Randomized clinical trial comparing the violet light emitting diode system and other tooth whitening techniques

Aim: to evaluate, through a clinical trial, the effectiveness and sensitivity of tooth whitening techniques using violet light emitting diodes (LED), comparing with other whitening techniques.

Methodology: 75 patients were selected to undergo tooth whitening, randomly distributed into five different treatment groups: G1 (35% hydrogen peroxide), G2 (35% hydrogen peroxide + Green LED), G3 (35% hydrogen peroxide at 35% + Blue LED), G4 (35% hydrogen peroxide + Violet LED) and G5 (Violet LED). Sensitivity measurement was recorded using the Visual Analogue Scale (VAS) from 0 to 10; tooth color measurement was performed before (T0) and after 30 days of whitening treatment (T1) using Easyshade Advance 4.0 Vita-Wilcos® dental spectrophotometer. Statistical analysis was performed using the Fisher and Kruskal-Wallis exact test at significance level of p < 0.05.

Results: the enamel whitening effect was observed in all groups, with significant changes in G1. With regard to sensitivity, no statistically significant differences were found between groups.

Conclusion: In G5, no participant reported post-whitening sensitivity, suggesting that treatment with violet LED showed the best sensitivity outcomes, changing the enamel color one more tone on the color scale.