Evaluation of two types of bleaching gel and light source on whitening of teeth

Abstract

Today, increasing desire for tooth brightening, make bleaching gel and light sources as a popular method for tooth whitening. The aim of this study was effect of combination of bleaching gel and light source on the teeth whitening. In this study 60 healthy human anterior teeth were randomly dividedin three groups (n=20). The fi rst groupwas withoutlight, the second one LED andon the third group QTH light was used. Each group was divided into two subgroups whichhad two types of hydrogen peroxide bleaching gelsincluding 37.5% Pola offi ce and 40% Opalescence Boost which were applied to them. The primary colors of teeth were measured, and then kept intea (200ml) for 7 days. After that each tooth color was measured for the second time. The teeth were bleached according to the protocol of each group: Immediately, after 3, 7 and 30 days they were measured by spectrophotometer. Data were analyzed by statistical software SPSS 20 and One-way ANOVA and Tukey testin alpha 0.05. Bleaching effectiveness of QTH signifi cantly was increasedin both of bleaching gels as compared to LED and without using of light, at different times: instantly, 3 days and 7 days after bleaching, a month after bleaching, signifi cant differences between the different methods was not seen. The results of this study showed thatin-offi ce bleaching, with or without light is an effective method of beaching. QTH Light in the short term (one week) showed signifi cant impact on teethwhitening in both bleach gel. However, within a month therewere no signifi cant differences in all groups.