Effects of Laser-Assisted and Led-Assisted Bleaching Techniques on Color Parameters Publisher



F Sadeghi Mahounak FARZANEH ; N Chiniforush NASIM ; E Anagnostaki EUGENIA ; Ab Jamkhaneh Abolfazl BAZARI ; Z Moradi ZOHREH
Source: Journal of Research in Dental and Maxillofacial Sciences Published:2025

Abstract

Background and Aim: This study assessed the effects of laser-assisted and light emitting diode (LED)-assisted bleaching on color parameters. Materials and Methods: This in vitro study evaluated 40 sound central incisors and premolars immersed in tea solution for 6 days. They were then randomly divided into 4 groups: (I) Bleaching with White Smile containing 40% hydrogen peroxide gel + LED irradiation (Monitex; 4 blue lights with 420-490 nm wavelength and 1 red light with 620-630 nm wavelength), (II) Opalescence Boost containing 40% hydrogen peroxide gel without activation, (III) Opalescence Boost activated by LED, and (IV) Opalescence Boost activated by 980 nm diode laser with 2 W/cm2 power. The color parameters of the teeth were measured at baseline, after staining, immediately after bleaching, and 1 week after bleaching. Color change (∆E) was calculated and analyzed by one-way ANOVA and Tukey’s test (alpha=0.05). Results: Discoloration was significantly resolved in all groups with significant ∆E values (P<0.05). All modalities had a comparable performance regarding the changes in value in the middle and coronal thirds, and caused tooth shade lightening. Opalescence Boost was superior to laser-assisted Opalescence Boost in the incisal third. The changes in a* and b* parameters were not significant and were within the range of lower chroma. Conclusion: The results showed that laser-assisted bleaching with Opalescence Boost had the poorest performance regarding changes in L* parameter. The performance of the conventional Opalescence Boost, LED-assisted Opalescence Boost, and LED-assisted White Smile was the same regarding ∆L, ∆a, and ∆b. © 2025 Elsevier B.V., All rights reserved.