Effect of bleaching on subsurface micro-hardness of composite and a polyacid modified composite

Hannig, Christian; Duong, Sebastian; Becker, Klaus; Brunner, Edgar; Kahler, Elke; Attin, Thomas

doi:10.1016/j.dental.2006.01.008

Cited by 95 publications

(126 citation statements)

References 16 publications

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“…9 This may influence the clinical acceptability of composite resin restorations in a long-term evaluation. In a microhardness assessment study, 22 it was suggested that the oxidation promoted by hydrogen peroxide affects more than the subsurface of the restoration, thus compromising not only the restoration surface but also the body of the restoration.…”

mentioning

confidence: 99%

Influence of Hydrogen Peroxide Bleaching Gels on Color, Opacity, and Fluorescence of Composite Resins

Torres¹,

Ribeiro²,

Bresciani

et al. 2012

Operative Dentistry

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Bleaching therapies with 20% or 35% hydrogen peroxide gels influenced composite resin color and fluorescence. No influence on opacity was observed. SUMMARYThe aim of the present study was to evaluate the effect of 20% and 35% hydrogen peroxide bleaching gels on the color, opacity, and fluorescence of composite resins. Seven composite resin brands were tested and 30 specimens, 3-mm in diameter and 2-mm thick, of each material were fabricated, for a total of 210 specimens. The specimens of each tested material were divided into three subgroups (n=10) according to the bleaching therapy tested: 20% hydrogen peroxide gel, 35% hydroxide peroxide gel, and the control group. The baseline color, opacity, and fluorescence were assessed by spectrophotometry. Four 30-minute bleaching gel applications, two hours in total, were performed. The control group did not receive bleaching treatment and was stored in deionized water. Final assessments were performed, and data were analyzed by two-way analysis of variance and Tukey tests (p,0.05). Color changes were significant for different tested bleaching therapies (p,0.0001), with the greatest color change observed for 35% hydrogen peroxide gel. No difference in opacity was detected for all analyzed parameters. Fluorescence changes were influenced by composite resin brand (p,0.0001) and bleaching therapy (p=0.0016) used. No significant differences in fluorescence between different bleaching gel concentrations were detected by Tukey test. The

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mentioning

confidence: 99%

Influence of Hydrogen Peroxide Bleaching Gels on Color, Opacity, and Fluorescence of Composite Resins

Torres¹,

Ribeiro²,

Bresciani

et al. 2012

Operative Dentistry

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“…In contrast to some other studies concerning alterations of composite materials 14,23) , the samples were not stored in human saliva or artificial saliva during or after treatment with NaOCl because the present study aimed to evaluate the influence of the contact of an endodontic rinsing solution on the microhardness of build-up materials. As the use of rubber dam is indicated during root canal treatment to prevent contact of saliva with the root canal or rinsing solution with the oral cavity, no incubation in saliva was chosen to simulate the clinical situation.…”

Section: Discussionmentioning

confidence: 99%

“…Various other studies have also determined alterations of composite restorative materials by measuring changes in microhardness 14,18,19) . Besides measuring changes in the micohardness, other mechanical properties of resin based materials could also be tested, such as: flexural strength 20) , surface roughness 21) and fracture toughness 22) .…”

Section: Discussionmentioning

confidence: 99%

“…Due to the known disadvantages of amalgam as build-up material, (corrosion 12) and discoloration of the remaining tooth structure) or poor mechanical properties of glass ionomers as compared with composites 13) , use of composites as build-up materials should be preferred. There are different studies showing a high propensity of composite materials for alteration after contact with chemical substances such as hydrogen peroxide 14) , organic acids 15) or ethanol 16) . After completion of the endodontic treatment, the pre-endodontic build-ups are often used as a framework for the final build-up for the prosthetic restoration of the tooth.…”

Section: Introductionmentioning

confidence: 99%

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Effect of sodium hypochlorite contamination on microhardness of dental core build-up materials

2010

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This study aimed to determine the influence of sodium hypochlorite (NaOCl) contamination on the microhardness of build-up composites. Fifty-two samples, from each of three build-up materials (LuxaCore Dual, MultiCore flow and Rebilda DC) were prepared. Half of the samples from each material were stored in physiologic saline (baseline control) while the other halves were stored in NaOCl. After 1 h, the samples were rinsed with tap water, cut axially and measured for Knoop hardness at different depth levels. The results were analysed by ANOVA and unpaired t-tests (p<0.05). Significant differences in microhardness were observed for LuxaCore Dual up to 0.2 mm, Rebilda DC up to 0.3 mm, and for MultiCore flow up to 0.4 mm under the surface level. Contact with sodium hypochlorite on build-up materials causes reduction of the microhardness. The softening is not only limited on the surface, but can also be found in deeper layers of build-up materials.

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“…The differences in the composite roughness and MHN values obtained after the same bleaching regime may be related to the different polymers in their organic matrix, and their filler content and particle size. 24,25 There is limited scientific evidence regarding the effect of bleaching solutions on MHN of restorative resins. 3,26,27 Along with oxidizing agent used in the at-home bleaching agents, an additive called carbopol (carboxy polymethylene) may be added to increase the viscosity of gel that in turn improves bonding to the enamel surface and prolongs the liberation of oxygen.…”

Section: Discussionmentioning

confidence: 99%

Effects of Bleaching Agents on the Microhardness and Surface Roughness of Bulk Fill Composites

Francis¹,

Pradeep

Ginjupalli

et al. 2017

World Journal of Dentistry

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Aim:The aim was to compare the effect of 10 and 20% carbamide peroxide (CP) on microhardness (MHN) and surface roughness of two commercially available bulk fill composites (X-tra fill Bulk Fill and Tetric EvoCeram Bulk Fill). Materials and methods:A total of 50 specimens with both type composites were prepared using brass molds of inner diameter 10 mm and a height of 4 mm. Each type of composite was further divided into three groups, control group stored in artificial saliva for 14 days, other groups bleached with 10 and 20% CP respectively, for 14 days. Microhardness of the composite resin was tested with a Vickers hardness tester, whereas surface roughness was tested with profilometer.Results: All the analysis was performed using Statistical Package for the Social Sciences version 18. The value of p < 0.05 was considered statistically significant. Both 10 and 20% CP significantly reduced MHN of experimental composite resins. However, the mean surface roughness was significantly higher in X-tra fill Bulk Fill than Tetric EvoCeram Bulk Fill at 20% CP concentration. The mean MHN of Tetric EvoCeram was reduced when compared with X-tra fill at 20% CP. Conclusion:There was a significant reduction in the MHN of restorative materials observed after exposure to CP under a clinically simulated bleaching regimen. However, increase in surface roughness was seen only at 20% CP. Clinical significance:The physical properties, such as MHN and surface roughness have a crucial effect on the longevity of restorations and, moreover, on the esthetic demands of patients, but they may be compromised by bleaching treatments. The aim of this research paper was to assess the reaction of home bleaching agents on the physical properties of two Bulk Fill composite resin restorative materials.

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Effect of bleaching on subsurface micro-hardness of composite and a polyacid modified composite

Cited by 95 publications

References 16 publications

Influence of Hydrogen Peroxide Bleaching Gels on Color, Opacity, and Fluorescence of Composite Resins

Influence of Hydrogen Peroxide Bleaching Gels on Color, Opacity, and Fluorescence of Composite Resins

Effect of sodium hypochlorite contamination on microhardness of dental core build-up materials

Effects of Bleaching Agents on the Microhardness and Surface Roughness of Bulk Fill Composites

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