Effect of a New Bleaching Gel on Tooth Whitening.

The purpose of this study was to compare the whitening efficacy of a novel bleaching agent containing a unique tribarrel hydremide-peroxide gel (KoR) with a traditional bleaching system of hydrogen peroxide or carbamide peroxide (Opalescence). Bovine incisors were mounted into a custom resin, arch-shaped mounting device. Four groups of 10 teeth were created using mounting devices containing five teeth each. The in-office and home bleaching gels of KoR and Opalescence were applied to the teeth alone and in trays to simulate a combination of in-office and home bleaching or home bleaching only. Spectrophotometer readings of L* a* b* were performed at baseline, the end of active bleaching (immediate), and three and six months postbleaching. Immediately postbleaching, the use of Opalescence gel resulted in greater change in DeltaE* and Deltab* (less yellow) for combined and home bleaching techniques compared with KoR. After six months, Opalescence had significantly greater DeltaE* and Deltab* compared with KoR for home bleaching only. There was no significant difference in DeltaL* between Opalescence and KoR at any time period with either technique.