Spectrophotometric assessment of the effectiveness of Opalescence PF 10%: A 14-month clinical study

Abstract

Objectives: To evaluate the effectiveness of Opalescence PF 10% just after treatment, at 6-month follow-up and at a 14-month follow-up period. Methods: Opalescence PF 10% was applied nightly for 14 days. The color of teeth 11 and 21 of 17 subjects were measured with a spectrophotometer (L*; a*; b*) before treatment, just after treatment (14 days), after 6 months and after 14 months. Subjects were instructed to take note of any tooth sensitivity.Results: For all three components (L*, a* and b*) statistical significant differences ( p < 0.05) in the values between base-line, after treatment (14 days later), after 6 months and after 14 months were found (Wilcoxon Signed Rank Sum Test). The decrease in L* was about 20% after 6 months and about 50% after 14 months. The a* value decreased approximately 14% after 6 months but was worse after 14 months than at the beginning. The b* value decreased the least with about 9% after 6 months and about 8% after 14 months. The decrease in DE_ ab was _20% after 14 months. Less than 20% of the subjects experienced mild tooth sensitivity just after treatment.Conclusion: Significantly whiter teeth were found after treatment as well as after a 6-month follow-up period. The whiteness/brightness (L*) decreased with _50% after 14 months and the a* value with _50% after 7 months, while the yellowness (b* value) remained even after 14 months.Clinical implications: The product is an effective tooth whitener resulting in only low tooth sensitivity. Re-bleaching could be done at about 14 months.

A Clinical Study of the Effectiveness of Two Different 10% Carbamide Peroxide Bleaching Products: A 6-Month Followup

“…In a recent study [12] on Opalescence PF a much lower total Δ E ab * increase of 3.66 was reported in contrast to the 5.2 (Figure 4) found in this study. This difference is most probably due to the color selection of the teeth to be treated.…”

“…Many clinical studies [5, 7–12] on various 10% carbamide peroxide products revealed good tooth whitening results which are claimed to last for years [13, 14]. However, the whitening effect shows some relapse in color after the cessation of active bleaching treatment.…”

Spectrophotometric Evaluation of Color Changes of Bleach-shade Resin-based Composites after Staining and Bleaching

“…CP can remove stains from the composite, but cannot bleach the composite; however, CP can effectively bleach teeth. 37 If we consider that bleached teeth become darker with time, as reported by Grobler et al, 38 there is a 13.7 and 20.2% decrease in the ∆E values 6 and 14 months after bleaching, respectively, and CP effectiveness on tooth color change decreases as the bleaching period decreases, and the tooth color become Lighter. 39 Consequently rebleaching with CP, using a short treatment period, will reestablish the color match between the restoration and the tooth structure, due to its ability to return the tooth color to baseline (or to the color after the first bleach), in addition to stain removal from the resin composite restoration.…”

Evaluation of Genotoxicity and Efficacy of At-home Bleaching in Smokers: A Single-blind Controlled Clinical Trial

“…3 Although the effectiveness of this procedure is well reported in the literature, [4][5][6] the clinical trials on this technique are usually performed on patients with sound teeth and who are nonsmokers. Smoking is usually included as an exclusion criterion in most clinical trials of at-home 4,[7][8][9][10][11][12] and in-office bleaching. 1,13,14 There are at least two reasons for this exclusion.…”