The effects of finishing and polishing techniques on surface roughness and color stability of nanocomposites

Gönülol, Nihan; Yılmaz, Fikret

doi:10.1016/j.jdent.2012.07.005

Cited by 174 publications

(174 citation statements)

References 40 publications

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“…In contrast with this hypothesis, Garoushi et al [39] tested the influence of polishing resin composite materials with similar chemical base as the ones we tested (except for silorane), clearly showing no difference between the polished and unpolished samples. Anyway, and even if literature is not univocal concerning the influence of polishing on staining [39][40][41], we prefer to consider the obtained results as clinically relevant only for the above-mentioned clinical situation. A further study with the same protocol and materials and methods but polished samples will be carried out to elucidate definitively this topic.…”

Section: Discussionmentioning

confidence: 99%

Color stability of recent composite resins

et al. 2016

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The objective of the study was to evaluate the color stability of 8 recently developed resin composites when exposed to various staining agents. Six disc-shaped specimens made out of 8 resin composite materials were immersed in artificial saliva, coffee, coke, tea, orange juice and red wine. The initial color (T0) of the 288 specimens was assessed by a calibrated reflectance spectrophotometer (SpectroShade, MHT) over a black as well as a white background. All specimens were kept in an incubator (INP-500, Memmert GmbH) at 37°C for 4 weeks. Colorant solutions were changed every 7 days to avoid bacteria or yeast contamination. After 4 weeks of storage in the colorants (T1), spectrophotometric measurements were repeated and DE00 was calculated. When analyzed over a white background, the mean DE00 values varied from 1.5 (Venus Diamond) to 52.4 (Miris 2). When analyzed over a black background, the mean DE00 values varied from 0.8 (Venus Diamond) to 40.0 (ELS). Significant differences were detected when comparing values at T0 and T1 (DE00) for both backgrounds (Anova and Fisher's LSD post hoc test). Resin composite materials do behave in a significantly different way (p value \ 0.01) when exposed to various staining solutions.

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Section: Discussionmentioning

confidence: 99%

Color stability of recent composite resins

et al. 2016

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“…Al-Nadedh et al 19 reported that bleaching with 10% CP for four hours daily for 2 weeks was superior to both polishing and 38% hydrogen peroxide-based in-office bleaching procedures for stain removal and can effectively remove stains from all tested materials and return them to a clinically acceptable color. Villalta et al 20 studied the effect of different concentrations of CP (16,18 and 35%) on stain removal from resin composites. The results of their study showed how effective the bleaching agents were in removing the exterior staining of dental resin composites and virtually reversed the composite color to baseline (∆E ≤ 3.3).…”

Section: Discussionmentioning

confidence: 99%

“…The authors concluded that polished surfaces, low water sorption, a high filler-resin ratio, reduced particle size and hardness, and an optimal fillermatrix coupling system helped to improve the composite resistance to discoloration. Gönülol 16 Studies have also investigated the effect of bleaching agents on the color, surface roughness and topography of resin composites. Regarding the influence of various bleaching agents on the color of composite resins, Monaghan et al 21,22 found no significant differences in the composite color after exposure to 10% CP, while exposure to 30% HP with infrared light produced significant color changes in some composite resin restorative materials.…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric Evaluation of Color Changes of Bleach-shade Resin-based Composites after Staining and Bleaching

