&lt;p&gt;Effect of sodium ascorbate on bond strength and metalloproteinases activity in bleached dentin&lt;/p&gt;

Kara

et al. 2020

BDS

Objective: Vital bleaching is popular treatment option for discolored teeth. But at post-treatment stage, loss of adhesion is highly reported. Literature focused on antioxidant application for the answer of this issue. The aim of this study is comparing effects of six different antioxidants on color stability of bleached teeth. Material and Methods: This study includes total of 84 extracted intact non-carious lower incisors. 35% hydrogen peroxide was applied on the labial surfaces of specimens in accordance with manufacturer's instructions. The bleached teeth were divided into 7 groups. No antioxidants were applied to the control group. For the experimental groups, the following antioxidants were applied for 10 minutes each: 5% proanthocyanidin, 5% sodium ascorbate, 5% lycopene, %5 green tea, %5 white tea and %5 ?-tocopherol. CIE L*, a* and b* values of the teeth were measured by a spectrophotometer. The data were analyzed using IBM SPSS version 23. Results: The differences between the groups were determined with one-way ANOVA. The one-way ANOVA test revealed a statistically significant difference between the groups (p<0.005). Highest color change was observed in lycopene group and the lowest was belongs to green tea group. Conclusions: Proanthocyanidin, white tea and green tea could be good post-bleaching antioxidant alternatives based on their herbal nature.

Section: Discussionmentioning

confidence: 99%

Evaluation the Effect of Different Antioxidants Applied After Bleaching on Teeth Color Stability

Kara

et al. 2020

BDS

European J Oral Sciences

“…SA is biocompatible and hydrosoluble, enabling its widespread use in the food industry and for oral purposes (23). Also, there is evidence showing that SA does not negatively impact the activity of dentin metalloproteinases (24). Nonetheless, SA’s instability in the presence of water and oxygen, along with its yellow appearance (which could lead to staining of bleached enamel), appear as drawbacks of this antioxidant (25).…”

Section: Sodium Ascorbate (Sa)mentioning

confidence: 99%

Use of antioxidants to restore bond strength after tooth bleaching with peroxides

Olmedo

Kury

Resende

et al. 2021

This review compiles the literature on the antioxidants used after tooth bleaching with either low or high‐concentrated carbamide and hydrogen peroxide to recover the bond strength. Antioxidants used in bleached teeth are mainly natural and non‐enzymatic, except for catalase. Commonly, antioxidants are applied to remove any reactive oxygen species (ROS) residues left from bleaching gels, which adversely affect adhesive procedures, such as restorations or orthodontic brackets bonding. Even though sodium ascorbate, the most thoroughly investigated antioxidant, showed the most efficient bond strength recovery at 10% concentration, its performance depends on the type of solution and the application time. Natural extracts, such as proanthocyanidins and green tea, showed satisfactory results in the reversal of bond strength at 5% and 10% concentrations, respectively. Sodium ascorbyl phosphate, α‐tocopherol, and catalase exhibited promising results, but further research is required. The adhesive system type plays an important role in the outcome of enamel bond strength after the antioxidant application. The postponement of either restorations or orthodontic brackets cementation following bleaching procedures seems to be efficiently replaced by antioxidant application prior to bonding procedures. However, the efficacy of using an antioxidant to recover bond strength depends on its type and application time.

“…The most accepted theory to explain the post-bleaching bond strength reduction is the presence of residual oxygen on the enamel surface and within its structure [ 15 ]. This may interfere with the monomer capillarity in the etched enamel, as well as the double bond conversion, compromising the polymer quality and thus the final adhesion [ 15 , 16 , 17 ]. With a 7-day delay, similar bond strength values to the control and non-bleached groups have been achieved [ 6 , 16 , 17 ].…”

Section: Discussionmentioning

confidence: 99%

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

Lopes,

Ribeiro,

Barbosa

et al. 2023

Materials

Self Cite

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.