The Effect of Different Curing Time Regimens on Immediate Postpolymerization Color Changes of Resin Composites

ABSTRACT Aim Light curing of resin composites may considerably change the color of resin composites. The aim of this study was to evaluate the changing pattern of resin composite's color by different curing times. Materials and methods Fifteen, 1 mm-thick, samples of each A2 shade Clearfill and Filtek P60 composites were prepared. First five samples were cured for 10s (400 mW/cm2) in each pole of the rectangular samples (right upper, right lower, left lower, left upper plus central zone). Consecutive sets of samples, each consists of five, were irradiated by doubling and tripling the curing time to 20 and 30s. Color change were measured by means of CIE 1976 L*a*b system equation (ΔE) for each digitalized picture of the corresponding sample. Results Color of samples was clinically significant changed by increasing the curing time from 10 to 20s and from 20 to 30s for Clearfil (ΔE = 13.86 and 14.11 respectively,) and Filtek P60 (ΔE = 7.68 and 11.66 respectively). The ‘b’ component change was responsible for the most color alteration confirmed by the linear regression model (p < 0.001). Conclusion This study revealed the contrasting pattern of resin composite's color change with the different curing times. Our findings support that light curing is accompanied by a higher attained blue chroma and diminished yellowness of resin composites. Clinical significance A complete and proper curing of sample resin composites on buccal surface of particular tooth, as a common practice to ensure the maximize concordance composite and tooth color, is reassured according to the considerable differences of undercured and overcured in comparison to normocured composite. How to cite this article Poorsattar Bejeh Mir A, Poorsattar Bejeh Mir M. The Effect of Different Curing Time Regimens on Immediate Postpolymerization Color Changes of Resin Composites. J Contemp Dent Pract 2012;13(4):472-475.

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Effect of Shortened Light-Curing Modes on Bulk-Fill Resin Composites

Operative Dentistry ◽

10.2341/19-101-l ◽

2020 ◽

Vol 45 (5) ◽

pp. 496-505

Author(s):

CS Sampaio ◽

PG Pizarro ◽

PJ Atria ◽

R Hirata ◽

M Giannini ◽

...

Keyword(s):

Tensile Strength ◽

Bond Strength ◽

Shear Bond Strength ◽

Light Output ◽

High Mode ◽

Resin Composites ◽

Curing Time ◽

Micro Computed Tomography ◽

Polymerization Shrinkage ◽

Light Curing

Clinical Relevance Shortened light curing does not affect volumetric polymerization shrinkage or cohesive tensile strength but negatively affects the shear bond strength of some bulk-fill resin composites. When performing shortened light curing, clinicians should be aware of the light output of their light-curing units. SUMMARY Purpose: To evaluate volumetric polymerization shrinkage (VPS), shear bond strength (SBS) to dentin, and cohesive tensile strength (CTS) of bulk-fill resin composites (BFRCs) light activated by different modes. Methods and Materials: Six groups were evaluated: Tetric EvoCeram bulk fill + high mode (10 seconds; TEC H10), Tetric EvoFlow bulk fill + high mode (TEF H10), experimental bulk fill + high mode (TEE H10), Tetric EvoCeram bulk fill + turbo mode (five seconds; TEC T5), Tetric EvoFlow bulk fill + turbo mode (TEF T5), and experimental bulk fill + turbo mode (TEE T5). Bluephase Style 20i and Adhese Universal Vivapen were used for all groups. All BFRC samples were built up on human molar bur-prepared occlusal cavities. VPS% and location were evaluated through micro–computed tomography. SBS and CTS tests were performed 24 hours after storage or after 5000 thermal cycles; fracture mode was analyzed for SBS. Results: Both TEC H10 and TEE H10 presented lower VPS% than TEF H10. However, no significant differences were observed with the turbo-curing mode. No differences were observed for the same BFRC within curing modes. Occlusal shrinkage was mostly observed. Regarding SBS, thermal cycling (TC) affected all groups. Without TC, all groups showed higher SBS values for high mode than turbo mode, while with TC, only TEC showed decreased SBS from high mode to turbo modes; modes of fracture were predominantly adhesive. For CTS, TC affected all groups except TEE H10. In general, no differences were observed between groups when comparing the curing modes. Conclusions: Increased light output with a shortened curing time did not jeopardize the VPS and SBS properties of the BFRCs, although a decreased SBS was observed in some groups. TEE generally showed similar or improved values for the tested properties in a shortened light-curing time. The VPS was mostly affected by the materials tested, whereas the SBS was affected by the materials, curing modes, and TC. The CTS was not affected by the curing modes.

