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

Author(s)

Kury, Matheus ^[1] ; Wada, Erica Eiko ^[1] ; Palandi, Samuel da Silva ^[1] ; Dal Picolo, Mayara Zaghi ^[1] ; Giannini, Marcelo ^[1] ; Cavalli, Vanessa ^[1]

Affiliation

^[1] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Restorat Dent, 901 Limeira Ave, BR-13414903 Piracicaba, SP - Brazil

• Document type: Journal article
• Source: CLINICAL ORAL INVESTIGATIONS; v. 26, n. 1 JUL 2021.
• Web of Science Citations: 2

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 (Delta E-ab, Delta E-00) and whiteness index (Delta WID) changes were calculated applying the CIELab coordinates' values obtained using a spectrophotometer. A visual shade guide determined the tooth's subjective color change (Delta SGU). Data were submitted to one-way ANOVA or Welch's ANOVA, following appropriate post hoc tests (alpha = 5%). Results The LED and CP groups exhibited the lowest Delta E-ab, Delta E-00, and Delta SGU (p < 0.05), but the LED group displayed a significantly lower Delta WID. After 12 months, the LED/CP group presented a higher Delta E-ab and Delta E-00 than the CP group (p < 0.05). Delta E-ab, Delta E-00, Delta SGU, or Delta WID means did not differ statistically between the LED/CP and HP groups. The LED/HP group presented a higher Delta E-00 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. National Clinical Trials Registry (REBEC) RBR-5t6bd9 (AU)

• FAPESP's process: 17/08625-0 - In vitro purple led and argon plasma analysis on the color alteration, mineral content, morphology and safety of dental bleaching
• Grantee: Matheus Kury Rodrigues
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 17/24847-3 - In vivo purple led analysis on the color alteration, tooth sensitivity and mineral content of dental bleaching
• Grantee: Erica Eiko Wada
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 17/23841-1 - In vitro/in vivo led Violeta and in vitro argon plasma analysis on color alteration, mineral content, morphology and safety of teeth bleaching
• Grantee: Vanessa Cavalli Gobbo
• Support Opportunities: Regular Research Grants