Objective: The home bleaching technique has been applied as a safe and effective bleaching procedures, though it takes a long time to get a good effect. Many manufactures are now marketing home tooth bleaching products. The purpose of this study was to compare a new bleaching product, PolanightTM (SDI Ltd, Australia) with a wildly used home bleaching product, OpalescenceTM (Ultradent, USA). Methods: Fifty-eight healthy Japanese volunteers (18~47 years of age) were selected. Using a simultaneous split mouth protocol, a professionally made custom tray was applied to maxillary right anterior teeth with Polanight and left anterior teeth with Opalescence, respectively. After four weeks (two weeks bleaching and two weeks after treatment), digital imaging was taken at the left and right maxillary canaine teeth using a portable chroma meter (Shade Eye Ex, Shofu, Japan). L*a*b* tooth color changes were analyzed using CIE LAB units. Statistical analysis was performed using Student's T-test. Results: L*a*b* tooth color changes were ‡™L* 4.00±4.05 (means ± S.D., n=58), ‡™a* -1.28±1.20 and ‡™b* -7.53±3.42 for Polanight and ‡™L* 2.54±3.19, ‡™a* -0.99±0.99 and ‡™b* -5.56±3.32, for Opalescence, respectively. And ‡™E values were 9.23±4.30 and 7.78±5.58 for Polanight and Opalescence, respectively. Both agents indicated significant bleaching effects by the treatment. The new product, Polanight, showed significant effect in ‡™L*(p<0.05) and ‡™b*(p<0.005), however a* value did not show remarkable differences between them. Conclusion: Both Polanight and Opalescence were effective in the home bleaching. And Polanight was more effective than Opalesence. Polanight was a good in taste and less hyper-sensitivity for the patients. (This research was supported by SDI Ltd.)

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