Compromised Bond Strength after Root Dentin Deproteinization Reversed with Ascorbic Acid

Cunha, Leonardo Fernandes da; Furuse, Adilson Yoshio; Mondelli, Rafael Francisco Lia; Mondelli, José

doi:10.1016/j.joen.2009.09.008

Cited by 67 publications

(79 citation statements)

References 30 publications

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“…26 In addition, Da Cunba and others reported that a reducing agent, such as ascorbic acid, is capable of reversing the effect of dentin deproteinization by NaOCl and improving the bond strength of resin to dentin. 27 Turkun and others reported a more than 35% improvement in bond strength of a kind of two-step self-etching adhesive compared to the positive control group subsequent to bleaching and the application of sodium ascorbate. 17 Therefore, the current study was designed to investigate: 1) the fracture resistance of root-filled teeth undergoing combination bleaching; 2) the same resistance when sodium ascorbate is used as an antioxidizing agent.…”

Section: Introductionmentioning

confidence: 98%

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: Introductionmentioning

confidence: 98%

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

Khoroushi

Feiz²,

Khodamoradi³

2010

Operative Dentistry

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“…Irrigation with NaOCl leaves residual oxygen on the substrate, which may interfere with the free-radical polymerization of Unicem at the bonded interface. 19 The same result, however, was not observed for BisCem, most likely due to differences in polymerization kinetics between the SARCs.…”

Section: Discussionmentioning

confidence: 90%

Immediate and delayed photoactivation of self-adhesive resin cements and retention of glass-fiber posts

et al. 2014

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The aim of this study was to evaluate the effect of immediate and delayed photoactivation of self-adhesive resin cements (SARCs) on the retention of glass-fiber posts luted into root canals. Bovine incisors were endodontically treated, and post holes of 9 mm in depth were prepared. Fiber posts were luted using one of two SARCs, BisCem  (Bisco Inc., Schaumburg, USA) or RelyX Unicem clicker (3M ESPE, Saint Paul, USA), or a regular (etch-and-rinse) resin cement (AllCem; FGM, Joinvile, Brazil). Photoactivation was performed immediately, or at 5 or 10 min after cementation. Root/post specimens were transversely sectioned 7 days after luting into 1-mm-thick slices, which were submitted to push-out testing in a mechanical testing machine. Bond strength data were analyzed by two-way ANOVA and Student-Newman-Keuls' method (α = 0.05). Immediate photoactivation resulted in the highest bond strength for Unicem. BisCem  demonstrated higher bond strength values when photoactivated after a 10-min delay. Immediate photoactivation yielded the lowest bond strengths for AllCem, although no differences in bond strength were observed between photoactivation delayed by 5 and 10 min. In conclusion, the moment of resin cement photoactivation may affect the intraradicular retention of fiber posts, depending upon the resin cement used for luting.

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“…Similar to the current study, previous studies also used the push-out test to test the effect of different irrigating solutions on bond strength. 14,26 Chemical solutions promote changes in dentin substrate; therefore, it is possible that these changes differ between solutions. [9][10][11][12]26,27,28 A manufacturer (3M ESPE) recommends the pretreatment of dentin with sodium hypochlorite (NaOCl) at concentrations of 2.5%-5.25% before post cementation.…”

Section: Resultsmentioning

confidence: 99%

Effect of different surface treatments on the push-out bond strength of fiber posts into the root canal

Cintra¹,

Batistella²,

Marson³

et al. 2015

Dental Pres Endod

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The aim of this study was to evaluate the effects of different surface treatments on the bond strength of fiber posts into root canal. Forty-four recently extracted human mandibular premolars were instrumented by K3 TM rotary system. The root canals were filled with gutta-percha and Sealapex TM sealer. Post spaces were prepared, and root canals subjected to one of the following four surface treatments: irrigation with 0.9% sodium chloride (NaCl), 2.5% sodium hypochlorite (NaOCl), 2% chlorhexidine gluconate (CHX), or 17% ethylenediamine tetraacetic acid (EDTA). Fiber posts were cemented with self-adhesive resin cement RelyX TM (Unicem). From the coronal part of each root, three slides with 1 mm in thickness were obtained. A push-out bond-strength test was performed with the aid of a universal testing machine at a crosshead speed of 0.5 mm/min. Data (in MPa) were subject to statistical analysis by two-way ANOVA and post hoc Tukey's test (p < 0.05). Results revealed no significant differences between the different chemical solutions used as surface treatments before the luting procedure. EDTA elicited the highest bond strength. The results also showed that surface treatment with NaOCl or EDTA increased bond strength to dentin, as compared with the control group. The bond strength of fiber posts to root canal dentin was not significantly affected by surface treatment with 2.5% NaOCl, 2% CHX solution, or 17% EDTA.Keywords: Endodontics. Bonding agents. Dentin. How to cite this article: Cintra LTA, Batistella AR, Marson FC, Archangelo CM, Gomes-Filho JE. Effect of different surface treatments on the push-out bond strength of iber posts into the root canal.

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Compromised Bond Strength after Root Dentin Deproteinization Reversed with Ascorbic Acid

Cited by 67 publications

References 30 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

Immediate and delayed photoactivation of self-adhesive resin cements and retention of glass-fiber posts

Effect of different surface treatments on the push-out bond strength of fiber posts into the root canal

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