In vitro evaluation of the whitening effect of mouth rinses containing hydrogen peroxide

• Published in: Brazilian oral research Vol. 26; no. 3; pp. 269 - 274
• Main Authors: Lima, Fábio Garcia, Rotta, Talita Aparecida, Penso, Sonara, Meireles, Sônia Saeger, Demarco, Flávio Fernando
• Format: Journal Article
• Language: English
• Published: Brazil Sociedade Brasileira de Pesquisa Odontológica - SBPqO 01.06.2012; Sociedade Brasileira de Pesquisa Odontológica
• Subjects: Color; Dentistry; DENTISTRY, ORAL SURGERY & MEDICINE; Humans; Hydrogen Peroxide; Hydrogen Peroxide - chemistry; Hydrogen Peroxide - pharmacology; Mouthwashes; Mouthwashes - chemistry; Mouthwashes - pharmacology; Random Allocation; Reproducibility of Results; Saliva, Artificial; Time Factors; Tooth Bleaching; Tooth Bleaching - methods; Tooth Bleaching Agents - chemistry; Tooth Bleaching Agents - pharmacology; Tooth Discoloration - therapy; Mouthwashes; Hydrogen Peroxide; Tooth Bleaching
• DOI: 10.1590/s1806-83242012000300014
• ISSN: 1806-8324; 1807-3107

The aim of this study was to evaluate the bleaching effect of two mouth rinses containing hydrogen peroxide. Thirty premolars were randomly divided into two groups (n = 15): Listerine Whitening (LW) and Colgate Plax Whitening (PW). The teeth were fixed on a wax plate and with acrylic resin, at a distance of 5 mm between each other, exposing the buccal surfaces. All teeth were stored in artificial saliva for 45 days, being removed twice a day to be immersed for 1 min in each mouthwash, followed by 10-second washing in tap water. The pH of each product was measured. Digital images of each tooth were captured under standardized conditions. These images were cut in areas previously demarcated and analyzed in Adobe Photoshop 7.0 using the CIEL*a*b* color space system. Data were statistically analyzed by a paired t test and an independent samples t test (p < 0.05). The pH values were 5.6 and 3.4 for LW and PW, respectively. Both treatment groups showed a decrease in the b* parameter (p < 0.01), but a decrease of a* was observed only for PW (p < 0.01). While the LW group showed an improvement in lightness (L*) (p = 0.03), the PW group had a decrease in the L* parameter (p = 0.02). Within the limitations of this study, it is possible to conclude that both products caused some degree of whitening; however, extreme care should be taken when using Colgate Plax Whitening, since its decline in luminosity might be due to its lower pH.