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Colorimetric evaluation after in-office tooth bleaching with violet LED: 6- and 12-month follow-ups of a randomized clinical trial

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Abstract

Objectives

To evaluate the long-term outcomes of in-office bleaching with violet LED light (LED) alone or combined with carbamide (CP) or hydrogen (HP) peroxides.

Methods

Volunteers of a previous short-term study were recalled for 6- and 12-month follow-ups, according to the following interventions (n = 18/group): LED, CP, LED/CP, HP, and LED/HP. The objective color (ΔEab, ΔE00) and whiteness index (ΔWID) changes were calculated applying the CIELab coordinates’ values obtained using a spectrophotometer. A visual shade guide determined the tooth’s subjective color change (ΔSGU). Data were submitted to one-way ANOVA or Welch’s ANOVA, following appropriate post hoc tests (α = 5%).

Results

The LED and CP groups exhibited the lowest ΔEab, ΔE00, and ΔSGU (p < 0.05), but the LED group displayed a significantly lower ΔWID. After 12 months, the LED/CP group presented a higher ΔEab and ΔE00 than the CP group (p < 0.05). ΔEab, ΔE00, ΔSGU, or ΔWID means did not differ statistically between the LED/CP and HP groups. The LED/HP group presented a higher ΔE00 than the HP group, regardless of the time.

Conclusions

The bleaching efficacy of LED alone was significantly lower compared to the LED/CP and HP-containing protocols. After 12 months, the LED/CP and HP groups did not differ in bleaching efficacy. LED irradiation only increased the objective color change of bleaching gels.

Clinical relevance

LED alone promoted a long-term perceptible bleaching, but not compatible with that of high-concentrated HP. The bleaching outcomes of violet irradiation to 37% CP were maintained over time, with LED/CP demonstrating comparable results to HP even after 12 months.

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Funding

This research was supported by the São Paulo State Research Foundation (FAPESP – #2017/08625–0, #2017/23841–1 and #2017/24847–3). This study was financed in part by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001.

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Authors and Affiliations

  1. Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, 901 Limeira Avenue, Areião, Piracicaba, SP, 13414-903, Brazil

    Matheus Kury, Erica Eiko Wada, Samuel da Silva Palandi, Mayara Zaghi Dal Picolo, Marcelo Giannini & Vanessa Cavalli

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  1. Matheus Kury
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  2. Erica Eiko Wada
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  3. Samuel da Silva Palandi
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  4. Mayara Zaghi Dal Picolo
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Corresponding author

Correspondence to Vanessa Cavalli.

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Ethics approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (Piracicaba Dental School Ethical Committee—2.294.061 and 3.776.209) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Consent to participate

Informed consent was obtained from all individual participants included in the study.

Conflict of interest

M. Kury has received research grant (FAPESP #17–08625-0). E. E. Wada has received research grant (FAPESP #17–24847-3). V. Cavalli has received research grant (FAPESP #17–23841-1).

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Kury, M., Wada, E.E., da Silva Palandi, S. et al. Colorimetric evaluation after in-office tooth bleaching with violet LED: 6- and 12-month follow-ups of a randomized clinical trial. Clin Oral Invest 26, 837–847 (2022). https://doi.org/10.1007/s00784-021-04062-9

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  • DOI: https://doi.org/10.1007/s00784-021-04062-9

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