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- Title
Colorimetric evaluation after in-office tooth bleaching with violet LED: 6- and 12-month follow-ups of a randomized clinical trial.
- Authors
Kury, Matheus; Wada, Erica Eiko; da Silva Palandi, Samuel; Picolo, Mayara Zaghi Dal; Giannini, Marcelo; Cavalli, Vanessa
- 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. National Clinical Trials Registry (REBEC): RBR-5t6bd9
- Subjects
TOOTH whitening; CLINICAL trials; LED displays; ONE-way analysis of variance
- Publication
Clinical Oral Investigations, 2022, Vol 26, Issue 1, p837
- ISSN
1432-6981
- Publication type
Article
- DOI
10.1007/s00784-021-04062-9