Cătălina Iulia Săveanu, Margarita Coliban, Adina Oana Armencia, Daniela Anistoroaei, Alexandra Ecaterina Săveanu, Irina Bamboi, Loredana Liliana Hurjui
Hydrogen peroxide (PH) is the main active substance used in current bleaching treatments. the mechanism of the bleaching reaction is based on the ability of PH to penetrate the enamel surface followed by its degradation into free radicals that will oxidize dentin-fixed chromogens releasing several types of intermediates: free radicals and hydroperoxyl anions. The dissociation of the peroxide and the type of intermediate product varies depending on the temperature, the concentration of the peroxide, the pH of the bleaching solution and the presence of co-catalysts. The study was performed in vitro on a number of 22 patients. Patients were given PH-40% with 1.1% fluorine and 3% potassium nitrate in two successive applications in a single session. Statistical data processing was performed with the SPSS 14 program for Windows, with the t-students paired test establishing a statistical significance threshold of p≤0.05. Within the limits of this study, it can be concluded that the effect of in vitro use of 40% hydrogen peroxide was immediate and statistically significant on average with a difference of five shades on the analog visual scale.