Examinando por Materia "Color stability"

Mostrando 1 - 7 de 7

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Chromatic stability against coffee of an acrylic and bis-acrylic resin used for the manufacture of provisional crowns in fixed prosthesis. In vitro study. Lima, Peru 2022
(Universidad Privada Norbert Wiener, 2023-11-30) Barrionuevo Salgado, Katya Eleuteria; Guevara Sotomayor, Juan César
Objective: To determine the color stability of an acrylic and a bis-acrylic resin when exposed to coffee, used for the fabrication of provisional crowns in fixed prosthodontics. Methodology: An experimental study with a quantitative approach and applied type, using a hypothetical deductive methodology. An acrylic resin (Alike) and a bis-acrylic resin (Visalys Temp) were used to create 10 mm diameter by 2 mm thick discs. Once the discs were prepared, their initial color was checked using the Vita classical shade guide, and the information was recorded in the data collection form. A total of 11 discs of each type were made and immersed in two glass containers containing a coffee solution for a period of 1 week. The discs were only removed from the container to assess color stability at 1 hour, 24 hours, and one week after exposure. Results: The acrylic resin Alike showed a color variation of 0.45 after 1 hour of exposure to coffee, 3.82 after 24 hours, and 4.27 after 1 week. Meanwhile, the bis-acrylic resin Visalys Temp showed a color variation of 8.64 after 1 hour, 12.82 after 24 hours, and 13.91 after 1 week of exposure. Conclusion: Both resins showed color variation, with the bis-acrylic resin showing more noticeable changes in the same period of time
Acceso abierto
Chromatic stability of Palfique lx5 and Filtek z350 composite resins against chicha morada, green tea and Cocacola, in vitro comparative study. Lima 2018
(Universidad Privada Norbert Wiener, 2021-10-23) Misajel Aquino, Carlos Darwin; Girano Castaños, Jorge Alberto
The purpose of this study was to evaluate the color stability of two composite resins exposed to different staining agents. A total of 56 composite resin samples were prepared, with 28 samples of Filtek Z350 and 28 of Palfique LX5. Each resin group was divided into subgroups of 8 samples for each staining substance: chicha, Coca-Cola, and tea, and 4 samples for the control group. Color stability was analyzed using Photoshop software, providing mean values on a grayscale. Data were analyzed using ANOVA and Student's t-test for hypothesis testing of differences. Results: The control group had the highest mean value (144.23±1.67) within the Filtek Z350 resin group, showing a significant difference compared to the staining agent groups (p<0.05). In the Palfique LX5 resin group, the control group and Coca-Cola showed the highest values, significantly differing from the tea (p<0.05) and chicha (p<0.05) groups. Significant differences were found between both resin groups within each staining agent and control group (p<0.05). Conclusion: The effect of pigments on color stability was lower in the control group for Filtek Z350 resin. However, for Palfique LX5 resin, the greatest color effects were observed in the control and Coca-Cola groups, followed by tea, with chicha showing the lowest value.
Acceso abierto
Colour stability in composite resin and giomer subjected to pigmented beverages: comparative in vitro study, Lima 2018
(Universidad Privada Norbert Wiener, 2019-01-23) Velasco Delgado, Anghely; Reynafarje Reyna, Julio César
The purpose of this research was to determine the color stability in a composite resin and a giomer, both subjected to three pigmented beverages: coffee, wine, and purple corn for 24 hours. The study was experimental, involving a sample of 30 specimens of composite resin and giomer, divided into 6 groups with 5 specimens per pigmented beverage. Each specimen had a diameter of 10mm and a height of 2mm. The specimens were submerged in 3 pigmented beverages: coffee, wine, and purple corn for a period of 24 hours. The instrument used was the Chromascop colorimeter, as it is the most widely used in daily professional practice. The database was entered into an Excel 2016 spreadsheet and later processed in the SPSS 25 statistical program. A 5% confidence level and a 95% confidence interval were applied. The results showed that in both the composite resin and giomer groups, color stability was higher with coffee and purple corn, both showing a 33.3% stability rate. An association between color stability and the pigmented beverages was observed in each group. The study concluded that there were no differences in color stability between composite resin and giomer when subjected to the three pigmented beverages.
Acceso abierto
Effect of glycerinon color stability in a nano-filled resin exposed to drinks carbonated, Lima 2022
(Universidad Privada Norbert Wiener, 2023-11-05) Alberca Estela, Cintya Margarita; Guevara Sotomayor, Juan César
The objective of this study was to determine the color stability of a nanofilled resin with and without glycerin exposure to carbonated beverages. Methodology: Three carbonated beverages (Coca Cola®, Inka Cola®, and Red Bull®) were used as liquid pigments against the nanofilled resin (Filtek Z350 XT), which was previously molded into discs measuring 10 x 2 mm. These discs were divided into two groups: one group had glycerin gel applied to its surface before the final photopolymerization, while the other group did not. The initial color of the discs was identified using the Vita classical color guide through visual method. Once the colors were identified, the discs were placed in separate groups and each group was submerged in a container with a different carbonated beverage. The resin discs remained in the containers for a period of 14 days, being removed only at 7 and 14 days to verify the color. This information was tabulated and processed using ANOVA statistical analysis. Results: The Z350 XT resin, with and without glycerin, exposed to Coca Cola®, Inka Cola®, and Red Bull® for 14 days showed no significant color variation (p > 0.05). Conclusion: The color stability of nanofilled resin with and without glycerin exposed to carbonated beverages was similar.
