scholarly journals Color stability of esthetic coatings applied to nickel-titanium archwires

2017 ◽  
Vol 46 (5) ◽  
pp. 307-311
Author(s):  
Marcus Vinicius Neiva Nunes do REGO ◽  
Geórgia Wain Thi LAU ◽  
Yago Carneiro ARAÚJO ◽  
Rayssa Melo e SILVA
Keyword(s):  
Epoxy Resin ◽  
Color Change ◽  
Color Stability ◽  
Surface Characteristics ◽  
Nickel Titanium ◽  
Staining Solution ◽  
Color Changes ◽  
Significant Difference ◽  
Total Color Change ◽  
Coating Type

Abstract Introduction Color stability is an important feature to be considered when using esthetic coated archwires. Objective To evaluate color changes on the surface of esthetic nickel-titanium archwires coated with Teflon (Ortho Organizers, USA) or epoxy resin (Tecnident, Brazil) after immersion in staining solution. Material and method Twelve 20-mm-long wire segments were used for each type of coating, which were mounted as two test specimens with a width of 7 mm each. The buccal surface of the archwires was evaluated for fluorescence and color measurements both at baseline and after immersion in a staining solution for 21 days using the VITA Easyshade® Compact spectrophotometer (Model DEASYC220). Differences in total color change according to coating type were compared using an independent samples t-test (p<0.05). The surface characteristics of as-received coated archwires were assessed using scanning electron microscopy. Result Color changes were observed on the esthetic coatings, with a significant difference between the two brands analyzed. Surface analysis revealed flaws such as wear, pitting, elevations, lack of material, granulation, grooves, cracks, and lack of standardization in the coating process in all as-received archwires, but flaws were less evident in epoxy-resin coatings. Conclusion The two esthetic coatings did not show color stability, but Teflon coatings showed a more intense color change than epoxy-resin coatings.

scholarly journals Color stability and fluorescence of different orthodontic esthetic archwires

2012 ◽  
Vol 83 (1) ◽  
pp. 127-132 ◽  
Author(s):  
Dayanne Lopes da Silva ◽  
Claudia Trindade Mattos ◽  
Marcus Vinicius Almeida de Araújo ◽  
Antônio Carlos de Oliveira Ruellas
Keyword(s):  
Color Change ◽  
Color Stability ◽  
Nickel Titanium ◽  
National Bureau ◽  
Central Incisor ◽  
Fiber Reinforced Composite ◽  
Staining Solution ◽  
Color Changes ◽  
Reinforced Composite ◽  
Post Hoc

Abstract Objective: To evaluate the color stability of six esthetic archwires at different time periods and their fluorescence. Materials and Methods: Samples were evaluated after 7, 14, and 21 days of immersion in staining solution. Color measurements were performed by means of a spectrophotometer according to the Commission Internationale de I'Eclairage L*a*b* system, and color changes (ΔE*) and National Bureau of Standards units were computed. The fluorescence of as-received samples was evaluated by two observers and compared with that of a bovine central incisor. Statistical differences were investigated using analysis of variance and Tukey's post hoc test. Results: All brands showed statistically significant color change after 21 days (ΔE* from 1.88 to 12.06). The Optis archwire (fiber-reinforced composite) presented the highest color alteration, although staining was observed only near its ends. The Trianeiro archwire (coated nickel-titanium) and the Ortho Organizers archwire (coated stainless steel) presented with less color change. The Optis archwire was the only one that presented with fluorescence similar to that of bovine teeth. Conclusions: All esthetic archwires assessed showed clinically noticeable color change after 21 days in staining solution. The optical properties of currently available esthetic archwires may not yet be ideal.

scholarly journals Effect of an Optical Whitening Toothpaste on Color Stability of Tooth-Colored Restorative Materials

2020 ◽  
Vol 14 (01) ◽  
pp. 085-091
Author(s):  
Sedighe Sadat Hashemikamangar ◽  
Farnoosh Hoseinpour ◽  
Nazanin Kiomarsi ◽  
Mehrzad Gholampour Dehaki ◽  
Mohammad Javad Kharazifard
Keyword(s):  
Statistical Analysis ◽  
Color Change ◽  
Color Stability ◽  
Composite Resins ◽  
Time Points ◽  
Color Changes ◽  
Honestly Significant Difference ◽  
Significant Difference ◽  
Resin Modified Glass Ionomer ◽  
Composite Samples

