The Use of Atomic Force Microscopy in Determining the Stiffness and Adhesion Force of Human Dentin After Exposure to Bleaching Agents

Forner, Leopoldo; Salmerón‐Sánchez, Manuel; Palomares, María; Llena, Carmen; Amengual, José

doi:10.1016/j.joen.2009.06.023

Cited by 18 publications

(17 citation statements)

References 21 publications

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“…13,25,30 Moreover, although some authors 20 reported that hybrid layer depth is not usually related to bond strength, higher bond strength values were also verified in this experimental group.…”

Section: Discussionsupporting

confidence: 48%

“…12 In recent studies, microleakage, a decrease in bonding strength, and low micromechanical interaction were associated with bleaching procedures. 6,29,30 These conditions were augmented when the in-office bleaching technique, which uses bleach at a higher concentration, was performed. 31,32 As a result, a 24-hour to one-month waiting period after bleaching has been recommended before performing restorative procedures.…”

Section: Discussionmentioning

confidence: 99%

“…This result may be related to mechanical modifications in peritubular and intertubular dentin produced by bleaching agents that could lead to biomechanical alterations, but there is no evidence to substantiate this. 30,37 Histochemical studies have shown reduced levels of sulfur in samples bleached with HP or CP. Sulfur is a component of proteoglycans (chondroitin sulfate and keratan sulfate), and changes in their levels indicate damage to the organic dentin matrix.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Sodium Ascorbate on Dentin Bonding After Two Bleaching Techniques

Briso

Rahal

Sundfeld

et al. 2014

Operative Dentistry

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Bleaching with either 10% carbamide peroxide or 35% hydrogen peroxide impairs the formation of the hybrid layer, resin tags, and bond strength. The use of sodium ascorbate following bleaching diminishes this adverse effect in the case of 10% carbamide peroxide but not so when 35% hydrogen peroxide is used as the bleaching agent. SUMMARYThe purpose of this study was to analyze the influence of 10% sodium ascorbate (SA) on the hybrid layer, resin tag length, and bond strength to dentin after bleaching. Six groups were tested: G C, control; G SA, sodium ascorbate (SA) + restoration; G CP, bleaching with carbamide peroxide (CP) + restoration; G CP+SA, bleaching with CP + SA+ restoration; G HP, bleaching with 35% hydrogen peroxide (HP) + restoration; and G HP+SA, HP + SA + restoration. After dental bleaching, the dentin was exposed and the antioxidant solution was applied to groups G SA, G CP+SA, and G HP+SA, before bonding procedures. The teeth were sectioned in the mesiodistal direction. One section was decalcified, and the specimens were embedded in paraffin and sectioned in the longitudinal direction with a thickness of 6 lm. Fifteen slices of each specimen were selected according to a systematic sample of slices with an interval proportional to the total number of slices obtained for each tooth. The specimens were stained using the Brown & Brenn method, and an optic microscope was used to analyze the hybrid layer thickness and resin tag length. The remaining tooth segment was sectioned into stick-shaped specimens and used for microtensile bond strength testing (0.5 mm/min). Statistical analysis was performed using two-way analysis of variance and Fisher test. The results for hybrid layer +

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Section: Discussionsupporting

confidence: 48%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Effect of Sodium Ascorbate on Dentin Bonding After Two Bleaching Techniques

Briso

Rahal

Sundfeld

et al. 2014

Operative Dentistry

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“…5 Although HP is a potent and effective whitening agent, there is controversy regarding its safety and possible adverse effects. 6,7 In this regard, HP has been associated to morphological changes, as well as to variations in microhardness, and in the mineral component of enamel and dentin, [8][9][10][11][12] also changes in the dentin-enamel junction 13 and in the elasticity and mechanical properties of dentin, 14 as well as to alterations of their organic components. 15,16 However, there are also many authors…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrogen and Carbamide Peroxide in Bleaching, Enamel Morphology, and Mineral Composition: In vitro Study

Llena

Esteve

Forner

2017

The Journal of Contemporary Dental Practice

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Aim:The aim of the study was to evaluate the bleaching effect, morphological changes, and variations in calcium (Ca) and phosphate (P) in the enamel with hydrogen peroxide (HP) and carbamide peroxide (CP) after the use of different application regimens. Materials and methods:Four groups of five teeth were randomly assigned, according to the treatment protocol: HP 37.5% applied for 30 or 60 minutes (HP30, HP60), CP 16% applied for 14 or 28 hours (CP14, CP28). Changes in dental color were evaluated, according to the following formula:. Enamel morphology and Ca and P compositions were evaluated by confocal laser scanning microscope and environmental scanning electron microscopy.Results: ΔE HP30 was significantly greater than CP14 (10.37 ± 2.65/8.56 ± 1.40), but not between HP60 and CP28. HP60 shows greater morphological changes than HP30. No morphological changes were observed in the groups treated with CP. The reduction in Ca and P was significantly greater in HP60 than in CP28 (p < 0.05). Conclusion:Both formulations improved tooth color; HP produced morphological changes and Ca and P a gradual decrease, while CP produced no morphological changes, and the decrease in mineral component was smaller.Clinical significance: CP 16% applied during 2 weeks could be equally effective and safer for tooth whitening than to administer two treatment sessions with HP 37.5%.

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“…The different properties and behavior of dentin depending on location were noted previously (21)(22)(23). In addition, no data are available that assess the impact of root canal treatment on the nanomechnical properties of dentin.…”

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confidence: 98%