Effect of a 10% carbamide peroxide on wear resistance of enamel and dentine: In situ study

Faraoni, Juliana Jendiroba; Turssi, Cecília Pedroso; Serra, Mônica Campos

doi:10.1016/j.jdent.2008.12.001

Cited by 23 publications

(22 citation statements)

References 24 publications

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“…As observed in the present investigation, some studies demonstrated that application of 16% CP gel also causes more intense morphological changes on enamel surface and reduction of enamel microhardness compared to lowconcentration CP-gels (10)(11)(12). On the other hand, other studies did not observe significant differences on dental enamel structure between bleached or non-bleached surfaces (21)(22)(23), and also among different concentrations of the CP-gels (23). In these investigations, the enamel surface was bleached in an in situ environment.…”

Section: Discussionsupporting

confidence: 66%

Mineral Loss and Morphological Changes in Dental Enamel Induced by a 16% Carbamide Peroxide Bleaching Gel

et al. 2013

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The aim of this study was to compare the effect of a 16% carbamide peroxide (CP) gel and a 10% CP gel on mineralized enamel content and morphology. Enamel blocks from bovine incisors were subjected to a 14-day treatment (8 h/day) with 10% or 16% CP gels. Knoop microhardness was evaluated before bleaching and at 1, 7 or 14 days after this treatment (50 g/15 s). Mineral content (energy-dispersive x-ray spectroscopy), surface roughness and topography (atomic force microscopy) were evaluated at the 14-day period. Data were analyzed statistically by two-way ANOVA and Tukey's test (α=0.05). Significant microhardness reduction was observed at the 7 th and 14 th days for 10% CP gel, and for all bleaching times for 16% CP gel (p<0.05). At the 14-day period, a significant decrease in Ca and P content, increase on surface roughness (p<0.05) as well as on picks and valleys distance were observed when both bleaching gels were used. These enamel alterations were more intense for 16% CP gel. It was concluded that both CP-based gels promoted loss of mineral structure from enamel, resulting in a rough and porous surface. However, 16% CP gel caused the most intense adverse effects on enamel.

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Section: Discussionsupporting

confidence: 66%

Mineral Loss and Morphological Changes in Dental Enamel Induced by a 16% Carbamide Peroxide Bleaching Gel

et al. 2013

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“…Attin et al 21) stated that in vitro conditions are not useful when evaluating the real effects of dental bleaching. Studies that approximate intra-oral conditions, such as in situ studies, have shown that reductions in enamel microhardness after bleaching are insignificant 11) , and do not affect the wear and microhardness of enamel 22) . These considerations were confirmed by the results of this present study, because a positive effect was noted for HS after dental bleaching when evaluating decalcification, surface alteration and reduction of enamel microhardness.…”

Section: Discussionmentioning

confidence: 99%

Surface effects after a combination of dental bleaching and enamel microabrasion: An <i>in vitro</i> and <i>in situ</i> study

et al. 2016

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This study evaluated the effects of combining enamel microabrasion and dental bleaching on the physical properties of enamel, using in vitro and in situ conditions and evaluating surface roughness, enamel microhardness and scanning electron microscopy images. One hundred sound bovine teeth were sectioned and cut into discs and randomly divided into 10 study groups (n=10). The results were submitted to Analysis of Variance (ANOVA) for repeated measures, followed by the Tukey test, with significance at 5%. Enamel surface roughness was significantly influenced by microabrasion, regardless of being combined with dental bleaching, for both HS (Human Saliva) or AS (Artificial Saliva) condition. Enamel microhardness was significantly decreased in the groups in which enamel microabrasion was performed, regardless its combination with dental bleaching; although storage in HS reestablished the initial enamel microhardness. It was concluded that dental bleaching does not cause major damage to microabraided enamel, and that only human saliva recovered the initial enamel microhardness.

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“…11 Since more than 40% of the population have had at least one of their teeth restored, 8,12-14 many studies have evaluated the effects of bleaching agents on restorative materials. Microhardness has drawn much attention in the literature because it is an important physical characteristic of dental materials.…”

Section: Discussionmentioning

confidence: 99%

Effect of different bleaching strategies on microhardness of a silorane-based composite resin

Bahari

Oskoee

Mohammadi

et al. 2016

J Dent Res Dent Clin Dent Prospects

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Background. Dentists’ awareness of the effects of bleaching agents on the surface and mechanical properties of restorative materials is of utmost importance. Therefore, this in vitro study was undertaken to investigate the effects of different bleaching strategies on the microhardness of a silorane-based composite resin.Methods. Eighty samples of a silorane-based composite resin (measuring 4 mm in diameter and 2 mm in thickness) were prepared within acrylic molds. The samples were polished and randomly assigned to 4 groups (n=20). Group 1 (controls) were stored in distilled water for 2 weeks. The samples in group 2 underwent a bleaching procedure with 15% carbamide peroxide for two weeks two hours daily. The samples in group 3 were bleached with 35% hydrogen peroxide twice 5 days apart for 30 minutes each time. The samples in group 4 underwent a bleaching procedure with light-activated 35% hydrogen peroxide under LED light once for 40 minutes. Then the microhardness of the samples was determined using Vickers method. Data were analyzed with one-way ANOVA and post hoc Tukey tests (P < 0.05).Results. All the bleaching agents significantly decreased microhardness compared to the control group (P < 0.05). In addition, there were significant differences in microhardness between groups 2 and 4 (P = 0.001) and between groups 3 and 4 (P<0.001). However, no significant differences were detected in microhardness between groups 2 and 3 (P > 0.05).Conclusion. Bleaching agents decreased microhardness of silorane-based composite resin restorations, the magnitude of which depending on the bleaching strategy used.

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Effect of a 10% carbamide peroxide on wear resistance of enamel and dentine: In situ study

Cited by 23 publications

References 24 publications

Mineral Loss and Morphological Changes in Dental Enamel Induced by a 16% Carbamide Peroxide Bleaching Gel

Mineral Loss and Morphological Changes in Dental Enamel Induced by a 16% Carbamide Peroxide Bleaching Gel

Surface effects after a combination of dental bleaching and enamel microabrasion: An <i>in vitro</i> and <i>in situ</i> study

Effect of different bleaching strategies on microhardness of a silorane-based composite resin

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