The Bleaching Efficiency and Safety of Plasma Activated Water

Objectives: The aim of this study was to investigate the whitening efficiency and biosecurity of non-thermal plasma activated water (PAW) and/or assisted by low concentration hydrogen peroxide (H₂O₂).
Methods: Thirty-Six bovine central incisor crowns were stained by black tea, then randomly assigned to four groups (n=9), and immersed respectively by PAW alone (A), 3% H₂O₂ alone (B), 30% H₂O₂ alone (C) and PAW+3% H₂O₂ (D). CIE Lab spectrophotometric measurements were taken at baseline, 15min, 30min, 1h, 2h and 3h of bleaching treatment respectively. Histologic study was conducted to evaluate the biosecurity of the all above bleaching agents by topical application on hamster cheek pouch.
Results: PAW+3% H₂O₂ was significantly more effective than the PAW or 3% H₂O₂ alone for tooth bleaching (p< 0.01), and PAW+3% H₂O₂ had equal or better effect on tooth bleaching than 30% H₂O₂ for 2h treated. Histologic study indicated that PAW+3% H₂O₂ was mild and less-stimulated compared to 30% H₂O₂, which could avoid the chemical burns of the mucous membrane.
Conclusions: Non-thermal plasma activated water (PAW) mixed with a low concentration of H₂O₂ could be an effective and safe method for tooth bleaching.