Violet LED associated with high concentration hydrogen peroxide: Effects on bleaching efficacy, pH, and temperature

• Autor(a) principal: Manzoli, Tatiane Miranda [UNESP]
• Data de Publicação: 2022
• Outros Autores: Costa, Joatan Lucas de Sousa Gomes [UNESP], Besegato, João Felipe [UNESP], Gelio, Mariana Bena [UNESP], Galvani, Lucas David [UNESP], Bordini, Ester Alves Ferreira, Kuga, Milton Carlos [UNESP], Dantas, Andréa Abi Rached [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.pdpdt.2022.103133; http://hdl.handle.net/11449/247717
• topic: Color change; Dental bleaching; Hydrogen peroxide; pH, Temperature; Violet LED

Background: This study aimed to evaluate the bleaching efficacy, pH, and temperature of 35% hydrogen peroxide (HP) gel used alone or associated with violet LED. Methods: Sixty bovine crowns were sectioned (5 × 5 × 2mm). After staining with black tea, the specimens were randomized into four groups (n = 10) according to the bleaching protocol: HP35R: 3 × 15 min 35% HP; HP35: 1 × 45 min 35% HP; HP35VR: 3 × 8min 35% HP + Violet LED; HP35V: 1 × 24 min + Violet LED. Two bleaching sessions were performed for all the groups. Color change was evaluated before, 24h after each session, 7 days and 15 days after the last session. The variables ∆E00 [CIEDE2000] and WID were used for color analysis. The pH variation (initial and final) and the temperature of the gel were recorded (n = 5). ANOVA two-way for repeated measures and Bonferroni post-test was used at a significance level of 5%. Results: HP35VR and HP35V the most noticeable color change(p < 0.05). The final values of pH were lower than the initial ones, but with no difference between the groups (p > 0.05). Groups HP35VR and HP35V showed an increase in temperature in relation to HP35R (p < 0.05). Conclusions: Violet LED improved the bleaching efficacy of 35% HP in a time-saving manner without negatively affecting the pH and temperature of 35% HP. The renewal of HP did not influence the outcomes.