Bleaching effect of violet LED of 405–410 nm on stained endodontically treated teeth

• Published in: Photodiagnosis and photodynamic therapy 2022-09, Vol.39, p.102929-102929, Article 102929
• Main Authors: Teodosio, Leonardo Moreira, Gambarini, Leticia, Faria-e-Silva, André Luis, Pires-de-Souza, Fernanda de Carvalho Panzeri, de Souza-Gabriel, Aline Evangelista, Mazzi-Chaves, Jardel Francisco, Sousa-Neto, Manoel D., Lopes-Olhê, Fabiane Carneiro
• Format: Article
• Language: English
• Subjects: Endodontically treated teeth; Hydrogen peroxide; Tooth bleaching; Violet LED
• ISSN: 1572-1000; 1873-1597
• DOI: 10.1016/j.pdpdt.2022.102929

•For stained endodontically treated teeth violet LED has a lower bleaching effect compared to hydrogen peroxide, whether or not associated with violet LED. To evaluate in vitro the whiteness index (WID) and the whiteness index variation (ΔWID), as well as the color stability of stained endodontically treated teeth after bleaching with violet LED (VL) and with hydrogen peroxide 35% (HP) associated or not to VL. Twenty-four lower incisors were selected. The color was measured using a spectrophotometer at the following times: baseline, after staining, bleaching, and thermocycling, to determine the whiteness index and variation (WID and ΔWID). For the staining process, the teeth were immersed in human blood and centrifuged. After biomechanical preparation, the specimens were distributed into three groups (n = 8): control group (HP); violet LED (VL); and HP 35% + VL (HP+VL), and one session was performed for both bleaching procedures every week for three weeks, followed by thermocycling, where 10,000 cycles were performed. After color analysis, the data obtained were submitted to statistical analysis (RM ANOVA, p