Clinical Evaluation of the Efficacy of 10% Carbamide Peroxide Bleaching Agent Used During Night-Time and Day-Time

This split-arch clinical study was performed to compare the effects of using 10% carbamide peroxide bleaching agent for one hour twice a day with its use for 8 hours/night on tooth color change, color stability and sensitivity. Method: Bleaching trays, with reservoirs for the six maxillary anterior teeth, were fabricated for 12 volunteers. The trays were cut into two halves between the left and right central incisors (dayside vs. night-side) to be used with 10% carbamide peroxide for two weeks. The day-side tray was applied for one hour twice a day, while the night-side was applied for 8 hours overnight. Objective color measurements, using a colorimeter, were adopted to measure the color of the teeth of the two sides at the baseline appointment and at 1, 2, 3, 6 and 12 weeks. Total color difference (ΔE*) between two color measurements was calculated for all periods. Teeth and soft-tissue sensitivity were self-recorded for both sides during the bleaching weeks and the following week. Both Student's Clinical evaluation of the efficacy of 10% carbamide peroxide... Dr. Manal Hussain Abd-alla Issue No. 38/2016 Journal of Al Rafidain University College 49 ISSN (1681-6870) t-test and Tukey's test were used to compare ΔE* between the two sides and with time at p<0.05. Results: Both sides showed significant differences in ΔE* over time (p<0.05). However, no significant differences were recorded between the two sides at each measuring period (p>0.05). Conclusion: At-home bleaching treatment using 10% carbamide peroxide for one hour twice daily produced similar tooth color change, stability and sensitivity with its use for 8