. It was found that rutile in combination with low concentrations of H2O2 (1.0-3.5mM) resulted in a degradation of RhB of 96% and 77% after 10minutes exposure to 365nm and 405nm light, respectively, which was the highest degradation of all test groups. Control measurements performed without light irradiation or irradiation at 470nm, or without TiO2 particles resulted in little or no degradation of RhB. Low H2O2 concentrations (1.0 mM-3.5mM) and visible light (405nm) used in combination with rutile TiO2 particles showed the highest RhB degradation capacity. A combination of TiO2 particles and H2O2 exposed to low energy UV or high energy visible light has an organic degradation capability that could be utilized in applications to kill or inactivate bacteria on medical devices such as dental implants for treatment against, e.g., peri-implantitis.

Place, publisher, year, edition, pages
2017. Vol. 67, 53-57 p.
Keyword [en]
TiO, HO, Reactive oxygen species, Rhodamine B, Rutile
National Category
Nano Technology
Research subject
Engineering Science with specialization in Nanotechnology and Functional Materials
Identifiers
URN: urn:nbn:se:uu:diva-330202OAI: oai:DiVA.org:uu-330202DiVA: diva2:1144936
Available from: 2017-09-27 Created: 2017-09-27 Last updated: 2017-11-25

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http://www.sciencedirect.com/science/article/pii/S0300571217302154

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