Effects of black tea tooth staining previously to 35% hydrogen peroxide bleaching

Autor(es)

Samuel da Silva Palandi ^[1] ; Matheus Kury ^[2] ; Mayara Zaghi Dal Picolo ^[3] ; Fernando Luís Esteban Florez ^[4] ; Vanessa Cavalli ^[5]

Afiliação do(s) autor(es)

^[1] University of Campinas. Piracicaba Dental School. Department of Restorative Dentistry

^[2] University of Campinas. Piracicaba Dental School. Department of Restorative Dentistry

^[3] University of Campinas. Piracicaba Dental School. Department of Restorative Dentistry

^[4] Oklahoma University. Health Sciences Center. College of Dentistry

^[5] University of Campinas. Piracicaba Dental School. Department of Restorative Dentistry

• Tipo de documento: Artigo Científico
• Fonte: Braz. J. Oral Sci.; v. 22, 2022-10-17.

Resumo

Aim To determine if the artificial staining with black tea (BT) influences the enamel microhardness before in-office bleaching and if BT staining is necessary to evaluate the efficacy of bleaching with 35% hydrogen peroxide Methods Enamel/dentin blocks were randomized into groups according to the staining protocol (n=5/group): (CO) control – maintained in artificial saliva solution (AS); (BT4) immersed in black tea solution for 4 h; (BT24) immersed in black tea solution for 24 h. After the staining protocols, all specimens were kept in AS for one week, followed by bleaching (three sessions of HP application for 40 min). Knoop surface microhardness (kgF/mm2) was determined at baseline (T0), after staining (T1), after 7 days of storage in AS (T2), and after bleaching (T3). The color (∆E00) and coordinate changes (∆L, ∆a, ∆b) were measured using a digital spectrophotometer at T0 and T3. Data were submitted to one-way (∆E00, ∆L, ∆a, ∆b) or two-way ANOVA repeated measures (kgF/mm2) and Tukey’s test (a=5%). Results The staining protocols (BT4 and BT24) promoted significantly lower microhardness (T1 and T2, p<0.05) than CO, whereas CO was the only group to maintain microhardness values over time. Bleaching promoted perceptible ∆E00 without a significant difference among the groups regardless of the staining protocol (p=0.122). CO and BT4 showed no differences in terms of ∆L and ∆a (p>0.05), but BT4 displayed a higher ∆b than CO. Conclusion The artificial staining with BT negatively affected the enamel surface microhardness and was not essential to evaluate the efficacy of 35% hydrogen peroxide bleaching. (AU)

• Processo FAPESP: 20/08440-3 - Determinação da concentração de nanopartículas experimentais de dióxido de titânio co-dopadas com fluoreto e nitrogênio em gel clareador de peróxido de hidrogênio a 35%
• Beneficiário: Samuel da Silva Palandi
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 20/06782-4 - Desenvolvimento de agentes clareadores experimentais com características bioativas: análise das propriedades físicas do esmalte clareado e biocompatibilidade celular
• Beneficiário: Vanessa Cavalli Gobbo
• Modalidade de apoio: Auxílio à Pesquisa - Regular