Effects of black tea tooth staining previously to 35% hydrogen peroxide bleaching
Braz. j. oral sci
; 22: e238082, Jan.-Dec. 2023. tab
Article
en En
| LILACS, BBO
| ID: biblio-1393422
Biblioteca responsable:
BR218.1
ABSTRACT
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 peroxideMethods:
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 bleachingAsunto(s)
Palabras clave
Texto completo:
1
Bases de datos:
LILACS
Asunto principal:
Coloración y Etiquetado
/
Té
/
Blanqueamiento de Dientes
/
Color
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Esmalte Dental
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Blanqueadores
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Pruebas de Dureza
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Peróxido de Hidrógeno
Tipo de estudio:
Clinical_trials
Idioma:
En
Revista:
Braz. j. oral sci
Año:
2023
Tipo del documento:
Article
País de afiliación:
Brasil
/
Estados Unidos