Correlation between antioxidant activity and bonding strength on bleached enamel

Abstract

Objective: This study used the 2,2-diphenyl-1-picryl-hydrazyl-hydrate (DPPH) method to evaluate the percentage of antioxidant activity (%AA) of green tea (GT) and sodium ascorbate (SA) gel in three concentrations (10%, 20% and 30%), and the influence of these concentrations on the microshear bond strength (μ-SBT) values of bleached enamel, using 10% carbamide peroxide (CP). Materials and methods: Eighty intact third molars were selected to perform the μ-SBT test, and were randomly divided into eight experimental groups: G1: positive control – no treatment; G2: negative control – bleached with CP; G3: PC +10% GT; G4: PC +20% GT; G5: PC +30% GT; G6: PC +10% SA; G7: PC +20% SA and G8: PC +30% SA. After applying the treatments, adhesive procedures were performed using Single Bond 2 and Filtek Z350XT. After 24 h, the samples were tested in a universal testing machine until fracture. The %AA was assessed in triplicate by DDPH method using a UV–VIS spectrophotometer. Results: In the μ-SBT, ANOVA revealed no significant difference between the antioxidants evaluated (p = .625), but did reveal significant effects of the concentrations studied (p = .007). A negative correlation was observed between μ-SBT and solution concentrations. The values of %AA were from 90.58 to 96.75. Conclusions: The reverse results occurred in μ-SBT values, only when the antioxidants were used in a 10% concentration and, %AA did not influence μ-SBT.

Comparative Evaluation of Two Antioxidants on Reversing the Immediate Bond Strength of Bleached Enamel: In Vitro Study

“…Tooth bleaching is a cosmetic method to change the color of tooth structure through bleaching agent [5,[7][8][9]12,18]. It is advantageous due to its harmlessness to the tooth and surrounding tissues, simple operation, safety, and quick effect.…”

“…Nevertheless, it increases the number of office visits, thus bringing great inconvenience to patients [23]. In recent years, antioxidant treatment has provided us with promising results to reverse the decline of BS-RBE [3][4][5][6][7][8][9][10][11][12]14,19,23,40]. Currently, a variety of antioxidants are used to enhance BS-RBE.…”

“…According to the previous studies, the BS-RBE with antioxidants was significantly higher than that without [12][13][14]. Furthermore, De Carvalho HC et al [12] found the most useful BS-RBE when the concentration of SA was 10%. However, the BS-RBE decreased with the concentration increasing to 20% and 30%.…”

The Effects of Antioxidant Application and Time Factor on Fiber Post Bonding to Root Dentin after Intracoronal Bleaching

“…Therefore, in this study, the SA was evaluated for reversing the negative effects of the bleaching agent. In previous studies, it has been shown that an SA application resulted in higher bonding strengths after nonvital bleaching procedures (9)(10)(11)(12). Besides the use of antioxidants, delayed bonding or cementation procedures have also been studied; however, there is contradictory information in the literature on this subject.…”

“…Int Dent Res 2018;8(1): 22-27. posts have been recommended (8,9). However, the data in the literature is contradictory, and there is no consensus about their effectiveness (10)(11)(12)(13).…”