Matheus Kury1, Erica Eiko Wada1, Samuel da Silva Palandi1, Mayara Zaghi Dal Picolo1, Marcelo Giannini1, Vanessa Cavalli2. 1. Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, 901 Limeira Avenue, Areião, Piracicaba, SP, 13414-903, Brazil. 2. Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, 901 Limeira Avenue, Areião, Piracicaba, SP, 13414-903, Brazil. vcavalli@yahoo.com.
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.
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.
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