scholarly journals Tooth color change due to different etching and debonding procedures

2018 ◽  
Vol 88 (6) ◽  
pp. 779-784 ◽  
Author(s):  
Hande Gorucu–Coskuner ◽  
Ezgi Atik ◽  
Tulin Taner
Keyword(s):  
Tungsten Carbide ◽  
Orthodontic Treatment ◽  
Color Change ◽  
Wilcoxon Test ◽  
Tooth Color ◽  
Group Iii ◽  
Color Changes ◽  
Intergroup Comparison ◽  
Different Color ◽  
Self Etch

ABSTRACT Objectives: To compare the effects of different etching techniques, 12–, 24–bladed tungsten carbide burs, and polishing discs on tooth color changes during orthodontic treatment. Materials and Methods: 59 individuals (mean age: 15.20 ± 1.59 years) were divided into four groups: 37% phosphoric acid and adhesive primer was used in Groups I and II whereas self–etch primer was used in Groups III and IV for enamel preparation. After orthodontic treatment, residual adhesives were cleaned with 12–bladed tungsten carbide burs in Groups I and III, while 24–bladed tungsten carbide burs were used in Groups II and IV. All teeth were polished with medium and fine Sof–Lex XT discs (3M ESPE, St Paul, Minnesota). Color measurements were taken from upper incisors and canines at pretreatment (T0), after cleaning with tungsten carbide burs (T1) and polishing with discs (T2). Wilcoxon test was used for evaluation of L*, a*, b* changes and Kruskal–Wallis for intergroup comparison of color changes. Results: L*, a*, b* values, except a* at Groups I, II, IV, and b* at Group III, changed significantly (P < .05). Groups III and IV showed significantly different color alterations from T0 to T1 (P < .05). After polishing, tooth color alterations were not significantly different among the groups. Conclusions: In self–etch bonding groups, a 12–bladed tungsten carbide bur caused less color change than the 24–bladed tungsten carbide bur. Orthodontic treatment resulted with visible and clinically unacceptable tooth color alterations regardless of the enamel preparation and clean–up techniques. Polishing reduced the effect of tungsten carbide burs, but did not affect the total influence of orthodontic treatment on the tooth color.

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 Influence of Mechanical and Chemical Degradation in the Surface Roughness, Gloss, and Color of Microhybrid Composites

2017 ◽  
Vol 18 (4) ◽  
pp. 283-288 ◽  
Author(s):  
Cleidiel AA Lemos ◽  
Silvio J Mauro ◽  
Paulo H dos Santos ◽  
André LF Briso ◽  
Ticiane C Fagundes
Keyword(s):  
Surface Roughness ◽  
Clinical Significance ◽  
Composite Resin ◽  
Color Change ◽  
Wilcoxon Test ◽  
Chemical Degradation ◽  
Color Changes ◽  
Final Data ◽  
Properties Of Materials ◽  
Spearman Test

ABSTRACT Aim The aim of this study was to investigate the association of different degradations on the roughness, gloss, and color changes of microhybrid composites. Materials and methods Ten specimens were prepared for Charisma, Amelogen Plus, Point 4, and Opallis resins. Surfaces were polished and baseline measurements of roughness, gloss, and color were recorded. Specimens were then submitted to chemical and mechanical challenges, and the specimens were reevaluated. Roughness and gloss were analyzed by Kruskal – Wallis and Dunn's test (p < 0.05). Color change (ΔE) was analyzed by one-way analysis of variance and Tukey's tests (p < 0.05). The initial and final data were compared using the Wilcoxon test (p < 0.05). Spearman test checked the correlation between the roughness and gloss (p < 0.05). Results Regarding surface roughness and gloss, there was no difference between composites before challenges. However, all composites showed a significant increase of roughness after challenges, with highest values for Charisma. The gloss was influenced by challenges, evidencing the best gloss for Point 4. Charisma showed the highest value of color change. There was no correlation between surface roughness and gloss for the initial analysis, and after the challenges. Conclusion Composites were influenced by association of challenges, and Charisma showed the highest changes for roughness, gloss, and color. Clinical significance The type of composite resin influenced the properties of materials, which are surface roughness, gloss, and color change. The dentist should be aware of the performance of different brands, to choose the correct required composite resin for each type of patient or region to be restored. How to cite this article Lemos CAA, Mauro SJ, dos Santos PH, Briso ALF, Fagundes TC. Influence of Mechanical and Chemical Degradation in the Surface Roughness, Gloss, and Color of Microhybrid Composites. J Contemp Dent Pract 2017;18(4):283-288.

