Generation of free radicals and/or active oxygen by light or laser irradiation of hydrogen peroxide or sodium hypochlorite
| Autor: | Yasuhisa Tsujimoto, Naoki Senda, Kohji Kawamoto, Midori Kashima-Tanaka, Koichi Ito, Muneyoshi Yamazaki |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
inorganic chemicals
Time Factors Free Radicals Light Sodium Hypochlorite Radical Inorganic chemistry Photochemistry law.invention Cyclic N-Oxides chemistry.chemical_compound law Irradiation Hydrogen peroxide General Dentistry Spin trapping Hydroxyl Radical Lasers Electron Spin Resonance Spectroscopy Hydrogen Peroxide Laser Halogen lamp chemistry Sodium hypochlorite Hydroxyl radical Spin Labels sense organs Reactive Oxygen Species Spin Trapping |
| Zdroj: | Journal of endodontics. 29(2) |
| ISSN: | 0099-2399 |
| Popis: | Generation of free radical and/or active oxygen by light or laser irradiation of hydrogen peroxide (H2O2) or sodium hypochlorite (NaClO), which have been used for tooth whitening or root canal irrigation, was investigated using electron spin resonance spectroscopy combined with a spin-trapping technique. When H2O2 was exposed to light or laser radiation, the amount of hydroxyl radical generated changed according to the concentration of H2O2 and irradiation time. The amount of 5,5-dimethyl-1-pyrrolidone-(2)-oxyl-(1) (DMPO-X) also changed in accordance with irradiation time. The amounts of hydroxyl radical generated from H2O2 after irradiation were in the order: plasma lamp > halogen lamp > He-Ne laser > Yellow He-Ne laser. On the other hand, the amounts of DMPO-X generated from NaClO after irradiation were in the order: plasma lamp > Yellow He-Ne laser > halogen lamp > He-Ne laser. |
| Databáze: | OpenAIRE |
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