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Color changes induced by different staining solutions and different light curing units in dental resin composites

Tanta Dental Journal ◽

10.4103/tdj.tdj_56_19 ◽

2020 ◽

Vol 17 (3) ◽

pp. 90

Author(s):

RaniaZ Mubarak ◽

AbeerI Abo El Naga

Keyword(s):

Resin Composites ◽

Dental Resin ◽

Color Changes ◽

Dental Resin Composites ◽

Light Curing

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Color Stability and Gloss of Esthetic Restorative Materials after Chemical Challenges

Brazilian Dental Journal ◽

10.1590/0103-6440201902263 ◽

2019 ◽

Vol 30 (1) ◽

pp. 52-57 ◽

Cited By ~ 1

Author(s):

Eduardo Haruki Ozera ◽

Fernanda Miori Pascon ◽

Américo Bortolazzo Correr ◽

Regina Maria Puppin-Rontani ◽

Aline Rogéria de Castilho ◽

...

Keyword(s):

Color Change ◽

Artificial Saliva ◽

Color Stability ◽

Initial Surface ◽

Resin Composites ◽

Cranberry Juice ◽

Color Changes ◽

Restorative Materials ◽

Post Hoc ◽

Acidic Beverages

Abstract This study evaluated gloss and color changes of esthetic restorative materials subjected to different acidic beverages. Specimens of resin composites (Z350XT (Z350), IPS Empress Direct (ED), Charisma Diamond (CD)) were prepared and the initial surface gloss and color (ΔE) were measured (n=10). Then, the specimens were immersed in 4 mL of each of the different beverages (cranberry juice; Coca-Cola; coffee or artificial saliva) during 15 min, 3x/day for 14 days and new gloss and color readings were obtained. Color change was evaluated with the ΔE formula and gloss change values were obtained by the formula: (final gloss - initial gloss). Data was submitted to two-way ANOVA followed by Tukey’s post hoc test (a=0.05). CD showed the lowest color change among resin composites. The highest ΔE values were obtained after immersion in coffee and cranberry juice. Coffee promoted the highest gloss change (worst gloss retention), followed by cranberry juice, Coca-cola and artificial saliva (p<0.05). The type of beverage significantly influenced the gloss of resin composites. Coca-cola reduced gloss of the three resin composites in a similar manner. Coffee affected the ED gloss more than that of Z350 and CD, while cranberry juice affected Z350 more than ED and CD. Saliva had a more pronounced effect on the gloss retention of CD than ED. The beverages used in this study influenced the optical surface properties of the composites studied.

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Effect of Staining Solutions on the Color Stability of Conventional and Bulk Fill Nanohybrid Resin Composites: A Spectrophotometric Analysis

Journal of Operative Dentistry & Endodontics ◽

10.5005/jp-journals-10047-0024 ◽

2017 ◽

Vol 2 (1) ◽

pp. 1-5 ◽

Cited By ~ 1

Author(s):

Jayaprakash Thumu ◽

Anirudh Kadiyala ◽

Indira Priyadarshini Bollu ◽

Srinidhi Vishnu Ballullaya ◽

Srihari Devalla

Keyword(s):

Color Change ◽

Color Stability ◽

Spectrophotometric Analysis ◽

Resin Composites ◽

Water Control ◽

Group Iii ◽

Color Changes ◽

Group I ◽

Immersion Period ◽

Friedman's Test

ABSTRACT Aim This study is aimed to evaluate the effect of staining solutions on the color stability of bulk fill and conventional nanohybrid resin composites (RCs) when subjected to various immersion periods. Materials and methods A total of 120 cylindrical Teflon molds (4 × 4 mm) were obtained and divided into four groups of 30 each. Molds of groups I and II were filled with Tetric N Ceram Bulk Fill (Ivoclar Vivadent, Schaan, Liechtenstein) and Filtek Bulk Fill (3M ESPE, St. Paul, MN, USA). Molds of groups III and IV were filled with Tetric N Ceram (Ivoclar Vivadent) and Filtek Z250 XTE (3M ESPE) incremental fill RC. Photo-activation was performed and specimens were incubated. Spectrophotometer analysis was done according to Commission Internationale d'Eclairage Lab color scale. After taking the baseline measurements, 10 samples from each group were immersed in distilled water (control, subgroup a), tea (subgroup b), and coffee (subgroup c) respectively, for 1, 7, and 30 days. The color values of each specimen were remeasured and color change value (E*ab) was calculated after 1, 7, and 30 days. Data were analyzed by Friedman's test and Mann–Whitney U-test; p < 0.05 is considered to be statistically significant. Results Group III specimens showed perceptible color changes at 30-day immersion period in coffee and tea. In group I specimens, color changes were perceptible at 7- and 30-day immersion periods in coffee and only 30-day immersion period in tea. Groups II and IV specimens showed perceptible color changes after all immersion periods in coffee and after 30 days in tea. Conclusion It can be concluded that Tetric N Ceram has less color change than the other nanohybrid RCs investigated when immersed in coffee and tea after various immersion periods. How to cite this article Thumu J, Kadiyala A, Bollu IP, Ballullaya SV, Devalla S. Effect of Staining Solutions on the Color Stability of Conventional and Bulk Fill Nanohybrid Resin Composites: A Spectrophotometric Analysis. J Oper Dent Endod 2017;2(1):1-5.

