scholarly journals Effect of varying thickness and artificial aging on color and translucency of cubic zirconia and lithium disilicate ceramics

2021 ◽  
Vol 24 (3) ◽  
Author(s):  
Heba El-khayat ◽  
Hesham Katamish ◽  
Amr El-Etreby ◽  
Mostafa Aboushahba
Keyword(s):  
Repeated Measures ◽  
Artificial Aging ◽  
Color Change ◽  
Lithium Disilicate ◽  
Hydrothermal Aging ◽  
Cubic Zirconia ◽  
Color Changes ◽  
Varying Thickness ◽  
Before And After ◽  
Parameter Values

Objective: The aim of this study is to evaluate the effect of varying thickness and artificial aging on the color and translucency of cubic zirconia and lithium disilicate ceramics. Material and Methods: A total of 30 square shaped disks (12 mm x 12 mm) were fabricated from the cubic zirconia (Bruxzir Anterior) blank and lithium disilicate blocks (E.max CAD), used in three thicknesses (0.5mm, 0.8mm and 1mm). Portable spectrophotometer Vita Easyshade Advance was used to obtain color coordinates, which were substituted in formulas and used to calculate color change and translucency parameter values before and after aging (thermocycling for lithium disilicate and hydrothermal aging for cubic zirconia). Repeated measures Analysis of Variance (ANOVA) was used to study the effect of ceramic type, thickness, aging and their interaction on mean translucency parameter. Two-way (ANOVA) was used to study the effect of ceramic type, thickness and their interaction on mean color change (E). Results: Statistical analysis showed that E.max CAD HT is more translucent than Bruxzir Anterior. Translucency decreased as thickness increased. There was a statistically significant decrease in TP after aging for both materials. Lithium disilicate showed statistically significant greater E when subjected to aging than cubic zirconia, with both E values being clinically imperceptible. As thickness increased, E decreased. Conclusions: Thickness highly affected translucency and color of ceramics. As thickness increases, translucency parameter decreases and color change becomes less evident. Aging also causes a significant decrease in translucency parameter and induces color change however color changes are imperceptible. Keywords Aging; Ceramics; Color; Translucency.

scholarly journals Comparison of force degradation and color change of esthetic elastomeric chains

2021 ◽  
Vol 10 (4) ◽  
pp. e54310414307
Author(s):  
Maria Julia Lima Motta ◽  
Victor de Miranda Ladewig ◽  
Joel Ferreira Santiago Junior ◽  
Renata Rodrigues Almeida-Pedrin ◽  
Thais Maria Freire Fernandes Poleti ◽  
...  
Keyword(s):  
Repeated Measures ◽  
Visual Analysis ◽  
Color Change ◽  
Artificial Saliva ◽  
Time Interval ◽  
Color Changes ◽  
Before And After ◽  
Great Force ◽  
Initial Force ◽  
Elastomeric Chains

Objective: this study compared the force degradation and color change of esthetic elastomeric chains of four commercial brands. Materials and methods: the study analyzed 10 medium-force esthetic elastomeric chains with 6 links of Morelli, Orthometric, Eurodonto and 3M brands from sealed packages within the expiration date. The elastics were stretched twice their length, according to the manufacturer's recommendations, and were immersed in artificial saliva at 37°C. The forces were measured with an orthodontic dynamometer at onset and at intervals of 1, 7, 14, 21 and 30 days after immersion. The force degradation was evaluated calculating the percentage of force lost in relation to the initial force in each time interval, for each group tested separately and also between them. The color change was evaluated by visual analysis scale by observation of photographs of chain elastics before and after study completion by 31 examiners. The ANOVA test of repeated measures was applied considering 2 factors, time and groups, and the Tukey test was used for analysis of multiple comparisons. A significance value of 0.05% was adopted for the analyses. Results: the elastics showed great force degradation. After 7 days the groups presented degradation around 50% of the initial force. In the evaluation between groups, the elastics showed significantly different mean forces. When assessing color change, the scores assigned by examiners evidenced less color changes for elastics of Eurodonto brand. Conclusion: regardless of the commercial brand, transparent elastomeric chains show significant force degradation values ​​after 1 day. The scores assigned to color change evidenced that all commercial brands showed staining, with the best results for Eurodonto elastics.

scholarly journals Effect of In-Office Bleaching on Color and Surface Roughness of Composite Restoratives

