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. 2023 Sep 21;16(18):6328.
doi: 10.3390/ma16186328.

Does the Elapsed Time from Bleaching and the Use of Sodium Ascorbate Influence the Bond Strength of Resin Cement to Bleached Enamel?

Ana Lílian Correia Lopes  1 , Mara Eliane Soares Ribeiro  1 , Jorge Henrique Pinheiro Barbosa  1 , Max Pinto da Costa da Rocha  1 , Mário Honorato da Silva E Souza Júnior  1 , Sandro Cordeiro Loretto  1
Affiliations

Does the Elapsed Time from Bleaching and the Use of Sodium Ascorbate Influence the Bond Strength of Resin Cement to Bleached Enamel?

Ana Lílian Correia Lopes et al. Materials (Basel). .

Abstract

The objective of this study was to evaluate different delaying times after bleaching and the use of different sodium ascorbate (SA) concentrations (10% and 35%) in the bond strength of adhesive cementation to enamel. This study used 54 sound bovine incisors, which were randomly assigned to the following groups: G1 (unbleached/control+ adhesive cementation (AC)); G2 (bleached + AC after 7 days); G3 (bleached + 10% SA + AC after 24 h); G4 (bleached + 10% SA + AC after 7 days); G5 (bleached + 35% SA + AC after 24 h); and G6 (bleached + 35% SA + AC after 7 days). After bleaching, G3, G4, G5, and G6 received an application of SA before the cylinders build up with RelyX Veneer cement. The samples were subjected to microshear test, and the results were analyzed by two-way ANOVA with Tukey's post hoc test. Group one presented the highest mean bond strength (19.1 MPa) and G3 the lowest (16.96 MPa). There was no statistical difference between the groups tested (p ˃ 0.05). The fracture pattern observed was predominantly mixed. The adhesive cementation may be performed 24 h after bleaching when SA (10% or 35%) is used or after 7 days, without compromising bond strength.

Keywords: antioxidant; microshear; resin cement; tooth bleaching.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Scanning electron microscopy images (500× magnification). Adhesive type fracture (A), mixed type fracture (B), and cohesive cement fracture (C).
See this image and copyright information in PMC

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