Scanning electron microscopy observations on the penetration and structure of resin tags in bleached and unbleached bovine enamel

Titley, K.C.; Torneck, Calvin D.; Smith, Dennis C.; Chernecky, R.; Adibfar, Alexander

doi:10.1016/s0099-2399(06)81611-0

Cited by 137 publications

(167 citation statements)

References 10 publications

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“…This interferes with the resin infiltration into etched enamel or demineralized dentin, inhibiting the polymerization of resin placed immediately after bleaching. 17,[20][21][22][23] Although some methods have been used to reverse decreased bond strength, some studies put great emphasis on neutralizing oxygen by using an antioxidant. In recent decades, ascorbic acid and its sodium salt have been used as antioxidants, with the potential to reduce oxidative compounds, especially free radicals.…”

Section: Introductionmentioning

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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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: 99%

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

Khoroushi

Feiz²,

Khodamoradi³

2010

Operative Dentistry

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“…3 In addition, hydrogen and carbamide peroxide, which are commonly used bleaching agents, affect the bonding of enamel and dentin tissue when restorations are applied directly after bleaching treatment. [4][5][6][7][8][9][10][11] Delays of one day, 4,12 three-to-seven days 5,13 and three weeks 11,14 following the bleaching procedure are recommended to enable the enamel to return to normal conditions, activating normal bond strengths and allowing the reestablishment of esthetics.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5]8,24 According to McGuckin and others, 5 the void areas present at the bonding interface decrease in number in bonds formed at longer time intervals after the cessation of bleaching, indicating a gradual elimination of HP and its byproducts, with an increase in bond strength.…”

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confidence: 99%

Reversal of Compromised Bonding in Bleached Enamel Using Antioxidant Gel

Kaya¹,

Türkün²,

Arici³

2008

Operative Dentistry

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Dental bond strength is significantly reduced when bonding is performed immediately after bleaching treatments. It has also been reported that the application of an antioxidant after bleaching treatment improves the adhesive bond strength of oxidized enamel tissue. The application of an antioxidant in gel form by the patient makes the application process easier and shortens time spent in the clinic. SUMMARYMany studies have shown a considerable reduction in the enamel bond strength of resin composite restorations when the bonding procedure is carried out immediately after bleaching. These studies claim that a certain waiting period is needed prior to performing the restoration in order to attain the original bond strength values. This study determined the most effective time duration for the application of sodium ascorbate prepared in gel form. The labial surfaces of 70 bovine incisors were polished with 600-grit silicon carbide paper on a water-irrigated metallurgical polishing wheel. The specimens were randomly divided into seven groups: 1) bleaching (10% Rembrandt Xtra-Comfort +) immersed in artificial saliva for seven days, 2) bonded immediately after bleaching, 3) bleaching + 10% sodium ascorbate (SA) gel for 10 minutes, 4) bleaching + 10% SA gel for 60 minutes, 5) bleaching + 10% SA gel for 120 minutes, 6) bleaching + 10% SA gel for 240 minutes and 7) bleaching + 10% SA gel for 480 minutes. After preparation, a standardshaped resin composite was applied to all specimens. The teeth were stored in distilled water at 37˚C for 24 hours and a universal testing machine determined their shear bond strength. The data were evaluated using ANOVA and Tukey tests. Antioxidant gel proved to be effective for increasing the shear bond strength of the resin composite to enamel. For maximum effectiveness, antioxidant gel should be applied to enamel for

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“…In this perspective, this property could be deleterious during bonding of the composite resin, as higher levels of peroxide or oxygen may be present in the bonding surface, inhibiting the polymerization and, thus, reducing the bond strength. 11 Hence, delay in bonding by 1-3 weeks following the bleaching procedure is recommended. However this rendered immediate reestablishment of further esthetic procedures impossible.…”

Section: Discussion:-mentioning

confidence: 99%

“…[8][9][10] 10 min application of all the experimental groups has been used in this study based on the research work carried out by Vidya et al and Mageshwaran et al where they showed 10min surface treatment is effective and also clinically feseable especially for patients who have opted for in-office bleaching procedures. 11,12 Although many natural extracts have been identified to have antioxidant property, pomegranate and tomato extracts seem to have shown very high potential as antioxidants and therefore these agents were selected for the study.…”

Section: Discussion:-mentioning

confidence: 99%

Effect of Application of Naturally Occurring Anti-Oxidant Agents on Bonding of Composite Resin to Bleached Enamel- An in-Vitro Study.

HK¹,

Nadig²,

Rashmi³

et al. 2017

IJAR

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Background:With the minimal invasive concepts gaining popularity, vital tooth bleaching is well accepted treatment with predictable outcome. One of the disadvantages of tooth bleaching is decreased bond strength of composite resin to enamel. Antioxidants are used to get back the decreased bond strength. Aim of the study: was to investigate, the effect of immediate application of three anti-oxidant agents on reversal of decreased bond strength of composite resin to bleached enamel & to evaluate and compare the resin enamel interface with and without the use of antioxidants using SEM. Materials and Methods: Labial enamel surfaces of 50 extracted human maxillary central incisors were randomly divided into five groups based on the antioxidant used, Group I (n=10): negative control, Group II (n=10): positive control, Group III (n=10): bleaching followed by 10% sodium ascorbate solution application , Group IV (n=10): bleaching followed by 5% pomegranate seed extract application , Group V (n=10): bleaching followed by 5% tomato seed extract application. Each specimen was tested for shear bond strength. Two specimens from each group were selected for scanning electron microscopic (SEM) observation to assess resin enamel interface. Results: Significantly higher shear bond strength values were observed in Group IV, Group V as compared with the control groups, Group I and II. SEM analysis also proved the above results.

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Scanning electron microscopy observations on the penetration and structure of resin tags in bleached and unbleached bovine enamel

Cited by 137 publications

References 10 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

Reversal of Compromised Bonding in Bleached Enamel Using Antioxidant Gel

Effect of Application of Naturally Occurring Anti-Oxidant Agents on Bonding of Composite Resin to Bleached Enamel- An in-Vitro Study.

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