Abstract

OLIVEIRA, Gardenia Mascarenhas et al. Instrumental color analysis using digital photography after tooth bleaching. Rev. Assoc. Paul. Cir. Dent. [online]. 2015, vol.69, n.4, pp. 396-404. ISSN 0004-5276.

The purpose of this study was to evaluate the effectiveness of tooth bleaching by instrumental color analysis using digital photographs. 54 patients were divided into three groups: GI (hydrogen peroxide 35% + LED) GII (hydrogen peroxide 35% + calcium) and GIII (hydrogen peroxide 15% + LED). The color was assessed in instrumental form, through a spectrophotometer (VITA Easyshade) and digital photos (Adobe Photoshop program) and subjective, with the scales VITAPAN Classical and VITA 3D Master. There were two sessions of bleaching and all protocols followed the recommendations of the manufacturers of the products. A visual evaluation questionnaire of tooth sensitivity as a way to validate the safety of the treatments was applied. The groups were compared using the Student t test, with a confidence level of 95% (p <0.05), ANOVA and Tukey test. The results of the CIELab* values showed no statistically significant differences in L* (p = 0.68) and b * (p = 0.09), but to a * (p <0.01) when comparing the analysis of color measured by digital photographs and the spectrophotometer. In all groups there was a significant reduction in yellowness (Δb) and increased brightness (ΔL) demonstrating the effectiveness of whitening. There was more sensitive in Group I (p= 0.002). Gauging the color using digital photography became an appropriate tool to evaluate the effectiveness of tooth whitening as compared with the spectrophotometer. However it should be used in conjunction with other measurement methods already established in clinical routine.

Keywords : tooth bleaching; photography; dental; spectrophotometers.