Comparison of Effectiveness of Two 10% Carbamide Peroxide Tooth‐Bleaching Systems Using Spectrophotometric Measurements

Abstract

Mean deltaE values for Opalescence ranged from 5.03 to 8.92 and from 5.84 to 9.61 for Nite White. The most significant factor of the color change was b* followed by L* and a*. L* values were higher after bleaching, whereas values for both a* and b* decreased. There were no significant differences between the two systems examined (p < .05).

Color change of vital teeth exposed to bleaching performed with and without supplementary light

“…The nature of changes also corresponded to the ADA guidelines and literature: teeth became lighter (increase in DL*) and less chromatic (decrease in DC Ã ab ) after bleaching. [19][20][21]25 In addition, mean change in shade guide units for the VC system were the same as the instrumental findings, which supports the ADA recommendation that 1 ccu ¼ 1DE Ã ab ¼ 1 sgu. [19][20][21] The DE Ã ab values recorded for both with-and without light exceeded the 50:50% acceptability thresholds reported in other studies (DE Ã ab ¼ 2:7 26 and DE Ã ab ¼ 3:3 27 ).…”

In vitro evaluation of dental bleaching effectiveness using hybrid lights activation

“…We also observed that, despite the lack of significant differences in luminescence among the groups, the highest numerical values for this characteristic were to be found in the blue LED group, followed by the halogen light group. These outcomes affirm the findings of other authors who likewise find evidence of an increase in a* and b* after dental bleaching (21), and they contrast with Ishikawa-Nagai et al (15), who observed an increase in luminosity L*. The alteration in luminosity represents how much the tooth lightened as a result of treatment, since this color dimension represents the amount of white incorporated to the hue.…”

“…The coordinates a* and b* approach zero for neutral colors (white, gray) and increase in magnitude for more saturated and intense colors. This system enables both the numerical definition of a color and the calculation of differences between two colors (14,15). To evaluate the color alteration of the teeth, we used an intraoral dental spectrophotometer, Vita EasyShade ® (VITAZahnfabrik H. Rauter Gmbh & Co. KG, Bad Säckingen, Germany).…”

Monitoring dental erosion by colour measurement: An in vitro study

“…A study using a spectrophotometer showed comparable L* and a*, but higher b*. 18 Studies performed with a digital camera system gave comparable results, except for a lower a*, as did a similar in vitro study using a spectroradiometer. 12,19,20 The importance of illumination geometry may be seen from the differences between the colours measured in our hemisphere set-up and our clinical simulation set-up.…”