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Atmospheric Pressure Plasma Jet Composed of Three Electrodes: Application to Tooth Bleaching
Author(s) -
Lee Hyun Woo,
Nam Seoul Hee,
Mohamed AbdelAleam H.,
Kim Gyoo Cheon,
Lee Jae Koo
Publication year - 2010
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.200900083
Subject(s) - electrode , plasma , analytical chemistry (journal) , dielectric barrier discharge , chemistry , jet (fluid) , atmospheric pressure , atmospheric pressure plasma , excited state , hydrogen peroxide , materials science , torr , atomic physics , chromatography , physics , oceanography , organic chemistry , quantum mechanics , thermodynamics , geology
Three‐electrode plasma jet system consisting of a perforated dielectric tube with two outer and one floating inner electrodes was developed and employed for tooth bleaching. Lowered gas breakdown voltage and increased discharge current were achieved by using the floating inner electrode. Optical emission spectra analysis showed that the rotational temperature of the second positive nitrogen bands was ≈290 K and vibrational temperature was ≈2 500 K, which means this plasma is in highly non‐quilibrium state and nonthermal. The presence of excited He, N 2 , N 2 +and O in the plasma plume was revealed. The plasma jet was used in combination with hydrogen peroxide (H 2 O 2 ) to remove stains from extracted teeth stained by either coffee or red wine. Combining the plasma jet and H 2 O 2 improved the bleaching efficacy by a factor of 3.1 (coffee) and 3.7 (red wine) compared with using H 2 O 2 alone.