Effects of black tea tooth staining previously to 35% hydrogen peroxide bleaching
Braz. j. oral sci
;
22: e238082, Jan.-Dec. 2023. tab
Article
Dans Anglais
| LILACS, BBO
| ID: biblio-1393422
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 bleachingSujets)
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Coloration et marquage
/
Thé
/
Blanchiment dentaire
/
Couleur
/
Émail dentaire
/
Agents de blanchiment
/
Essais de dureté
/
Peroxyde d'hydrogène
Type d'étude:
Essai clinique contrôlé
langue:
Anglais
Texte intégral:
Braz. j. oral sci
Thème du journal:
Dentisterie
Année:
2023
Type:
Article
Pays d'affiliation:
Brésil
/
États-Unis d'Amérique
Institution/Pays d'affiliation:
Oklahoma University Health Sciences Center/US
/
University of Campinas/BR
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