Abstract Objectives This study aimed to assess the effect of an optical whitening toothpaste on color stability of microhybrid, nanofilled, and microfilled composite resins and resin-modified glass ionomer (RMGI) cement in comparison of two other toothpastes. Materials and Methods In this experimental study, disc-shaped composite samples were fabricated. The samples were then polished using silicon carbide papers. Twenty-seven samples of each material were fabricated and subjected to colorimetry using a spectrophotometer. Each group of material was then divided into three subgroups for the application of conventional whitening and whitening containing blue covarine toothpastes. One operator brushed the samples with an electric soft toothbrush with circular motion twice a day, each time for 30 seconds. Colorimetry was performed at 0, 1, 7, 30, and 90 days. Statistical Analysis Two-way analysis of variance (ANOVA), one-way ANOVA, and Tukey’s honestly significant difference (HSD) test were used for statistical analysis. Results The interaction effect of type of restorative material and time on ∆E was not significant at baseline or 1 day (p > 0.05). The effect of type of toothpaste on ∆E was not significant at baseline or 1 day (p = 0.78) but the effect of type of material was significant (p < 0.05). The toothpastes had significantly different effects on ∆E of Z250 at all time points (p < 0.05) except for ∆E0–30 (p = 0.106). The toothpastes had significantly different effects on ∆E of Z350 and Gradia at all time points (p < 0.05). The same was true for RMGI except for ∆E0–7 (p = 0.43) and ∆E0–90 (p = 0.52). The majority of color changes caused by toothpastes were not clinically perceivable (∆E < 3.3), except for ∆E0–90 by the whitening toothpaste (∆E = 9), ∆E0–90 by the conventional toothpaste for Z350 (∆E = 3.9), and ∆E0–1 by the whitening toothpaste for RMGI (∆E = 3.7). Conclusion The color change of all composite samples was not clinically perceivable (<3.3) at all time points, which shows that the tested toothpastes do not cause a significant change in color of composite materials.

scholarly journals Evaluation of color change in acrylic and bisacrylic resin resins in different solutions

2018 ◽  
Vol 5 (4) ◽  
pp. 76
Author(s):  
Mone Laiz Bortoli ◽  
Cristina Von Appen ◽  
Camila Longoni ◽  
Carmen Beatriz Borges Fortes ◽  
Jefferson Tomio Sanada
Keyword(s):  
Color Change ◽  
Color Stability ◽  
Acrylic Resin ◽  
Color Variation ◽  
Color Reading ◽  
Control Group ◽  
Color Changes ◽  
Significant Difference ◽  
Prosthesis Material ◽  
Chlorhexidine Solution

Aim: This work aimed to evaluate the color stability of an acrylic resin chemically activated (ARCA) using different handling techniques, and a bisacrylic resin when exposed to different pigmentation solutions.Material and Methods: Silicon matrixes were confectioned (10x10x3mm) to be used as specimens. The groups were designed as follows: Group Pot, Group Brush, Group Manufacturer and Group Bisacrylic (n=18). Each group was exposed to three different pigmentation solutions: distilled water, coke and chlorhexidine digluconate 0.12%. Three readings were performed for each specimen using a spectrophotometer, and the evaluations were carried out in three different time. After the color reading, three averages and the standard deviation of variation were performed after 24 hours (T1), 7 days (T2) and 14 days (T3). Data were submitted to the ANOVA and 2 criteria and Tukey (P<0.05) in the statistical software SSPS 18 for Macintosh (SPSS Inc., Chicago, USA).Results: When compared the solutions in each group of material, there was no statistically significant difference, except for T3, where the group Dencor Brush and Bisacrylic demonstrated higher color variation in all the solutions, even in the control group, and the values in Chlorhexidine higher than the other, showing greater instability after 14 days.Conclusions: With the results, bisacrylic resin used as provisory prosthesis material presents greater color instability than the ARCA, when submitted to different solutions. Bisacrylic resin and Dencor Brush present significantly visible color changes in chlorhexidine solution after 14 days. All the materials in coke solution present homogeneity in the color change after 7 days exposition to the solution, with no visible color change.

