Abstract
This in vitro study evaluated the effectiveness of whitening dentifrices for the removal of extrinsic tooth stains. Twenty dental blocks (4 x 4 mm), including enamel and dentine, removed from freshly extracted bovine incisors, were randomly divided into 4 groups: G1--distilled water, G2--Colgate, G3--Crest Extra Whitening and G4--Rapid White. In all specimens, the dentin was covered with colorless nail polish, and the enamel was left exposed. Next, the specimens were immersed in a solution of black tea, which was changed every 24 h, for a period of 6 days. After this period, a photo-reflectance reading was taken (Time 1) with a spectrometer. The stained specimens were then submitted to linear brushing movements (5,000 cycles) using brushes (Oral B-Soft) coupled to an automatic toothbrushing machine, under a static axial load of 200 g and with a speed of 4 movements/second, at 37 degrees C, with the dentifrice or water being injected every 60 s. When toothbrushing ended, a second photo-reflectance reading was taken (Time 2). The results were submitted to two-criteria analysis of variance (ANOVA) and to the Tukey test ( = 0.05). When the two times for a same group were compared, Time 2 presented the highest reflectance values with statistical difference only for G3 and G4. Among the dentifrices tested, only the Rapid White group differed from the control group, presenting the highest reflectance values. Only the whitening dentifrice Rapid White was effective for the removal of extrinsic stains.
Highlights
Patients increasingly seek to have an attractive smile, as it is considered to be synonymous with health
Considering the fast development of new whitening products and their growing use by patients, this study aimed to evaluate the effectiveness in vitro of whitening dentifrices for extrinsic tooth stain removal
The results were submitted to two-criteria analysis of variance (ANOVA), the factors being dentifrice and time, and to the Tukey test at a 5% significance level
Summary
Patients increasingly seek to have an attractive smile, as it is considered to be synonymous with health. This growing demand for enhanced esthetic appearance has led to great development of bleaching products.[1] before any of the bleaching products available on the market can be used, it is first necessary to look into the etiology of dental discoloration.[2]. Extrinsic pigmentations can originate from a smoking habit, from the use of certain cationic agents, such as chlorexidine, and from a diet rich in coloring foods.[3] When beverages, such as coffee and tea, are frequently consumed, colors are deposited on the plaque and biological film present on the enamel surface, leading to tooth discoloration.[4]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
