Whitening Effect of Two Toothpaste on Stained Composite Resin

Objectives: The goal of this experiment was to evaluate the whitening effectiveness of two toothpastes on the color of stained resin aesthetic restorations.

Methods: Thirty disks measuring 8.0 mm x 2.0 mm were manufactured of composite resin TPH Spectrum (Dentsply) color B1, stained for 7 days with coffee and divided into three groups according to the specific brushing agent: Group A - distilled water (control group); Group B - whitening toothpaste (Simple White – Colgate-Palmolive) and Group C - dental gel (Close Up Fluor - Unilever). The tooth brushing was simulated three times a day during 28 days performing a total of 9600 cycles. Each brushing session was finished with a distilled water rinse. The disk coloration was evaluated by three scorers with the Vita Scale number only, immediately after the coffee staining, after 14 days and after 28 days. The results were statistically analyzed by Kruskal-Wallis test (p ≤ 0.05).

Results: The score mean ranking was: Initially 45.5, 45.5 and 45.5; 14 days 75.5, 30.5 and 30.5 and 28 days 75.5, 30.5 and 30.5 for Groups A, B and C respectively. There was no significant statistical difference among the initial coloration of Groups A, B and C. After 14 and 28 days, the test showed statistical difference between the group A and the groups B and C. There was no significant statistical difference between the coloration of Groups B and C at these times.

Conclusion: Based on the results of this experiment it can be concluded that tooth brushing for 14 days or more with a whitening paste or a gel would be equally effective on the coffee staining removal.