scholarly journals The effect of optical brightening toothpaste on the color stability of esthetic restorative materials

2021 ◽  
Vol 11 (Suppl. 1) ◽  
pp. 81-85
Author(s):  
Firdevs Kahvecioğlu ◽  
Elçim Çoban ◽  
Hayriye Esra Ülker
Keyword(s):  
Color Change ◽  
Calculated Data ◽  
Color Stability ◽  
Color Changes ◽  
Significant Difference ◽  
Restorative Materials ◽  
Cherry Juice ◽  
Native Speakers Of English ◽  
Materials Used ◽  
Post Hoc

Aim: The aim of this study is to evaluate the effects of whitening toothpaste applications on the color stability of different tooth-colored restorative materials (Fuji IX, GC Fuji II LC, Equia Forte, and Kerr Point 4)  Methodology: Standardized fourty disc-shaped specimens were prepared from esthetic restorative materials and polished. The baseline color values of each specimen were then measured using a spectrophotometer, according to the Commission Internationale de l'Eclairage L*, a*, and b* (CIELAB) color scale. Ten specimens from each group were then immersed in two different beverages (cherry juice and coke) for seven days. After immersion, the color value of each specimen was re-measured. Each sample was brushed with whitening toothpaste for 30 seconds using an electric toothbrush. The samples were kept in distilled water at room temperature and brushing continued twice a day for seven days. The color change value, Delta E (ΔE), was calculated. Data were analyzed by two-way ANOVA and post hoc Tukey's test. Results: When the results were evaluated, after the colored samples had been brushed with whitening toothpaste, a difference was found between the Delta E values according to the materials used (p<0.001), but no difference was found in relation to the beverages (p>0.001). When the values of the color changes were evaluated after the first brushing with whitening toothpaste and before the specimens were colored with drinks, a difference was observed in the Fuji II cola, Fuji II cherry, and Equia Forte cola groups (p<0.05). When the values of the color changes were evaluated for specimens in which brushing had been done twice a day for seven days with whitening toothpaste and before they were colored with drinks, a significant difference was observed in the Fuji II cherry and Equia Forte cola groups (p<0.05). Conclusion: Using Signal White Now whitening toothpaste for 2 min 2 times a day for seven days caused significant changes in the color of the restorative materials. The color change is dependent upon the type of restorative material that is used.   How to cite this article: Kahvecioğlu F, Çoban E, Ülker HE. The effect of optical brightening toothpaste on the color stability of esthetic restorative materials. Int Dent Res 2021;11(Suppl.1):80-4. https://doi.org/10.5577/intdentres.2021.vol11.suppl1.13   Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

Effect of Liquid Polishing System on Color Stability of Bleached Enamel

2013 ◽  
Vol 804 ◽  
pp. 141-145
Author(s):  
Xiu Lan Chen ◽  
Huang Qin Chen
Keyword(s):  
Red Wine ◽  
Color Change ◽  
Color Stability ◽  
Control Groups ◽  
Significant Difference ◽  
Before And After ◽  
Total Color Change ◽  
Post Hoc ◽  
And Control ◽  
One Way Anova

The purpose of this study was to investigate the effect of liquid polishing system (BisCover) on color stability of the bleached enamel upon exposure to a staining agent-red wine. Forty specimens were prepared. They were divided into 2 groups and different procedures, including only bleaching with Opalescence PF (PF) or Opalescence regular (R) gels, and application of BisCover after blaeching (PF-B, R-B) were used. Unbleached specimens were served as control groups (control-1 and control-2). The specimens were stored for 48 h in red wine. The color of all specimens was measured before and after exposure with a spectrophotometer, and total color change (ΔE*) were calculated. The data were analyzed with a one-way ANOVA and the means were compared by Tukeys post hoc analysis (α=0.05). PF-B and R-B groups demonstrated significantly less color change than PF and R groups. the control-1 and control-2 groups had the least color change. No significant difference were observed between PF and R group. BisCover improved the color stability of bleached enamel in red wine.

