アブストラクト（39巻1号：The Bulletin of Kanagawa Dental College）

The Bulletin of Kanagawa Dental College

English

Title　： Application of Titanium Dioxide Photocatalyst Reaction in a Tooth-bleaching Agent
Subtitle　： BKDC CLINICAL AND RESEARCH TOPICS: New Technology: TiO2 Photocatalyst and Dental Materials Applied Research
Authors　： Fumihiko Yoshino
Authors（kana）　：
Organization　： Division of Pharmacology & ESR Laboratories, Department of Clinical Care Medicine, Kanagawa Dental College
Journal　： The Bulletin of Kanagawa Dental College
Volume　： 39
Number　： 1
Page　： 45-47
Year/Month　： 2011 / 3
Article　： Report
Publisher　： Kanagawa Odontological Society
Abstract　： [Abstract] About 30% of the hydrogen peroxide (H2O2) used in clinical dentistry is applied for the purpose of tooth bleaching. The details of bleaching mechanism are not clear in spite of having considered the tooth- bleaching mechanism involving the reactive oxygen species (ROS) generated from H2O2. Therefore, in this study, for tooth bleaching, we used ROS generated in a titanium dioxide (TiO2) photocatalyst reaction with 0.3% H2O2. Using electron spin resonance (ESR) spin trapping, we confirmed the kind of reactive oxygen species that is generated under experimental conditions. Consequently, we observed the generation of a superoxide anion radical (O2・-) from the TiO2 photocatalyst reaction with 0.3% H2O2 irradiated by ultraviolet (UV) light. Furthermore, O2・- generation increased in a UV light irradiation time-dependent manner. When these results were taken into account in tooth bleaching, there was an increase in the L value and ΔE*ab value, such as the marker of brightness (trend). These results suggested that the tooth bleaching is possible even with a bleaching agent that uses TiO2 with a low concentration of H2O2.
Practice　： Dentistry
Keywords　： Reactive oxygen species, Superoxide, Hydroxyl radical, Tooth bleaching, Hydrogen peroxide