Kinetic Release of Hydrogen Peroxide from Different Whitening Products

da Silva Marques, Duarte Nuno; Lourenço Silveira, João Miguel; Oliveira Faria Marques, Joana Rita; Almeida Amaral, João; Marques Guilherme, Nuno; Pereira da Mata, António Duarte Sola
September 2012
European Journal of Esthetic Dentistry;Autumn2012, Vol. 7 Issue 3, p344
Academic Journal
The objective of this in vitro study was to evaluate the kinetics of hydrogen peroxide(HP) release from five different bleaching products: VivaStyle R 10%fitted tray gel, VivaStyle R 30% in-office bleaching gel, VivaStyle R Paint-On Plus paint-on bleaching varnish, Opalescence PFR 10% carbamide peroxidegel and Treswhite Supremeâ„¢ 10% HPgel. Each product was firstly titrated for its HP content by a described method.HP release kinetics was assessed by a modified spectrophotometric technique.One sample t test was performed to test for differences between the manufacturers'claimed HP concentrations and the titrated HP content in the whitening products. Analysis of variance plus Tamhane's post hoc tests and Pearson correlation analysis were used as appropriate.Values of P < 0.05 were taken a significant.Titrated HP revealed an increased content when compared to the manufacturer'sspecifications for all the products tested (P < 0.05), although only products from one manufacturer producedsignificantly higher results. All products presented a significant (P < 0.05) and sustained release of HP. However, the product with paint-on cellulose-based matrix resulted in significantly (P < 0.05)faster kinetics when compared to other products tested. These results are consistent with manufacturers' reduced recommendedapplication times.The results of this study suggest that modifying the matrix composition maybe a viable alternative to HP concentrationincrease, since this may result in faster release kinetics without exposure to high HP concentrations,


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