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Evaluation of dental enamel microproperties after bleaching with 35% hydrogen peroxide and different light sources:
Alieny-Cristina-Duarte Ferreira1, Ana-Luzia-Araújo Batista2, José-de Alencar-Fernandes Neto2
1Master's Student of the Graduate Postgraduate Program in Dentistry, State University of Paraiba, R. Baraúnas, 351, Bodocongó, Campina Grande, PB, 58429-500, Brazil.
Background:
To evaluate the tooth enamel surface morphology after the action of 35% hydrogen peroxide with and without LED activation.
Material And Methods:
70 bovine incisors with an enamel surface of 4x4x3 mm were used, prepared for reading superficial microhardness and roughness. Specimens were randomly distributed and divided into 7 experimental groups (n = 10); G1 = artificial saliva; G2 = 35% HP - 2 sessions (3x15´); G3 = Phosphoric Acid + 35% HP - 3 sessions (3x15´); G4 = 35% HP - 2 sessions (3x15´) + blue LED; G5 = 35% HP - 2 sessions (3x15´) + green LED; G6 = 35% HP - 2 sessions (3x20´) + violet LED; G7 = Violet LED - 2 sessions (3x20´). The results were analyzed by the Anova, Wilcoxon, Dunnett and Tukey tests (α = 0.05).
Results:
The G4 group showed a greater change in microhardness. Regarding roughness, the biggest mean difference between groups occurred in G2, G5 and G7. Optical microscopy showed a smooth enamel surface in groups G2, G5 and G7.
Conclusions:
Changes in the enamel surface were observed in relation to microhardness, but without significant changes in roughness, where the LED (green and violet) resulted in a smooth surface. Key words:Tooth whitening, superficial morphology, light, photoradiatio.
