Abstract

TEO, Tatiana Baú; TAKAHASHI, Marcos Kenzo; GONZAGA, Carla Castiglia  and  LOPES, Maria da Graça Kfouri. Postbleaching color change evaluation of bovine teeth immersed in high-pigmentation potential solutions. RSBO (Online) [online]. 2010, vol.7, n.4, pp. 401-405. ISSN 1984-5685.

INTRODUCTION: Dental bleaching is one of the most commonly used aesthetic treatments in dentistry nowadays. However, subclinical changes in the surface micromorphology of dental tissues may occur after bleaching, leading to a greater easiness of tooth staining in the period immediately after its completion. OBJECTIVE: To evaluate the color change of bovine teeth immersed in four solutions with high-pigmentation potential, after tooth whitening. MATERIAL AND METHODS: Fifty bovine teeth were bleached using a 35% hydrogen peroxide gel. Color analysis was performed by a digital spectrophotometer for the acquisition of CIELab parameters. Teeth were divided into 5 groups and immersed in the following solutions (n = 10): distilled water (control), coffee, black tea, red wine and cola soft drink, for 1 h/day, during 15 days. Teeth were again submitted to color analysis and the color differences (E) between the first and second reading were calculated. Data were subjected to ANOVA and Tukey's test (α = 5%). RESULTS: Among all the substances tested, black tea provoked the highest color difference (18.49), followed by red wine (16.41), cola soft drink (15.73), and coffee (9.37). CONCLUSION: All high-pigmentation potential solutions were able to promote the staining of bovine teeth. However, black tea, red wine, and cola soft drink produced the highest color differences.

Keywords : tooth whitening; tooth staining; discoloration.