2010 ◽  
Vol 04 (02) ◽  
pp. 118-127 ◽  
Author(s):  
Randa Hafez ◽  
Doa Ahmed ◽  
Mai Yousry ◽  
Wafa El-Badrawy ◽  
Omar El-Mowafy
Keyword(s):  
Surface Roughness ◽  
Surface Texture ◽  
Color Change ◽  
Distilled Water ◽  
Bleaching Agent ◽  
Color Changes ◽  
Before And After ◽  
Colorimetric Measurements ◽  
Natural Teeth ◽  
Environmental Sem

Objectives: The purpose of this study was to determine color changes and surface roughness of composites when they were subjected to in-office bleaching.Methods: 12 discs 15 mm in diameter and 2 mm thick were prepared from two shades (A2 & A4) of two composites, Durafil VS (DF) and TPH3 (TPH). Specimens were polished and stored in distilled water for 24 hours at 37°C before being subjected to bleaching, staining, and re-bleaching. Each of the groups of specimens (DF-A2, DF-A4, TPH-A2 and TPH-A4) were subdivided into three subgroups (n=4) and bleached with Beyond, LumaWhite-Plus, and Opalescence-Boost. Specimens were then stained by immersing them in a coffee solution for 48 hours at 37°C, and then they were re-bleached. Colorimetric measurements were performed at baseline, after bleaching, after staining, and after rebleaching. Surface roughness was determined with environmental SEM before and after bleaching. Data were statistically-analyzed.Results: None of the bleaching systems notably changed the color of composites (delta-E<2). Coffee staining affected DF specimens more than TPH. Stained specimens showed variable responses to whitening with no significant color change observed with TPH (delta-E<2) and significant changes observed with DF. Surface roughness significantly changed with bleaching, but the degree varied according to composite shade and bleaching agent.Conclusions: Three in-office bleaching agents had no significant color changes on two composites. DF showed more color change than TPH when immersed in coffee. Stained composites showed different degrees of whitening, with DF showing more response. Bleaching may adversely affect the surface texture of composites. Dentists should take into consideration that composite restorations may not respond to bleaching in the same way that natural teeth do. (Eur J Dent 2010;4:118-127)

scholarly journals Can ozone or violet light improve the color change or physicochemical properties of hydrogen peroxide-bleached tooth?

2021 ◽  
Vol 32 (4) ◽  
pp. 19-30
Author(s):  
Nayara Rodrigues Nascimento Oliveira Tavares ◽  
Alexia da Mata Galvão ◽  
Lia Dietrich ◽  
Roberta Furtado Carvalho ◽  
Robinson Sabino Silva ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Roughness ◽  
Color Change ◽  
Repeated Measure ◽  
Color Changes ◽  
Violet Light ◽  
Atomic Force ◽  
Measure Anova ◽  
Before And After ◽  
To Receive

Abstract: This study investigated the bleaching effectiveness and the physicochemical effects on enamel of violet light and ozone, associate or not to hydrogen peroxide, compared to 35%-hydrogen peroxide. Enamel-dentin blocks from human molars were randomly allocated to receive one of the following bleaching protocols (n=15): (HP) 35%-hydrogen peroxide, (VL) violet light, (OZ) ozone, the association between hydrogen peroxide with ozone (OZ+HP) or violet light (VL+HP). All protocols were performed in two sessions with a 48h interval. Color (spectrophotometer) and mineral composition (Raman spectroscopy) were measured before and after the bleaching. Color changes were calculated by ΔEab, ΔE00, and whitening index (WI). The surface roughness was measured with an atomic force microscope. Data were analyzed by One-way or Two-way repeated measure ANOVA followed by the Tukey’s test (α = 0.05). The lowest color change values (either measured by WI, ΔEab, or ΔE00) were observed for VL and OZ used with no HP. Violet light associate with HP was unable to improve the color changes observed for the peroxide alone, in combination with OZ and HP, the highest color changes were verified. Regardless of bleaching protocol, the bleached enamel presented higher contents of PO4 and CO3 -2 than those observed at baseline. All bleaching protocols resulted in similar enamel surface roughness. Both the VL and the OZ caused reduced effects on the enamel color change when used alone. The ozone therapy improved the bleaching effect in the group that received the association of HP.

