The influence of time of hydrogen peroxide exposure on the adhesion of composite resin to bleached bovine enamel

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

doi:10.1016/s0099-2399(06)81588-8

Cited by 110 publications

(139 citation statements)

References 7 publications

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“…Initial free radical generation of dimethacrylate monomers is directly related to the irradiance absorbed by the composite. The rate of polymerization of the resin composites is proportional to the square root of the absorbed light intensity and photoinitiator concentration 4,18) . Besides the low light intensity as depth increases, shrinkage stress due to polymerization could lead to weakened bond strength of the cement.…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, chemical irrigants used during root canal preparation may alter the chemical composition of the dentin surface as well as the interaction between the dentin and resinbased sealer. The use of sodium hypochlorite, despite its disinfective properties 19) , could affect penetration of the resin sealer in dentin and its polymerization 11,18) . Furthermore, sodium hypochlorite is a deproteinizing agent that can degenerate dentin by collagen dissolution 9) .…”

Section: Introductionmentioning

confidence: 99%

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Influence of Endodontic Irrigants on Resin Sealer Bond Strength to Radicular Dentin

Rocha

Andrade

Leitune

et al. 2012

Bull. Tokyo Dent. Coll.

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The present study evaluated the influence of 2% chlorhexidine and 2.5% sodium hypochlorite on the resin sealer/dentin interface bond strength of AH Plus/gutta-percha and Epiphany/Resilon. Seventy-two extracted bovine incisors were randomly distributed into 6 groups according to irrigant and sealers: G S+AH =physiologic saline solution+AH Plus/gutta-percha; G S+Ep =physiologic saline solution+Epiphany/Resilon; G H+AH =2.5% sodium hypochlorite (NaOCl)+AH Plus/gutta-percha; G H+Ep =2.5% NaOCl+Epiphany/ Resilon; G C+AH =2% chlorhexidine (CHX)+AH Plus/gutta-percha; and G C+Ep =2% CHX +Epiphany/Resilon. After 7 days at 377C and 100% humidity, the roots were cut transversally on the long axis of the tooth in 0.8 mm (±0.09)-thick slices; these slices were then subjected to the push-out test. Data were analyzed using a 2-way ANOVA and Tukey tests at 5% significance. The AH Plus/gutta-percha groups showed significantly higher bond strength than the Epiphany/Resilon groups, regardless of the irrigant used (p<0.001). Sodium hypochlorite adversely affected bond strength in the AH Plus group, whereas chlorhexidine did not influence the push-out bond strength of either sealer (p<0.05). Two percent chlorhexidine did not adversely affect the bond strength of the sealers, whereas 2.5% sodium hypochlorite solution damaged AH Plus/gutta-percha bond strength.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Endodontic Irrigants on Resin Sealer Bond Strength to Radicular Dentin

Rocha

Andrade

Leitune

et al. 2012

Bull. Tokyo Dent. Coll.

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“…Studies have shown that the bonding strength of enamel decreases after bleaching with CP in various concentrations. 7,[17][18][19][20] The bleaching agents release free radicals as nascent oxygen and hydroxyl or peri-hydroxyl ions when they are applied to the dental structure. A free radical is any molecule that has one unpaired electron, providing it with high reactivity.…”

Section: Discussionmentioning

confidence: 99%

“…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%

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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“…7 Even when teeth are exposed to peroxide for short periods of time, as occurs in office bleaching, a large amount of oxygen is present. 24 This oxygen causes a reduction in bond strength. This is ob- served when an adhesive procedure is performed right after the bleaching treatment, because oxygen inhibits the polymerization of resin monomers.…”

Section: Methodsmentioning

confidence: 99%

Effect of Sodium Ascorbate and Ascorbic Acid Hydrogels on Microleakage of Composite Restorations after an Office Bleaching Protocol

et al. 2014

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Aim: This study evaluated the infl uence of 20% sodium ascorbate (SA) and 10% ascorbic acid (AA) hydrogels on the microleakage of class V composite restorations after an offi ce bleaching protocol (B). Methods: Sixty bovine incisors were sectioned at one point extending 8 mm from the amelodentinal junction toward the incisal edge, and at a second point extending 2 mm from the amelodentinal junction toward the root apex. Root canals were sealed with a composite and the teeth were divided into 5 groups. In Group C (control group), the teeth were prepared (P; 4 × 3 mm depth × diameter; diamond bur 3131, KG Sorensen), etched, rinsed (ER), submitted to an adhesive system protocol (Ambar, FGM), and restored (R) with a microhybrid composite (Opallis, FGM); In Group IR, the teeth were bleached (B; 2 sessions, 1 week interval, 35% hydrogen peroxide, Whitness HP Blue, FGM) + P + ER + R; In Group SA, teeth were B + P + SA (20%/15 minutes) + ER + R; In Group AA, teeth were B + P + AA (10%/15 minutes) + ER + R; and in Group MR, the teeth were B + stored in water (37°C/14 days) + P + ER + R. Specimens were submitted to an aging process by thermocycling (5 × 10 4 cycles of 5°C and 55°C with a dwelling time of 30 s), varnish-sealed, immersed in basic fuchsin (3 h), washed and sectioned with a diamond disc. Microleakage was measured with the aid of ImageTool  software. ANOVA and Tukey's post hoc test (p < 0.05) were applied. Results: Microleakage (mm) and standard deviations per group were as follows: C, 0.29 (0.06) A ; IR, 1.86 (0.15) C ; SA, 1.08 (0.09) B ; AA, 1.07 (0.10) B ; MR, 1.02 (0.12) B . Conclusions: Bleached teeth submitted to superfi cial treatment with 20% SA and 10% AA applied for 15 minutes prior to restoration presented reduced microleakage, as compared to immediately restored bleached teeth. Use of these antioxidants led to a microleakage comparable to that observed after a waiting period of 14 days prior to restoration. Dental Materials; Dental Leakage; Tooth Bleaching.Efeito de hidrogéis de ascorbato de sódio e ácido ascórbico na microinfi ltração de restaurações de resina composta realizadas após aplicação de um protocolo de clareamento em consultório • Objetivo: Este estudo avaliou a infl uência da utilização de hidrogéis de ascorbato de sódio (SA) e ácido ascórbico (AA) na microinfi ltração de restaurações classe V de resina composta realizadas após a aplicação de um protocolo de clareamento em consultório (B). Métodos: Sessenta incisivos bovinos foram seccionados a 8 mm da junção amelodentinária em direção incisal e a 2 mm em direção ao ápice radicular. Os canais radiculares foram selados com um compósito e os dentes foram divididos em 5 grupos: no grupo C (controle), os dentes foram preparados (P; 4 × 3 mm profundidade × diâmetro; ponta diamantada 3131, KG Sorensen), condicionados, lavados (ER), submetidos a um protocolo adesivo (Ambar, FGM) e restaurados (R) com uma resina composta microhíbrida (Opallis, FGM); no grupo IR, os dentes foram clareados (B; 2 sessões, 1 semana de intervalo, peróxido de hidr...

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The influence of time of hydrogen peroxide exposure on the adhesion of composite resin to bleached bovine enamel

Cited by 110 publications

References 7 publications

Influence of Endodontic Irrigants on Resin Sealer Bond Strength to Radicular Dentin

Influence of Endodontic Irrigants on Resin Sealer Bond Strength to Radicular Dentin

Reversal of Compromised Bonding in Bleached Enamel Using Antioxidant Gel

Effect of Sodium Ascorbate and Ascorbic Acid Hydrogels on Microleakage of Composite Restorations after an Office Bleaching Protocol

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