PURPOSE: This study evaluated the efficacy of tooth whitening and color stability at different time periods after treatment. MATERIALS AND METHODS: Blocks obtained from human molars were divided into 15 groups (n = 5) by bleaching agents: 35% hydrogen peroxide (Whiteness HP and Opalescence Xtra) and 37% carbamide peroxide (Whiteness Super); and light sources: halogen lamp and plasma arc lamp (bleach mode), LED/diode laser, argon laser, and no light source. The efficacy of bleaching was measured using a spectrophotometer. Six bleaching sessions were performed (times 1 to 6). The specimens were submitted to another reading 7, 15, and 30 days after the end of bleaching (times 7, 8, and 9). The results were submitted to ANOVA followed by Tukey test and polynomial regression (p < 0.05). RESULTS: Carbamide peroxide significantly differed from hydrogen peroxide, presenting low reflectance values. Activated versus non-activated bleaching did not differ significantly for any gel tested, except for Whiteness HP activated by argon laser, which presented the lowest mean reflectance values. The results obtained with hydrogen peroxide revealed a decrease in reflectance values one month after the end of treatment. For carbamide peroxide, this decrease was not observed. CONCLUSION: The halogen lamp presented the same or higher efficacy than non-activated bleaching, which had a longer gel contact period. When hydrogen peroxide was used, a decrease in reflectance values was observed 30 days after the end of bleaching.
PURPOSE: This study evaluated the efficacy of tooth whitening and color stability at different time periods after treatment. MATERIALS AND METHODS: Blocks obtained from human molars were divided into 15 groups (n = 5) by bleaching agents: 35% hydrogen peroxide (Whiteness HP and Opalescence Xtra) and 37% carbamide peroxide (Whiteness Super); and light sources: halogen lamp and plasma arc lamp (bleach mode), LED/diode laser, argon laser, and no light source. The efficacy of bleaching was measured using a spectrophotometer. Six bleaching sessions were performed (times 1 to 6). The specimens were submitted to another reading 7, 15, and 30 days after the end of bleaching (times 7, 8, and 9). The results were submitted to ANOVA followed by Tukey test and polynomial regression (p < 0.05). RESULTS:Carbamide peroxide significantly differed from hydrogen peroxide, presenting low reflectance values. Activated versus non-activated bleaching did not differ significantly for any gel tested, except for Whiteness HP activated by argon laser, which presented the lowest mean reflectance values. The results obtained with hydrogen peroxide revealed a decrease in reflectance values one month after the end of treatment. For carbamide peroxide, this decrease was not observed. CONCLUSION: The halogen lamp presented the same or higher efficacy than non-activated bleaching, which had a longer gel contact period. When hydrogen peroxide was used, a decrease in reflectance values was observed 30 days after the end of bleaching.
Authors: Petra Hahn; Nina Schondelmaier; Martin Wolkewitz; Markus Jörg Altenburger; Olga Polydorou Journal: Odontology Date: 2012-03-01 Impact factor: 2.634
Authors: Roeland Jozef Gentil De Moor; Jeroen Verheyen; Peter Verheyen; Andrii Diachuk; Maarten August Meire; Peter Jozef De Coster; Mieke De Bruyne; Filip Keulemans Journal: ScientificWorldJournal Date: 2015-03-22
Authors: Maria B F D'Arce; Débora A N L Lima; Flávio H B Aguiar; Carlos E S Bertoldo; Gláucia M B Ambrosano; José R Lovadino Journal: J Clin Exp Dent Date: 2013-04-01
Authors: Rafael Francisco Lia Mondelli; Juliana Felipi David E Góes de Azevedo; Ana Carolina Francisconi; Cristiane Machado de Almeida; Sérgio Kiyoshi Ishikiriama Journal: J Appl Oral Sci Date: 2012 Jul-Aug Impact factor: 2.698