Correlation Among Methods to Measure Tooth Color in Clinical Trials Evaluating Tooth Bleaching

2019 ◽  
Vol 1 (1) ◽  
pp. 46-52 ◽  
Author(s):  
André Luis Faria-e-Silva
Keyword(s):  
Repeated Measures ◽  
Color Change ◽  
Correlation Coefficients ◽  
Wilcoxon Test ◽  
Tooth Bleaching ◽  
Color Measurement ◽  
Tooth Color ◽  
Color Changes ◽  
Assessment Time ◽  
Shade Guide

<P>Objective: This study aimed to assess possible differences in results provided by two shade guides and a spectrophotometer used to measure the color changes during tooth bleaching. </P><P> Methods: Fifty-six patients underwent two sessions of in-office tooth bleaching with a 35% hydrogen peroxide with a week of an interval between them. The color evaluation was performed using shade match with two guide scales (Vita Classical, and Vita Bleach Guide) and a spectrophotometer providing CieLab data. The color was assessed at baseline and 7 days after each session, and 30 days after the last session. Data from scales were arranged in scores according to lightness (lowest to highest) and the color changes were calculated based on baseline data. For CieLab data, &#916;L, &#916;a, &#916;b, and &#916;E were calculated for each assessment time. Differences between the color changes observed in each session were assessed by Wilcoxon test (&#945; = 0.05). Friedman`s test and One-way repeated measures ANOVA were used to analyze color changes among the assessment times. Spearman`s test was used to evaluate the correlation between the shade guide scores and data from Cielab. </P><P> Results: All methods of color measurement demonstrated any additional effect of second bleaching session on color change, and stable color after 30 days (p < 0.001 for all methods). Both shade guide scales presented low correlation coefficients with &#916;L, and moderate coefficients with &#916;b, Δa, and &#916;E. </P><P> Conclusion: Despite the weak/ moderate correlation among the methods used to measure tooth color, all methods showed similar results of tooth bleaching effectiveness.</P>

scholarly journals Assessment of changes in color and color parameters of light-cured composite resin after alternative polymerization methods

2013 ◽  
Vol 07 (01) ◽  
pp. 110-116 ◽  
Author(s):  
Emine Sirin Karaarslan ◽  
Bulbul Mehmet ◽  
Ertas Ertan ◽  
Mehmet Ata Cebe ◽  
Aslihan Usumez
Keyword(s):  
Composite Resin ◽  
Color Change ◽  
Color Difference ◽  
Study Groups ◽  
Color Parameters ◽  
Color Changes ◽  
Yellow Color ◽  
Before And After ◽  
Total Color Change

ABSTRACTObjective:To examine the amount of change in color and color parameters of a composite resin (Filtek P60) polymerized by five different polymerization methods.Methods: A Teflon mold (6mm in diameter, 2mm in height) was used to prepare the composite resin discs (n=10). G1: Polymerization with inlay oven; G2: Polymerization with HQTH and autoclave; G3: Polymerization with LED and autoclave; G4: Polymerization with HQTH; G5: Polymerization with LED. Colorimetric values of the specimens before and after polymerization were measured using a spectrophotometer. The CIE L*a*b color system was used for the determination of color difference. Analysis of variance (ANOVA) was used to analyze the data for significant differences. Tukey’s HSD test and paired two-tailed tests were used to perform multiple comparisons (α=.05).Results: There were no significant differences in total color change (ΔE*ab) among the polymerization groups (P>.05). However, the lowest color change (ΔE*ab) value was 3.3 in LED and autoclave; the highest color change (ΔE*ab) value was 4.6 in HQTH. For all groups, CIE L*, C*ab and a*values decreased after polymerization (P<.05). The highest Δb* and ΔC*ab values were observed in specimens polymerized in an inlay oven (P<.05).Conclusion: Composite resin material showed color changes above the clinically accepted value in all study groups (ΔE*ab≥3.3). All specimens became darker during investigation (ΔL*< 0). Specimens polymerized with inlay oven presented the highest Δb* values which means less yellow color in specimens. (Eur J Dent 2013;7:110-116)

scholarly journals Comparative evaluation of the color stability of universal composites

2021 ◽  
Vol 11 (Suppl. 1) ◽  
pp. 234-237
Author(s):  
Merve Gürses ◽  
Nevin Çobanoğlu ◽  
Omar Faez Abdulateef
Keyword(s):  
Comparative Evaluation ◽  
Color Change ◽  
Native Speakers ◽  
Color Stability ◽  
Composite Resins ◽  
Control Group ◽  
Distilled Water ◽  
Color Changes ◽  
Before And After ◽  
Native Speakers Of English