The Effect of Bleaching Agents on the Color Stability of Ceromer and Porcelain Restorative Materials In Vitro

2012 ◽  
Vol 38 (1) ◽  
pp. E1-E8 ◽  
Author(s):  
HB Kara ◽  
F Aykent ◽  
B Ozturk
Keyword(s):  
Color Change ◽  
Glass Ceramics ◽  
In Vitro Study ◽  
Color Stability ◽  
Color Changes ◽  
Bleaching Procedure ◽  
Significant Difference ◽  
Restorative Materials ◽  
The Difference

SUMMARY Purpose The aim of this in vitro study was to determine the color changes of five different restorative materials after exposing these materials to two different home bleaching agents. Methods This study applied bleaching agents to an ultralow-fusing porcelain, a low-fusing porcelain, two types of heat-pressed glass ceramics, and a ceromer. A total of 24 disc-shaped specimens were fabricated (with a diameter of 10 mm and a thickness of 2 mm) from each material (n=12). The initial color measurements were taken with a spectrophotometer. The first set of specimens were bleached with 10% hydrogen peroxide (HP) for one hour daily for 10 days. The other set of specimens were bleached with 10% carbamide peroxide (CP) bleaching gel for eight hours daily for 14 days. Data were analyzed with the one-way analysis of variance and Kruskal-Wallis statistical test. The difference in the prebleaching and postbleaching color of each material was considered to be statistically significant at p &lt; 0.05. Results The study found a statistically significant difference among the color changes of the test groups after exposing them to both bleaching agents (p&lt;0.05). Appreciable color change was observed in the Estenia (ΔE=3.99) specimens that were bleached with the HP, and noticeable color changes were observed in the Estenia (ΔE=1.89) and IPS Empress 2 (ΔE=1.66) groups when they were treated with the CP. Conclusions Restorations (especially polymer-containing restorative materials) should be protected before any bleaching procedure due to the high risk of color change.

scholarly journals The Effects of Natural Weathering on Color Stability of Impregnated and Varnished Wood Materials

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Turkay Turkoglu ◽  
Ergun Baysal ◽  
Hilmi Toker
Keyword(s):  
Scots Pine ◽  
Color Change ◽  
Color Stability ◽  
The Other ◽  
Natural Weathering ◽  
Color Changes ◽  
Oriental Beech ◽  
Total Color Change ◽  
Dark Color ◽  
Copper Arsenate

The aim of this study was to investigate effects of natural weathering on color stability of Scots pine (Pinus sylvestrisL.) and Oriental beech (Fagus orientalisL.) impregnated with some chemicals [tanalith-E (TN-E), adolit-KD5 (AD-KD5), and chromated copper arsenate (CCA)] and then varnished [synthetic varnish (SV) and polyurethane varnish (PV)]. While applying varnish increased lightness, impregnation decreased lightness of the wood specimens before natural weathering. Natural weathering caused greenish, bluish, and dark color tones of the wood surface. Total color change was increased with increasing exposure times in natural weathering. Untreated (control) wood specimens exhibited higher color changes than the other wood specimens in all the stages of natural weathering. The total color changes of untreated Oriental beech specimens were less than untreated Scots pine specimens. The color stability of impregnated and varnished wood specimens gave better results than untreated and solely varnished wood specimens after natural weathering. The best color stability was obtained from both Oriental beech and Scots pine wood impregnated with TN-E before PV coating.

Effect of Sodium Tripolyphosphate on Color Stability of In-Office Bleached Teeth

2013 ◽  
Vol 804 ◽  
pp. 57-61
Author(s):  
Huang Qin Chen ◽  
Bin Huang
Keyword(s):  
Red Wine ◽  
Color Change ◽  
Sodium Tripolyphosphate ◽  
Color Stability ◽  
Positive Control ◽  
Negative Control ◽  
Significant Difference ◽  
Before And After ◽  
Total Color Change ◽  
Post Hoc

