Abstract
The purpose of this study was to evaluate the efficacy of two different 10% carbamide peroxide bleaching products just after treatment and after a 6-month follow-up period. Methods. Two 10% carbamide peroxide products (Opalescence PF and Nite White ACP) were applied nightly for 14 days, according to the manufacturers' instructions. The color of teeth 11 and 21 of thirty-four subjects having A2 or darker teeth were measured with a spectrophotometer (L ∗; a ∗; b ∗) before treatment, just after treatment (14 days) and after 6 months. Results and Conclusions. Both products produced significant whitening of teeth with total color change (ΔE ab ∗) of approximately 5.20 units. There was a significant improvement in all 3 color coordinates (L*, a*, and b ∗) for up to 6 months postbleaching (P < .05). Nite White showed a higher degree of relapse (27%) than Opalescence (18%) over the 6-month period. It is suggested that rebleaching after 6 months is not necessary.
Highlights
The demand for tooth whitening has increased dramatically over the past years with the resulting development of many new whitening products from as many different companies [1,2,3]
A meta-analysis of the clinical trials from 1989 to 1999 on dentist-supervised home bleaching products using 10% carbamide peroxide suggested that only 73% of the bleached population will show a color change of two units or greater, and 50% will require retreatment to maintain this effect for longer than 6 months [16]
This study compared the effectiveness of two 10% carbamide peroxide tray-based home bleaching systems: Opalescence PF 10%, carbamide peroxide, with potassium nitrate and sodium fluoride (Ultradent Products, Inc., South Jordan UT, USA) and Nite White ACP containing 10% carbamide peroxide with potassium nitrate, amorphous calcium phosphate, and fluoride (Discuss Dental, Culver City, CA, USA)
Summary
The demand for tooth whitening has increased dramatically over the past years with the resulting development of many new whitening products from as many different companies [1,2,3]. Many clinical studies [5, 7,8,9,10,11,12] on various 10% carbamide peroxide products revealed good tooth whitening results which are claimed to last for years [13, 14]. Matis et al [15] reported a significant whitening of teeth following at-home bleaching with 10% carbamide peroxide for 14 days. A meta-analysis of the clinical trials from 1989 to 1999 on dentist-supervised home bleaching products using 10% carbamide peroxide suggested that only 73% of the bleached population will show a color change of two units or greater, and 50% will require retreatment to maintain this effect for longer than 6 months [16]
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