https://doi.org/10.4081/ltj.2025.409

Laser-enhanced tooth bleaching with Nd:YAG, Er:YAG, and diode lasers: an in vitro study

Vol. 32 No. 1 (2025)
Submitted: 29 September 2024
Accepted: 19 February 2025
Published: 16 May 2025
Tooth bleaching, diode laser, Nd:YAG laser, Er:YAG laser, color change, spectrophotometry
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PDF: 6
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Authors

Mahshid Saffarpour
Department of Operative Dentistry, School of Dentistry, Alborz University of Medical Sciences, Karaj, Iran, Islamic Republic of.
Noushin Imeni
Research Committee, Alborz University of Medical Sciences, Karaj, Iran, Islamic Republic of.
Luca Solimei
Department of Surgical Sciences and Integrated Diagnostics, University of Genoa, Italy.
Stefano Benedicenti
Department of Surgical Sciences and Integrated Diagnostics, University of Genoa, Italy.
Nasim Chiniforush
nasimch2002@yahoo.com
https://orcid.org/0000-0002-3490-170X
Department of Surgical Sciences and Integrated Diagnostics, University of Genoa, Italy.

Tooth discoloration and staining are aesthetic issues that trouble many patients. The purpose of this study is to compare tooth color change after bleaching with Nd:YAG, Er:YAG, and diode lasers. Forty-eight upper and lower human anterior teeth and premolars were divided into four groups (12 teeth each). Bleaching gel with 38% hydrogen peroxide was placed on the teeth in all four groups. In the first, second, and third groups, Nd:YAG laser, Er:YAG laser, and diode laser were irradiated after applying the bleaching gel. In the fourth group, which is considered as control group, no laser rays were irradiated for activation after the bleaching gel was placed. Before and after bleaching, the shade of the teeth was measured using the CIELab system by a spectrophotometer (SpectroShade, MHT, Verona, Italy). The results were analyzed using one-way ANOVA and Tukey’s multiple comparison test. All bleaching methods resulted in significant changes in tooth shade (ΔE≥3.3). The average color changes between groups differed significantly (p<0.05). Diode laser caused the highest (ΔE=10.16), and Er:YAG laser caused the lowest amount of color change among all groups (ΔE=5.14). There was no difference between the Nd:YAG and Er:YAG lasers (p>0.05). The color change in the diode laser group was significantly higher than in the control group, whereas it was lower in the Er:YAG and Nd:YAG groups.

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Nasim Chiniforush, Department of Surgical Sciences and Integrated Diagnostics, University of Genoa

Dentofacial Deformities Research Center, Research Institute for Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran

How to Cite

Saffarpour, M., Imeni, N., Solimei, L., Benedicenti, S., & Chiniforush, N. (2025). Laser-enhanced tooth bleaching with Nd:YAG, Er:YAG, and diode lasers: an <i>in vitro</i> study. Laser Therapy, 32(1). https://doi.org/10.4081/ltj.2025.409
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