In vitro assessment of tooth color changes due to orthodontic treatment using knowledge discovery methods

2015 ◽  
Vol 29 (20) ◽  
pp. 2256-2279 ◽  
Author(s):  
Anca-Stefania Mesaros ◽  
Sorina Sava ◽  
Delia Mitrea ◽  
Cristina Gasparik ◽  
Camelia Alb ◽  
...  
Keyword(s):  
Knowledge Discovery ◽  
Orthodontic Treatment ◽  
Tooth Color ◽  
Color Changes ◽  
In Vitro Assessment

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

2017 ◽  
Vol 2 (1) ◽  
pp. 1-5 ◽  
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.

scholarly journals Efficacy of Dental Bleaching with Whitening Dentifrices: A Systematic Review

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
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.

scholarly journals PROSES PEMBUNGAAN BEBERAPA VARIETAS Hoya coronaria DARI KAWASAN HUTAN KERANGAS AIR ANYIR, BANGKA

2018 ◽  
Vol 2 (1) ◽  
pp. 10-19
Author(s):  
Risti Annisa ◽  
Yulian Fakhrurrozi ◽  
Sri Rahayu
Keyword(s):  
Flower Development ◽  
Development Process ◽  
Color Change ◽  
Flower Color ◽  
Color Changes ◽  
Light Yellow ◽  
Heath Forest ◽  
The Difference ◽  
Different Color ◽  
Flowering Process

Hoya coronaria found in heath forest of Air Anyir, Bangka has diverse colors. Flowers color diversity sometimes correlated varieties or the result of color changes during flowering process. The flowers development process observed from 5 H. coronaria varieties with different color from heath forest of Air Anyir, Bangka.The purpose of this research to know the flowering process and flower color change process some varieties of H. coronaria. This research done from September 2015-January 2016. This study used qualitative method to made detail and systematic description about flowering phase. H.coronaria flowering process consists of flower initation, flower estabilisment and flower development. Flower initation needs 13-15 days, flower estabilisment needs 10-12 days and flower development consists of early blooming process, full blooming and senescene. Early blooming process needs 1-3 days, full blooming needs 5-12 days and senescene needs 1-3 days. During the development process changes from rounded to pentagonal shape and there is a change in size. The observation result showed that 5 varieties are different from one another based on the difference between the colors of the flowers. Variety 1 has yellow corolla without honey line and deep pink corona. Variety 2 has light yellow green corolla with strong pink honey line and moderate red corona. Variety 3 has moderate red corolla with moderate red honey line and moderate red corona. Variety 4 has light yellow green corolla with moderate pink honey line and light yellow green corona. Variety 5 has moderate red without honey line and grayish red corona

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

2012 ◽  
Vol 13 (4) ◽  
pp. 472-475 ◽  
Author(s):  
Arash Poorsattar Bejeh Mir ◽  
Morvarid Poorsattar Bejeh Mir
Keyword(s):  
Color Change ◽  
Central Zone ◽  
Resin Composites ◽  
Curing Time ◽  
Tooth Color ◽  
System Equation ◽  
Color Changes ◽  
Light Curing ◽  
Color Alteration ◽  
Clinically Significant

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.

scholarly journals EVALUATION OF SPECTROPHOTOMETER ANALYSIS OF BULK-FILL COMPOSITES IN VARIOUS DAILY USED BEVERAGES

2019 ◽  
Vol 3 (10) ◽  
Author(s):  
Dr. Shipra Nangalia Maitin ◽  
Dr. Nitin Maitin ◽  
Dr. Harsh Priyank ◽  
Dr. Swati Raj
Keyword(s):  
Color Change ◽  
Clinical Success ◽  
Color Stability ◽  
Visual Assessment ◽  
Composite Resins ◽  
Extrinsic Factors ◽  
Obvious Effect ◽  
Tooth Color ◽  
Color Changes ◽  
Conservative Dentistry

The visible color alterations in esthetic materials can also be ascribed to the proprietary differences in chemistry that may affect the polymerization, water sorption, and consequently the color stability of the material. In addition, the obvious effect of colorants in beverages and foods leads to extrinsic discoloration of composites. Thus, for suitable performance, longevity and good clinical success of esthetic restorations, the material of choice should present adequate inherent characteristics. The discoloration of tooth-colored, resin-based materials may be caused by intrinsic or extrinsic factors. Visual or instrumental techniques can be used to evaluate discoloration. The use of instrumental methods like spectrophotometers and colorimeters to quantify tooth color could potentially eliminate the subjective aspects of color assessment. Hence based on above findings the present study was planned for evaluation of spectrophotometer analysis of bulk-fill composites on various daily used beverages. The present study was planned in Department of Conservative Dentistry and Endodontics, Buddha Institute of Dental Sciences and Hospital, Patna, Bihar. The color of composite resins can be determined by varying methods, including visual assessment and instrumental measurement by a spectrophotometer. According to the Spectrophotometer results of this study, material tested became changes in color after immersion in the beverages. The data generated from the present study concludes that all the beverages used in this study changes in color in the material tested. Coca-Cola causes more color changes than other beverages in the material tested. The total changes of color after 1, and 7 days of composite immersion in coca cola were higher than the clinically acceptable threshold, and they are comparable to the color changes observed with coffee, tea, orange juice and beer, which are known as strong staining agents. Keywords: Spectrophotometer Analysis, Bulk-Fill Composites, Beverages, esthetic materials, color change, etc.