Aim: The aim of this study is to compare the color stability of different universal composites and to evaluate the effects of keeping them in water for 1 week before coloring. Methodology: Filtek Ultimate (FU), Estelite Ʃ Quick (EQ), and Ceram X One (CX) composites were used. The specimens were kept in the dark, dry environment for 24 hours, then polished, and each composite group was divided into 3 groups: the control, the group that was kept in water for 1 week before coloring and coloring (n=7). The samples in the control group were kept in distilled water for 3 weeks. Samples in the coloring group were colored with coffee for 2 weeks (C), and the samples in the last group were kept in water for 1 week and then stained with coffee for 2 weeks (W+C) (n=7). Color measurements for all samples were taken twice, once before and once after the coloring period. The color changes of the samples were measured using the ∆E* parameter, which was calculated with before and after measurements.  Results: For all composite resins, the ΔE values of the samples in the W+C and C groups were significantly higher than those in the control group. When the composites were compared with each other, the differences between the ΔE values of the composites in the control, W+C, and C groups were not statistically significant. For FU and ESQ, at the end of the coloration period, there were no statistically significant differences between the W+C and C groups. However, for CX, the color change of the samples in the W+C group was significantly higher than that in  the C group. Conclusion: Storage in distilled water for 1 week before staining did not reduce the color change values of the samples. Thus, after composite restorations are performed, there is no need to advise patients to avoid staining foods, especially in the first week after restoration.   How to cite this article: Abdulateef OF, Çobanoğlu N, Gürses M. Comparative evaluation of the color stability of universal composites. Int Dent Res 2021;11(Suppl.1):234-7. https://doi.org/10.5577/intdentres.2021.vol11.suppl1.34   Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

scholarly journals Is It Necessary to Prepare the Enamel before Dental Bleaching?

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Andréa Dias Neves Lago ◽  
Patrícia Moreira de Freitas ◽  
Erika Michele dos Santos Araújo ◽  
Adriana Bona Matos ◽  
Narciso Garone-Netto
Keyword(s):  
Color Change ◽  
In Vitro Study ◽  
Surface Treatments ◽  
Dental Bleaching ◽  
Color Changes ◽  
Before And After ◽  
Knoop Microhardness ◽  
Previously Treated ◽  
Casein Phosphopeptide

The aim of this in vitro study was to assess the influence of distinct surface treatments on the microhardness and color of enamel that will be bleached. Surface treatments are tested, accordingly: G1, no treatment; G2, 2% sodium fluoride; G3, casein phosphopeptide paste; G4, 2% fluoride+Nd:YAG laser. Forty blocks from bovine teeth composed the sample that were tested in Knoop microhardness (n=10) and in color change (n=10). After 24 h, bleaching with 35% hydrogen peroxide was performed for 45 min. Microhardness and color changes (using parametersΔE,ΔL,Δa, andΔb) were assessed before and after bleaching. The data were analyzed by two-way ANOVA and Tukey’s test (p<0.05). Despite all surface treatments, a reduction of enamel microhardness occurred immediately after bleaching in all groups, being greater in G1. Enamel color changed in all groups. Immediately after bleaching, there was a decrease on enamel microhardness. However, after 7 days, some of those specimens previously treated before bleaching significantly recovered their initial microhardness without influencing the esthetic results of bleaching.

scholarly journals Chromatic analysis of orthodontic resin bonding agents exposed to different antiseptic mouthrinses

2021 ◽  
Vol 26 (2) ◽  
Author(s):  
Alana Dantas MOREIRA ◽  
Jamille Barros FERREIRA ◽  
Claudia Trindade MATTOS ◽  
Mariana MARQUEZAN ◽  
Mônica Tirre de Souza ARAÚJO ◽  
...  
Keyword(s):  
Artificial Aging ◽  
Color Change ◽  
Time Interval ◽  
Simulation Methods ◽  
Test Results ◽  
Bonding Agents ◽  
Color Changes ◽  
Significant Difference ◽  
Post Hoc ◽  
Resin Bonding

