Objective: The purpose of this study was to measure the initial effectiveness and the shade rebound of two home bleaching agents after 6 months.

Methods: A total of sixty six patients ranging in age from 18 to 65 years were selected and were randomly assigned to one of two experimental groups. Group 1 was treated with 10% carbamide peroxide (Opalescence ®) and Group 2 was treated with a 7.5% hydrogen peroxide (Day White 2 ®). Visual shade was determined by comparing a maxillary central incisor to a value oriented Vita shade guide. Color change was determined in D E values by using a small-area colorimeter (Minolta Chroma Meter II ®). Initial measurements were recorded at baseline and 3 weeks; rebound effect at 7 weeks and 6 months. Means and standard deviations were calculated for visual shade changes and for D E measurements. A Students t-test was used to evaluate significance in color difference measurements between the two treatments at each time interval.

Results:

	D E Group 1	D E Group 2	Shade Change Group 1	Shade Change Group 2
Initial Change Bs – 3w	8.02 (5.52)	11.61 (11.65)	7.67 (2.63)	7.42 (2.02)
Rebound 3w – 7w	11.22 (8.51)	10.53 (8.41)	- 0.34 (1.29)	- 0.72 (1.91)
Rebound 7w – 6m	7.56 (3.39)	11.33 (10.96)	- 1.17 (2.01)	- 0.59 (1.62)

Conclusions: There is no statistically significant difference between bleaching materials at any time interval (p £ 0.05)for both visual and colorimetric assessments. Rebound shade change was noted at 7 week and 6 month recalls, but was not statistically significant.

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