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Efficacy of Dental Bleaching with Whitening Dentifrices: A Systematic Review

International Journal of Dentistry ◽

10.1155/2018/7868531 ◽

2018 ◽

Vol 2018 ◽

pp. 1-8 ◽

Cited By ~ 3

Author(s):

Bruno G. S. Casado ◽

Sandra L. D. Moraes ◽

Gleicy F. M. Souza ◽

Catia M. F. Guerra ◽

Juliana R. Souto-Maior ◽

...

Keyword(s):

Systematic Review ◽

Randomized Clinical Trials ◽

Color Change ◽

Tooth Surface ◽

Cochrane Library ◽

Tooth Whitening ◽

Eligibility Criteria ◽

Tooth Color ◽

Color Changes ◽

Meta Analyses

A systematic review was performed to evaluate whether whitening toothpastes promote tooth whitening when compared to the use of conventional (nonbleaching) dentifrices. This review was registered at PROSPERO (CRD42017065132) and is based on the Preferred Reporting Items for Systematic Reviews and Meta-Analyses. Electronic systematic searches of PubMed/MEDLINE, Scopus, and the Cochrane Library were conducted for published articles. Only randomized clinical trials in adults that compared the use of so-called whitening dentifrices to the use of nonwhitening dentifrices were selected. The outcome was tooth color change. Twenty-two articles from 703 data sources met the eligibility criteria. After title and abstract screening, 16 studies remained, after which a further five studies were excluded. In total, nine studies were qualitatively analyzed. Significant differences in tooth color change were found between the groups using whitening dentifrices and those using nonwhitening dentifrices. Within the limitations of this study, the evidence from this systematic review suggests that bleaching dentifrices have potential in tooth whitening. However, although many whitening dentifrices have been introduced into the dental market for bleaching treatments, it is important to analyze tooth surface and color changes when performing home bleaching.

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Five-year color changes of light-cured resin composites: influence of light-curing times

Dental Materials ◽

10.1016/s0109-5641(99)00046-9 ◽

1999 ◽

Vol 15 (4) ◽

pp. 268-274 ◽

Cited By ~ 54

Author(s):

Y. Hosoya

Keyword(s):

Resin Composites ◽

Color Changes ◽

Light Curing

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

Current Dentistry ◽

10.2174/2542579x01666180416112018 ◽

2019 ◽

Vol 1 (1) ◽

pp. 46-52 ◽

Cited By ~ 1

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

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. 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, ΔL, Δa, Δb, and ΔE were calculated for each assessment time. Differences between the color changes observed in each session were assessed by Wilcoxon test (α = 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. 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 ΔL, and moderate coefficients with Δb, Δa, and ΔE. Conclusion: Despite the weak/ moderate correlation among the methods used to measure tooth color, all methods showed similar results of tooth bleaching effectiveness.

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The Effect of Curing Units and Staining Solutions on the Color Stability of Resin Composites

Operative Dentistry ◽

10.2341/07-3 ◽

2007 ◽

Vol 32 (6) ◽

pp. 616-622 ◽

Cited By ~ 39

Author(s):

A. R. Yazici ◽

Ç Çelik ◽

B. Dayangaç ◽

G. Özgünaltay

Keyword(s):

Clinical Relevance ◽

Immersion Time ◽

Resin Composite ◽

Color Stability ◽

Time Dependent ◽

Resin Composites ◽

Color Changes ◽

Light Curing

Clinical Relevance The color stability of resin composites did not vary based on the type of light curing unit. The effect of staining solutions on color changes in resin composites was resin composite and immersion time-dependent.

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