Farah¹,

Elwi²

2014

The Journal of Contemporary Dental Practice

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Spectrophotometric evaluation of color changes of Bleachshade resin-based composites after staining and bleaching.Aim: The aim of this study was to evaluate the color stability of two commercially available bleach-shade resin composites (RC) after exposure to 3 storage solutions and the effect of 3 bleaching agents on the color stability and stain removal from stained RC. Materials and methods:Two bleach-shade RC were evaluated in this study, including a nanofilled RC, Filtek TM Z350 XT (FZ), and a nanohybrid RC, Tetric ® N-Ceram (TC), in the extra-white body (shade) (XWB) and L shades, respectively. Twenty-seven disk-shaped specimens, each measuring 12 mm in diameter and 2 mm in thickness, were prepared for each RC, with a total of 54 specimens. Specimens were randomly allocated into 3 groups of 9 specimens each and immersed in 3 storage solutions (distilled water, tea and coffee) for 7 days period. The 9 specimens in each staining group were further divided into 3 subgroups. Specimens in each subgroup (n = 3) were bleached using one of the bleaching agents (10 and 16% Zoom NiteWhite amorphous calcium phosphate (ACP), and Zoom 2 chairside with light activation) for 5 days period. The specimen colors were measured with spectrophotometer. The measurements were performed on each sample three times at baseline, after staining, and after bleaching. Color was expressed using the commission international de I'Eclairage (CIE) L*a*b* color space. The color differences (∆E) between the three measurements were calculated and the results were statistically analyzed using Two-way and Three-way analysis of variance (ANOVA) and Tukey's posthoc tests. Level of significance was set at p < 0.05. Results: Tetric® N-ceram materials demonstrated significantly less color change than the FZ and the color change, which was greater after storage in coffee compared to tea, was statistically significant. The bleaching agents significantly influence the color changes of composite specimens. All groups showed (∆E) values below 3.3 after bleaching, except for 'Zoom 2 chairside' with light activation groups, which is shown clinically unacceptable lighter shade (ΔE >3.3). Conclusion: Bleach-shade composites showed significant discoloration (ΔE > 3.3) after being immersed into coffee and tea solutions. Nanofilled composites discolored more than nanohybrid composites, and carbamide peroxide-based bleaching agents were effective in reducing the discoloration to a clinically acceptable value (∆E > 3.3). ORIGINAL RESEARCHClinical significance: In this study, after clinically significant discoloration, low concentrations of carbamide peroxide bleaching agents were effective in removing stains and restoring the color of bleach-shade composites to near baseline color.

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“…In several in vitro studies, multi-step aluminum-oxide discs exhibited the smoothest surfaces [13][14][15][16] ; however, due to their geometry, the anatomically contoured surfaces of composite restorations are difficult to polish 12) . In contrast, oneand two-step polishing systems that use elastomeric or rubberized polishers in various shapes, sizes and dimensions come into direct contact with the restoration surface and complement the access limitations of the aluminum-oxide discs.…”

Section: Introductionmentioning

confidence: 99%

Surface roughness and morphology of resin composites polished with two-step polishing systems

et al. 2014

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The purpose of this study was to investigate surface roughness (Ra) and morphology of supra-nanofilled [Estelite Omega (EO), Estelite ∑ Quick (EQ)], micro-hybrid [Esthet.X HD (EHD), G-aenial (GAE)] and nano-hybrid [Clearfil Majesty Posterior (CMP), Charisma Diamond (CD), Beautifil II (BII)] composites polished with two-step polishing systems [Enhance/PoGo (EP); Venus Supra (VS)]. Composite discs, 30 of each type, were prepared. Each composite group was divided into three subgroups: Mylar (control), EP and VS. Ra was evaluated with profilometer. In each composite group, the control had the lowest Ra. With both polishing systems, EO and EQ had significantly the lowest Ra, whereas CMP and BII had the highest. Except for GAE, CD and BII, the differences in Ra between EP and VS in each composite group were significant, showing smoother surfaces for EP. Supra-nanofilled composites created smoother surfaces than nano-hybrids, and their performance was similar or slightly better than that of micro-hybrids.

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The effects of finishing and polishing techniques on surface roughness and color stability of nanocomposites

Cited by 174 publications

References 40 publications

Color stability of recent composite resins

Color stability of recent composite resins

Spectrophotometric Evaluation of Color Changes of Bleach-shade Resin-based Composites after Staining and Bleaching

Surface roughness and morphology of resin composites polished with two-step polishing systems

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