Basic ResearchDepletion Rate of Hydrogen Peroxide from Sodium Perborate Bleaching Agent
Section snippets
Preparation
Two brands of sodium perborate powders were used: Odontobleach (ODB) (Australian Dental Manufacturing, Kenmore Hills, Queensland, Australia) and Dentalife Endosure Perborate Micro (END) (Endosure Perborate Micro; Dentalife, Ringwood, Victoria, Australia). Initially, the intention was to include 2 g/mL as recommended for clinical use of sodium perborate (26), and a pilot study was developed to determine if this was feasible. Sodium perborate samples (ODB and END) were used at 1, 2, and 3 g/mL
Results
The first 27 hours showed a rapid increase in the concentration of H2O2, produced, which peaked at 27 hours before beginning to decline (Fig. 2). This rapid depletion continued until the concentration plateaued at about 3 days (75 hours); at this point, an equilibrium was reached in which the net production and depletion were equal (Fig. 3). Beyond 3 days, there remained a low level of H2O2 up to the last time point of 28 days. At 336 hours, ODB200 was not included in the analysis because it
Discussion
Despite the wide use of sodium perborate and water as an intracoronal bleaching agent, little is known about the dynamics of the reaction itself. Previous literature indicates that a pH change occurs over time after mixing sodium perborate with water (29). It is known that the addition of water to sodium perborate results in the release of H2O2, sodium metaborate (NaBO3), and nascent oxygen (20). The H2O2 decomposes into radicals and ions (20), and these radicals are responsible for oxidation,
Acknowledgments
The authors would like to thank Dr Samantha Byrne, Prof Stuart Daspher, Dr Harry Mohan, and Assoc Prof Menaka Abuzar for their support.
Supported by the Melbourne Dental School, The University of Melbourne.
The authors deny any conflicts of interest related to this study.
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