scholarly journals The Effect of Outdoor Weathering on Color Stability of Silicone and Acrylic Resin, Pigments-A Comparative Evaluation: An in vitro Study

2015 ◽  
Vol 5 (3) ◽  
pp. 81-85
Author(s):  
K Lekha ◽  
H Dharanendra Kumar
Keyword(s):  
Comparative Evaluation ◽  
Color Change ◽  
In Vitro Study ◽  
Color Stability ◽  
Acrylic Resin ◽  
Silicone Elastomer ◽  
Heat Cure ◽  
Outdoor Weathering ◽  
Cobalt Blue

ABSTRACT Maxillofacial prosthetic materials either resin or elastomer used for the fabrication of facial prostheses have their own physical and mechanical properties. Maxillofacial prosthesis frequent replacement because the elastomer or acrylic resin and its pigments undergo color changes. Purpose Evaluate the effect of outdoor weathering on color stability of silicone and heat-cure acrylic with two different pigments. Materials and methods Total of 80 circular disk specimens, 40 silicone elastomer and 40 heat-cure clear acrylic resin were fabricated in the prepared mold and two dry earth pigments burnt sienna and cobalt blue was added to the specimens and it was subjected to simulated outdoor weathering. Before and after weathering, CIE values of both control and weathering groups were recorded by using spectrophotometer and tabulated. The obtained data were subjected to statistical analysis. Results Silicone elastomer with burnt sienna showed more color change when exposed to weathering followed by silicone with cobalt blue. Heat-cure with cobalt blue had shown some color change, heat-cure and burnt sienna were the most color stable. Conclusion From the study, it can be concluded that heat-cure acrylic resin with burnt sienna most color stable than silicone elastomer. How to cite this article Lekha K, Kumar HD, Meshramkar R, Nadiger RK. The Effect of Outdoor Weathering on Color Stability of Silicone and Acrylic Resin, Pigments-A Comparative Evaluation: An in vitro Study. Int J Prosthodont Restor Dent 2015;5(3):81-85.

scholarly journals Comparative evaluation of color stability of three commercially available provisional restorative materials: An in vitro study

2021 ◽  
Vol 21 (2) ◽  
pp. 161
Author(s):  
CoraAbigail Coutinho ◽  
Divya Hegde ◽  
Vinita Sanjeevan ◽  
IvyFernandes Coutinho ◽  
Akansha Priya
Keyword(s):  
Comparative Evaluation ◽  
In Vitro Study ◽  
Color Stability ◽  
Vitro Study ◽  
Restorative Materials

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 < 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<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 Color Stability of Bulk Fill Composite Resins Submitted to Coffee Staining

2020 ◽  
Vol 24 (1) ◽  
Author(s):  
Beatriz Maria Arruda ◽  
Julio Cesar Bassi ◽  
Rafael Pino Vitti ◽  
Renata Siqueira Scatolin
Keyword(s):  
Analysis Of Variance ◽  
Composite Resin ◽  
Color Change ◽  
In Vitro Study ◽  
Color Stability ◽  
Composite Resins ◽  
Vitro Study ◽  
Change Analysis ◽  
Cie Lab

 Objective: The aim of this in vitro study was to evaluate the color stability of different bulk fill composite resins after extrinsic staining with coffee. Material and methods: Forty-eight disk-shaped specimens (6 mm diameter x 2 mm thick) of each composite resin were prepared for color change test. The composite resins were divided into 4 groups (n=12): one conventional composite resin (Filtek Z250) and three bulk-fill composite resins (Filtek Bulk Fill, Aura Bulk Fill, and Opus Bulk Fill). The samples were stained with 20 mL coffee solution for 7 days, with the solution being replaced every 24 h. The color change analysis was performed using a spectrophotometer, according to the CIE Lab formula. Data were analyzed using the Analysis of variance (ANOVA) and Tukey HSD tests (?=0.05). Results: The results revealed significant differences in color change among the composite resins tested (?<0.0001). The Aura Bulk Fill and Opus Bulk Fill showed the highest color change values. Conclusions: Thus, all the resins analyzed were susceptible to extrinsic staining with coffee, and the Filtek Bulk Fill showed the lowest color change value.

scholarly journals TO EVALUATE THE EFFECT OF MICROWAVE DISINFECTION ON THE HARDNESS OF HEAT CURE AND SELF CURE ACRYLIC RESIN : AN IN - VITRO STUDY

2015 ◽  
Vol 4 (41) ◽  
pp. 7127-7133 ◽  
Author(s):  
Neha Ahuja ◽  
Pakhan A J ◽  
Godbole S R ◽  
Seema Sathe ◽  
Yashshree Sancheti
Keyword(s):  
In Vitro Study ◽  
Acrylic Resin ◽  
Vitro Study ◽  
Heat Cure

scholarly journals Does Modification of Amalgomer with Propolis Alter Its Physicomechanical Properties? An In Vitro Study

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Reham M. Abdallah ◽  
Amr M. Abdelghany ◽  
Neven S. Aref
Keyword(s):  
Compressive Strength ◽  
Color Change ◽  
In Vitro Study ◽  
Ethanolic Extract ◽  
Color Stability ◽  
Physicomechanical Properties ◽  
X Ray ◽  
Group I ◽  
Significant Difference

Objective. To assess if incorporating ethanolic extract of propolis into ceramic-reinforced glass ionomer (Amalgomer CR) might have an influence on its physicomechanical properties. Materials and Methods. Three groups were assessed; group I: Amalgomer CR (control) and two experimental groups (II and III) of propolis added to the liquid of Amalgomer CR with 25 and 50 v/v %, respectively. Evaluation parameters were color stability, compressive strength, microhardness, and surface roughness. Representative specimens of each group were analyzed by Fourier-transform infrared spectroscopy, energy-dispersive X-ray, X-ray diffraction, and scanning electron microscopy. Analysis of variance (ANOVA) was used to compare the results, followed by a Tukey post hoc test (p<0.05). Results. Nonsignificant color change for both groups of modified Amalgomer CR. Meanwhile, the two experimental groups exhibited a significant increase in both compressive strength and microhardness. Simultaneously, there was a significant difference in roughness values among groups with the lowest roughness values exhibited by the 50 v/v % propolis concentration. Conclusions. Modification of Amalgomer CR with 50 v/v % propolis may increase its mechanical properties without compromising its esthetic. Clinical Significance. Modification of Amalgomer CR by 50 v/v % propolis is supposed to be a hopeful restorative material with favorable characteristics.

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