Reaction kinetics of sodium ascorbate and dental bleaching gel

Freire, Andrea; Souza, E. M.; Caldas, Danilo Biazzetto de Menezes; Rosa, Edvaldo Antônio Ribeiro; Bordin, Cynthia França Wolanski; Carvalho, Ricardo Marins de; Vieira, Sérgio

doi:10.1016/j.jdent.2009.07.008

Cited by 54 publications

(56 citation statements)

References 20 publications

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“…[35][36][37] Furthermore, a more recent study has shown that shorter application times of sodium ascorbate, even for five minutes, can neutralize bleaching effects in terms of the chemical processes involved. 38 In the current study, the use of sodium ascorbate significantly increased fracture resistance. Some studies have reported peroxide penetration into dental structures, including penetration into the pulp.…”

Section: 30-31mentioning

confidence: 49%

“…One of the primary and most important effects of this agent is the reduction of oxidation reaction, the omission of oxygen-free radicals from the bonding surface and the prevention of polymerization inhibition. 17,38 Another effect of antioxidant is the release of retained oxygen in deeper tissues of enamel and dentin, which facilitates polymerization and resin penetration into tissues and leads to the formation of a more proper hybrid layer, therefore, facilitating the formation of a strong bond between resin composite and enamel/dentin.…”

Section: 30-31mentioning

confidence: 99%

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Fracture Resistance of Endodontically-treated Teeth: Effect of Combination Bleaching and an Antioxidant

Khoroushi

Feiz²,

Khodamoradi³

2010

Operative Dentistry

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SUMMARYThis in vitro study assessed the fracture resistance of endodontically-treated teeth undergoing combination bleaching with 38% and 9.5% hydrogen peroxide gels as in-office and at-home bleaching techniques, respectively. In addition, the effect of an antioxidizing agent, sodium ascorbate, was investigated.Methods and Materials: Sixty maxillary premolars were endodontically-treated, received a glass ionomer barrier as a mechanical seal and were embedded in acrylic resin up to the cemento-enamel junction. The specimens were divided into four groups (n=15) as follows: G I: no bleaching, access cavity restored with resin composite (negative control); G II: bleached for three weeks daily using 9.5% hydrogen peroxide for two hours and three sessions of in-office bleaching using 38% hydrogen peroxide every seven days, then restored (positive control); G III: bleached similar to G II and restored after one week; G IV: bleached similar to G II, along with the use of an antioxidizing agent for 24 hours, then restored. In each in-office and athome bleaching session, the whitening gels were applied to the buccal surface of the tooth and placed inside the pulp chamber (inside/outside bleaching technique). Finally, the specimens underwent fracture resistance testing; the data were analyzed using ANOVA and Scheffé's test (α α=0.05). M Khoroushi • A Feiz • R Khodamoradi Clinical RelevanceThe fracture resistance of endodontically-treated teeth decreases after combination bleaching. The use of sodium ascorbate as an antioxidizing agent reverses decreased fracture resistance. In addition, it decreases the treatment period and the risk of catastrophic crown fractures.

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Section: 30-31mentioning

confidence: 49%

Section: 30-31mentioning

confidence: 99%

Fracture Resistance of Endodontically-treated Teeth: Effect of Combination Bleaching and an Antioxidant

Khoroushi

Feiz²,

Khodamoradi³

2010

Operative Dentistry

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“…The reaction between SA and oxygen into dentin peaks within 1 min and thereafter the reaction reduces considerably (2). Therefore, in this study, sodium ascorbate at both concentrations was applied with two applications for one minute each (11,24). Additionally, the SA in solution form was chosen to conduct this study.…”

Section: Immediate Bonding To Bleached Dentinmentioning

confidence: 99%

“…Additionally, it was shown that sodium ascorbate concentration should be proportional to the one used for bleaching (11). In other words, when hydrogen peroxide is used at 35%, similar concentration of sodium ascorbate must be employed for effective removal of oxygen from the dental tissue (2,11).…”

Section: Introductionmentioning

confidence: 99%

Bonding Effectiveness of Universal Adhesive to Intracoronal Bleached Dentin Treated with Sodium Ascorbate

et al. 2016

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This study evaluated the effect of restorative protocol with sodium ascorbate on the shear bond strength (SBS) of a universal adhesive to intracoronal bleached dentin. One hundred-and-twenty bovine dentin fragments were randomly divided into 12 groups (n=10), according to the bleaching procedure (unbleached and bleached) and restorative protocol (no treatment, 10% sodium ascorbate -10SA, 35% sodium ascorbate -35SA and two-step etch-and-rinse -ER or one-step self-etch -SE Scotchbond universal adhesive approaches). Four whitening sessions were performed using 35% hydrogen peroxide. The samples from control groups were kept in relative humidity at 37 °C. Immediately after bleaching procedures, the assigned antioxidant solution was applied on dentin and restorative procedures were performed following either the ER or the SE approach. After 24 h, the specimens were subjected to SBS test. Data (MPa) were analyzed by ANOVA and Tukey's test (α=0.05). Lower SBS values were found for bleached specimens (8.54 MPa) compared with those unbleached (12.13 MPa) (p<0.05). The bond strength of the sodium ascorbate-treated groups was higher than those untreated, regardless of the strategy employed (p<0.05). Groups restored without sodium ascorbate showed lower bond strength values for both ER (8.32 MPa) and SE (8.28 MPa) adhesive strategies. The group treated with 10SA submitted to ER approach (10.14 MPa) was similar to untreated groups (p>0.05). It may be concluded that bond strength of composite resin to intracoronal dentin was affected by restorative protocol and reduced by bleaching.

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“…Also, it has been reported that when SA was continuously refreshed and the enamel surface was agitated it can enhance the antioxidant effect on the bleached substrate [8,34]. Freire et al [40] recommended application of 25% SA solution for 5 minutes when the 35% hydrogen peroxide was used for bleached teeth. Perhaps, the different kinetics degradation of bleaching agents type may influence the antioxidant ability of SA.…”

Section: Sodium Ascorbate Versus Bleaching Agent Typementioning

confidence: 99%

O ascorbato de sódio promove a resistência de união após técnicas de clareamento dental?

Nascimento

Guerreiro

Carvalho

et al. 2016

Rev. Odonto Ciênc. (Online)

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Objective: To summarize and discuss the available information concerning the effectiveness of sodium ascorbate in improving bond strength after dental bleaching procedures. Methods: Information of original articles or reviews listed in PubMed database using searching terms: ("sodium ascorbate" OR antioxidant) AND (bleaching OR hydrogen peroxide OR carbamide peroxide), were included in the review. Results: Most of studies revealed that sodium ascorbate could restore the altered redox potential of the oxidized bonding substrate, thus reversing the compromised bonding. However, several protocols of this antioxidant have been used in combination with different peroxide concentrations and exposure time to bleaching agents. Conclusion: Studies should be conducted to establish an appropriate application protocol and to evaluate the effect of sodium ascorbate in other dental properties.

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Reaction kinetics of sodium ascorbate and dental bleaching gel

Cited by 54 publications

References 20 publications

Fracture Resistance of Endodontically-treated Teeth: Effect of Combination Bleaching and an Antioxidant

Fracture Resistance of Endodontically-treated Teeth: Effect of Combination Bleaching and an Antioxidant

Bonding Effectiveness of Universal Adhesive to Intracoronal Bleached Dentin Treated with Sodium Ascorbate

O ascorbato de sódio promove a resistência de união após técnicas de clareamento dental?

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