ABSTRACT Objective: To assess the color of different orthodontic resin bonding agents exposed to three antiseptic mouthrinses for a prolonged time interval (10-year aging simulation). Methods: 160 specimens were distributed into four groups, according to the orthodontic resin bond agent (Concise, Transbond XT, Transbond Plus Color Change, and Natural Ortho). Each group was exposed to different antiseptic mouthrinses: alcohol-based (Listerine®), alcohol-free (Oral-B®), chlorhexidine (Periogard®) and distilled water as the control. Specimens were submitted to two cycles of staining and artificial aging. Color was evaluated by means of a digital spectrophotometer at the beginning of the experiment and after every cycle. The system used to assess color changes was the CIE L*a*b*. Data was analyzed using the ANOVA and Tukey post-hoc test. Results: After simulation of 10 years of aging, Transbond XT and Natural Ortho composites presented no statistically significant differences in ∆E when exposed to different mouthrinses. The Concise composite specimens exposed to alcohol-free mouthrinse presented a significant difference when compared with specimens from the same group exposed to other antiseptic mouthrinses. Transbond Plus Color Change specimens exposed to chlorhexidine mouthrinse and to alcohol-containing mouthrinse presented a significant difference when compared with the specimens from the group exposed to water and alcohol-free antiseptic. Conclusion: All orthodontic resin bonding agents tested presented clinically perceptible color changes when exposed to at least one of the mouthrinses, except for the Natural Ortho composite. The Concise composite exposed to the alcohol-free solution was the resin that presented the highest color change values.

scholarly journals Surface Roughness and Translucency of Various Translucent Zirconia Ceramics after Hydrothermal Aging

2021 ◽  
Author(s):  
Chaimongkon Peampring ◽  
Santiphab Kengtanyakich
Keyword(s):  
Surface Roughness ◽  
Repeated Measures ◽  
Contrast Ratio ◽  
X Ray Diffraction ◽  
Hydrothermal Aging ◽  
Significant Difference ◽  
Before And After ◽  
Bonferroni Test ◽  
Group 2 ◽  
Group 1

Abstract Objective This study investigated the effect of hydrothermal aging on surface roughness and translucency of various translucent zirconia materials. Materials and Methods Four types of zirconia were tested. Group 1 was translucent zirconia with no cubic structure. Group 2, 3, and 4 included cubic-containing zirconia with different amounts of cubic structures (less than 30%, 30–50%, and more than 50%, respectively). Each group contained 15 disk-shape specimens with dimensions of 15 mm in diameter and 1 mm in thickness. As-sintered surface roughness, translucency parameter, and contrast ratio were evaluated in the two different sessions, before and after aging. Statistical Analysis Two-way repeated measures ANOVA with Bonferroni test was used to analyze statistically significant difference in those tested parameters. Phase structure before and after aging was analyzed by X-ray diffraction analysis (XRD). Results Groups 1 and 2 showed significant increased surface roughness after aging while groups 3 and 4 showed no alteration of surface. There was no effect of aging on translucency in all groups. After aging, group 1 and 2 presented monoclinic structure (16.63 and 5.01%, respectively). Conclusion Hydrothermal aging caused phase transformation and increasing surface roughness in group 1 and 2 but did not affect translucency in all groups.

scholarly journals Color change of composites on substrates treated with 0.2% chlorhexidine

2021 ◽  
Vol 69 ◽  
Author(s):  
Cristian SBARDELOTTO ◽  
Fernanda de Carvalho Panzeri PIRES-DE-SOUZA ◽  
Rafaella Tonani TORRIERI ◽  
Carolina Noronha Ferraz de ARRUDA
Keyword(s):  
Repeated Measures ◽  
Composite Resin ◽  
Color Change ◽  
Color Stability ◽  
Adhesive System ◽  
Color Changes ◽  
Composite Resin Restorations ◽  
Cie Lab ◽  
Self Etch ◽  
Resin Restorations

ABSTRACT Objective To evaluate the effect of 0.2% chlorhexidine digluconate (CHX) as a pretreatment of two types of adhesive systems on color stability of composite resin restorations. Methods Forty bovine teeth were prepared (6x6x2mm) and randomly divided into 4 groups (n=10): SB - total etch adhesive (Single Bond 2, 3M ESPE); SB + CHX - dentin pretreatment with CHX (30 seconds) followed by SB application; Adh - self-etch adhesive (AdheSE, Ivoclar Vivadent); Adh + CHX - pretreatment with CHX (30 seconds) + followed by Adh application. The teeth were restored with Filtek Z350XT (3M ESPE) and photoactivated for 40 seconds. Color measurements (EasyShade, VITA) were performed following the CIE Lab scale at baseline, 1 and 3 months (distilled water/37°C). The mean color change values (?E) and coordinates (L*, a* and b*) were statistically analyzed (2-way ANOVA, repeated measures, Bonferroni, p <.05). Results Results showed that there was a reddening and yellowing of the restorative material after 3 months, differing (p <.05) from 1 month. There was no difference (p >.05) regarding the treatment with CHX. Conclusions The 0.2% CHX adhesive pretreatment did not produce greater color changes in composite resin restorations irrespective of the type of adhesive system used. However, time had significant effect on the change, regardless of the substrate treatment.

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