Acceso abierto
Effect of pigmenting beverages on the color stability of composite resins. In vitro study. Lima - Peru. 2021
(Universidad Privada Norbert Wiener, 2021-10-26) Huarcaya Cahuana, Marialejandra; Huamani Caquiamarca, Yuliana Esther
The aim of this research was to determine the effect of pigmented beverages on the color stability of composite resins. Three pigmented beverages (Coca-Cola, red wine, and Red Bull) were used to induce color variation in resins, which were previously molded into discs with a 10mm diameter and 2mm thickness. The initial color of the discs was identified using a visual method and a Vita Classical colorimeter, which has a numerical scale to assess each color tone, ranging from 1 to 16, representing the color scale from B1 to C4. Once the colors of each resin disc were identified, they were separated into groups, and each group was immersed in a container with a different pigmented beverage. The resin discs remained in the containers for 15 days, with the beverage being replaced every 24 hours with an identical one. After 15 days, the resin discs were removed, rinsed with plenty of water, and dried with air before their color was recorded again using the visual method. The data were tabulated and processed using ANOVA statistical analysis. The results showed that the composite resin Tetric N-Flow varied 3.3 ± 1.83 with Coca-Cola, 5 ± 0.0 with Red Bull, and 10.7 ± 2.5 with red wine. The composite resin Tetric N-Ceram varied 0.7 ± 1.83 with Coca-Cola, 1.4 ± 0.84 with Red Bull, and 10.4 ± 2.8 with red wine. Finally, the composite resin Filtek Bulk Fill varied 1.0 ± 0.0 with Coca-Cola, 0.7 ± 0.48 with Red Bull, and 7.8 ± 3.22 with red wine. It was concluded that red wine caused the greatest color variation compared to the other pigmented beverages.
Acceso abierto
Effect of three pigment solutions on the stability chromatic in stock artificial teeth for prosthetics. In Vitro Lima 2021
(Universidad Privada Norbert Wiener, 2022-12-07) Mamani Mamani, Tania Johana; Llerena Meza De Pastor, Verónica
Objective: To determine the effect of three pigmenting solutions on the color stability of stock acrylic teeth for prostheses in vitro. Methodology: The research was experimental, using 80 Olympic acrylic teeth, divided into four experimental groups of 20 teeth each, with each group exposed to one of the pigmenting substances: coffee, carbonated beverage, red wine, and distilled water (the control group). The statistical test used was ANOVA to assess differences between groups, and for multiple comparisons, the Tukey and Duncan tests were applied with an error margin of 0.05. Results: Coffee was the pigmenting solution that caused the most significant chromatic variation in Olympic acrylic teeth, with an average variation of 3.56, followed by red wine with an average variation of 2.12, carbonated beverage with 2.06, and distilled water with an average variation of 1.50. Conclusion: Coffee was the pigmenting solution that caused the most significant chromatic variation in Olympic acrylic teeth, followed by red wine, and finally, the carbonated beverage.
Acceso abierto
In vitro study on the color stability of two dental resins (Omnichroma Y Z350XT) against three pigmenting beverages (coffee, coca cola and chicha morada) most consumed by the population of Lima. Lima Peru. 2021
(Universidad Privada Norbert Wiener, 2022-05-06) Baños Chaparro, Mirka Fiorella; Vergara Pinto, Brenda Roxana
The aim of this study was to compare the color stability of two dental resins exposed to three commonly consumed staining beverages in the population of Lima. Two resins were used for aesthetic zone restorations (Omnichroma and Z350XT), and three staining beverages (coffee, Coca-Cola, and purple corn drink). The resins were formed into discs with a diameter of 10 mm and a thickness of 2 mm, using a mold where increments of 2 mm of resin were added until the required disc dimensions were achieved. Once the resin discs were made, the initial color was checked using the Vita classical color guide, and this information was recorded on the data collection sheet. In total, 30 discs of each resin type were made, with 10 discs for each beverage studied, for a total of 60 discs. The beverages were then prepared in separate jars, with 40 ml of each substance poured into a different jar. The resin discs were submerged in the beverages for 15 days, with the beverage being replaced after 7 days with the same substance. After 15 days, the discs were removed, rinsed, and dried, and the color was measured again, with the data recorded on the data sheet.