SCIENTIFIC ARTICLE Australian Dental Journal 2012; 57: 213–219 doi: 10.1111/j.1834-7819.2012.01683.x Tooth whitening with hydrogen ⁄ carbamide peroxides in association with a CPP-ACP paste at different proportions AAM de Vasconcelos,* AGG Cunha,* BCD Borges,* CT Machado,* AJS dos Santos* *School of Dentistry, Potiguar University (Laureate International Universities), Natal, Brazil. ABSTRACT Background: Different enhanced peroxide formulations have been developed to overcome mineral loss during tooth whitening. This study investigated the impact on tooth whitening from combining a CPP-ACP paste with home peroxide agents at several proportions. Methods: Ninety bovine incisors were randomly allocated into nine groups (n = 10) and exposed to 7.5% hydrogen peroxide (HP), 16% carbamide peroxide (CP), a CPP-ACP paste (Tooth Mousse ⁄ MI Paste, GC Corporation, Tokyo, Japan) and blends of HP ⁄ CP:MI at three proportions (1:1, 2:1 and 1:2). Tooth whitening was performed for 14 days and its effectiveness was measured by a spectrophotometer utilizing the CIE L*a*b* system (DE, DL*, Da* and Db*). Colour readings were measured at baseline (T0), 7 days of bleaching (T7), 14 days of bleaching (T14) and 7 days after the end of bleaching (T21). Data were analysed by two-way ANOVA for paired averages followed by the Tukey’s test and Pearson’s correlation at 5%. Results: Although CP produced the greatest colour change (DE), all whitening protocols were considered to be effective regardless of the CPP-ACP presence. In general, greater changes in DE, DL*, Da* and Db* were detected at T14, with T21 exhibiting similar results to those at T7. A greater number of strong correlations with DE values was found for a* (11 ⁄ 15). Conclusions: Within the limitations of this study, the results indicate that the CPP-ACP paste did not affect tooth whitening efficacy. Keywords: CPP-ACP, tooth whitening, carbamide peroxide, hydrogen peroxide, colour change. Abbreviations and acronyms: CIE = Commission Internationale de l’Eclairage; CPP-ACP = casein phosphopeptide-amorphous calcium phosphate. (Accepted for publication 6 October 2011.) INTRODUCTION Seeking a more aesthetically pleasing smile has become quite common among patients in the last few decades, 1 and tooth colour stands out as one of their top concerns. 2 With careful diagnosis and appropriate attention to technique, tooth whitening can be consid- ered a conservative and safe approach to treat discol- oured teeth. 3 Home bleaching techniques have received worldwide acceptance 4 after being described for the first time in 1989 by Haywood and Heymann. 5 It is now a common practice to whiten discoloured teeth using low concentrations of carbamide and hydrogen peroxides. 1,6 Several methods have been available to evaluate the efficacy of tooth whitening: shade guides, photogra- phy, colorimeters, spectrophotometers and computer digitization. 7–9 The CIE L*a*b* system provides a useful tool for quantifying colour properties of teeth and it is believed to be the most complete colour space according to the Commission Internationale de l’Eclairage (CIE). 10 Bleached teeth have increased L* values with subsequent reduction in b* values whilst a* values are known to have a minimal influence on this process. 11–13 Despite such reports, few studies have found a linear correlation between each of the L*a*b* parameters and the colour variations expressed in DE in an attempt to establish which of the parameters could strongly influence the total colour change of a tooth. When it comes to tooth whitening, sensitivity is still the most common adverse effect. According to this ª 2012 Australian Dental Association 213 Australian Dental Journal The official journal of the Australian Dental Association
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Related Documents
