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Published in: Lasers in Medical Science 5/2019

01-07-2019 | Original Article

Effect of lights with various wavelengths on bleaching by 30% hydrogen peroxide

Authors: Minh Nguyet Luong, Masayuki Otsuki, Yasushi Shimada, Thwe Zin Ei, Yasunori Sumi, Junji Tagami

Published in: Lasers in Medical Science | Issue 5/2019

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Abstract

The objective of this study was to evaluate the bleaching effect of light sources with various wavelengths using 30% hydrogen peroxide (HP) in vitro. The hematoporphyrin-stained paper was bleached with HP and irradiated for 10 min using LED light sources with 265, 310, 365, 405, or 450 nm respectively. In control group, HP was applied for 10 min without light irradiation. The bleaching procedure was repeated two times. The L*a*b* values of the samples before bleaching and after each bleaching step were measured using a colorimeter. Color changes of specimens were then calculated and statistically analyzed. There was an interaction between light sources and time of irradiation in the color change (p < 0.05). Time and light sources significantly affected ΔE and ΔL (p < 0.05). The light source of 256 nm showed the highest bleaching effect over time followed by that of 310 nm, which were statistically different from other groups (p < 0.001). The 365 nm, 450 nm groups, and control group showed low bleaching effect visually with no significant differences in ΔE and ΔL (p > 0.05). It was concluded that the wavelengths of the light sources affected the bleaching by HP. The 310-nm light can be a potential source for bleaching.
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Metadata
Title
Effect of lights with various wavelengths on bleaching by 30% hydrogen peroxide
Authors
Minh Nguyet Luong
Masayuki Otsuki
Yasushi Shimada
Thwe Zin Ei
Yasunori Sumi
Junji Tagami
Publication date
01-07-2019
Publisher
Springer London
Published in
Lasers in Medical Science / Issue 5/2019
Print ISSN: 0268-8921
Electronic ISSN: 1435-604X
DOI
https://doi.org/10.1007/s10103-018-2670-y

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