Is a Single Preliminary Session of In-office Bleaching Beneficial for the Effectiveness of At-home Tooth Bleaching? A Randomized Controlled Clinical Trial

2019 ◽  
Vol 44 (4) ◽  
pp. E180-E189 ◽  
Author(s):  
SC Vaez ◽  
ACC Correia ◽  
TR Santana ◽  
MLC Santana ◽  
AC Peixoto ◽  
...  
Keyword(s):  
Color Change ◽  
Tooth Bleaching ◽  
Controlled Clinical Trial ◽  
Fisher Exact Test ◽  
Tooth Color ◽  
Exact Test ◽  
Color Changes ◽  
Time Required ◽  
Preliminary Session ◽  
At Home

Summary Objectives: To evaluate the effect of combining in-office with at-home bleaching procedures in terms of the time required to obtain satisfactory tooth color, final color changes, and tooth sensitivity (TS) reported by patients. Methods and Materials: Twenty-six patients enrolled in this study used 10% carbamide peroxide in a bleaching tray for 1 h/d until satisfactory tooth color was obtained. One-half of the participants underwent a preliminary session of in-office tooth bleaching with 35% hydrogen peroxide for 45 minutes. The time in days for the patients to obtain satisfactory tooth color by at-home bleaching procedures was recorded. The color change of the maxillary canines was assessed using the Vita Bleachedguide 3D Master scale and a spectrophotometer at 1 week and after the end of bleaching procedures. Participants' satisfaction with their smile was recorded using a visual analog scale, and TS was determined throughout the entire treatment. Data were analyzed by t-test, Mann-Whitney test, or Fisher exact test (α=0.05). Results: The combined protocol reduced (by an average of 3.7 days) the time required to obtain satisfactory tooth color but increased the risk and level of TS. No difference in the final tooth color change (around 5.0 shade guide units; ΔE=11.6–14.9), or the level of patients' satisfaction with their smile, was observed. Conclusions: A preliminary session of in-office bleaching reduced the time necessary to obtain satisfactory tooth color with at-home bleaching but increased the risk and level of TS.

scholarly journals Effect of different surface finishing/polishing procedures on color stability of esthetic restorative materials: A spectrophotometric evaluation

2018 ◽  
Vol 12 (01) ◽  
pp. 049-056 ◽  
Author(s):  
Riccardo Beltrami ◽  
Matteo Ceci ◽  
Gabriele De Pani ◽  
Lodovico Vialba ◽  
Ricaldone Federico ◽  
...  
Keyword(s):  
Tungsten Carbide ◽  
Color Change ◽  
Color Stability ◽  
Surface Finishing ◽  
Control Group ◽  
Diamond Grit ◽  
Color Changes ◽  
Group 4 ◽  
Restorative Materials ◽  
Level Of Significance

ABSTRACT Objective: To evaluate the color stability of different esthetic restorative materials after surface finishing/polishing with different procedures. Materials and Methods: All materials were polymerized into silicone rubber rings to obtain specimens identical in size. Samples were randomly assigned into four groups (10 specimens of each composite for each group), and they were finished with different procedures: Control group (Group 1), three or two polishers interspersed with diamond grit (Groups 3 and 2, respectively), and one tungsten carbide bur + one polisher interspersed with diamond grit (Group 4). After staining process in coffee, a colorimetric evaluation according to the CIE L*a*b* system was performed by a blind trained operator at 7, 14, 21, and 28 days. Shapiro–Wilk test and Kruskal–Wallis analysis of variance were applied to assess significant differences among restorative materials. Means of the different polishing/finishing groups were compared with Scheffe’s multiple comparison test at the 0.05 level of significance. Results: In control group, significant lower discolorations were recorded for Essentia, Admira Fusion, and Estelite. After finishing, Filtek Supreme XTE and Ceram.X Universal showed a significantly lower degree of staining. The finishing technique used for Group 4 produced higher color changes. Conclusions: Tungsten carbide burs produced the higher color variations; after finishing, the nanofilled composites showed lower discoloration than nanohybrid ones, and the time of exposure to the staining agent and the polishing/finishing technique influenced the color change.

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