The purpose of this study was to investigate the effect of polyanionsodium tripolyphosphate (STP) on color stability of the bleached enamel upon exposure to a staining agent-red wine. Thirty specimens were prepared and bleached with 35% hydrogen peroxide (HP). Then, they were divided into three groups and immersed in different experiment solutions, including distilled and deionized water (DDW, negative control), 2% STP (PH 9.0) and 1000 ppm NaF aq. (positive control), before and after red wine stain challenge, 3 times per day. The color of all specimens was measured before and after exposure to red wine with a spectrophotometer, and total color change (ΔE*) were calculated. The data were analyzed with a one-way ANOVA and the means were compared by Tukeys post hoc analysis (α=0.05). STP treatment group demonstrated significantly less color change than DDW and NaF groups (p<0.05). No significant difference was observed between DDW and NaF group. It can be concluded that the staining susceptibility of bleached enamel decreased after application of polyanion sodium tripolyphosphate.

scholarly journals In Vitro Effect of Denture Cleansers on the Color Stability of Polyetheretherketone and Other Denture Base Polymers

2021 ◽  
pp. 284-293
Author(s):  
Samet Tekin
Keyword(s):  
Color Change ◽  
Color Stability ◽  
Chemical Compositions ◽  
Denture Base ◽  
Color Changes ◽  
All Solutions ◽  
Significant Difference ◽  
Denture Cleansers

The aim of this in vitro study was to compare the long-term effect of overnight use of denture cleansers with different chemical compositions on the color stability of denture base polymers (DBPs). The four DBPs evaluated were PEEK (PK group), thermoinjection-molded polyamide (PA group), auto-polymerized polymethylmethacrylate (PMMA) (AP group), and heat-polymerized resin PMMA (HP group). The cleaning agents used were Corega tablet (CT), Protefix tablet (PT), and 0.5% sodium hypochlorite (NaOCl) solution (SH). Distilled water (DW) served as a control. Forty-eight disc-shaped specimens (10mm × 2mm) were prepared from each DBP and randomly immersed in the different storage media (n=12 in each group). Color measurements of the specimens before and after immersion in the denture cleansers were made using a spectrophotometer (VITA Easyshade V). The color changes were measured and recorded in L* a* b*. After 120 d, the CIEDE2000 formula was used to calculate color changes (∆E00). For analysis of the data, a multivariate analysis of variance was used (p<0.05).  The results of the statistical analysis revealed significant color change differences in the DBPs immersed in the various denture cleansers (p<0.05). Groups PA and PK showed the highest values for all solutions. AP-SH showed the highest ∆E00 value in group AP, no significant difference was found between other solutions. In group HP, there was no statistically significant difference between the average ∆E00 values of all solutions.  Long-term daily use of the denture cleansers affected the color stability of all the DBPs, although the level of color change was acceptable. Laboratory and clinical studies on the color stability of PEEK are needed to confirm the results of this study.

Effect of Children's Drinks on Color Stability of Different Dental Composites: An in vitro Study

2017 ◽  
Vol 41 (2) ◽  
pp. 120-125 ◽  
Author(s):  
Ahmed Nour El-din Ahmed Habib ◽  
Soad Abdelmoniem Abdelmoniem ◽  
Sara Ahmed Mahmoud
Keyword(s):  
Color Change ◽  
In Vitro Study ◽  
Color Stability ◽  
Dental Composites ◽  
Chocolate Milk ◽  
Water Control ◽  
Color Changes ◽  
Significant Difference ◽  
Mango Juice

Aim: To assess the effect of four different children's drinks on color stability of resin dental composites. Study design: A total of one hundred and twenty specimens were prepared from Grandio SO, Filtek Z350 XT and Filtek Z250 XT (forty specimens each). Specimens were thermocycled, then each group was further subdivided into four subgroups (n=10) according to the immersion media which were chocolate milk, mango juice, orange fizzy drink, and water (control). The initial color parameters of each specimen were recorded before immersion (baseline) and color change values were recorded three and seven days after immersion in each solution using a digital spectrophotometer. Atomic force microscope was used to measure the surface roughness in randomly selected samples after one week immersion in children's drinks. Results: All the children's drinks produced color changes in the examined resin dental composites, yet there was no statistical significant difference between the effects of tested drinks on the color changes (mean ΔE) of the three different dental composites (P&gt;0.05). Conclusions: All tested children's drinks caused clinically unacceptable color changes of the tested resin dental composites. Immersion in chocolate milk and orange fizzy led to the highest color changes in the tested resin dental composites.

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