Examinando por Materia "Estabilidad cromática"

Mostrando 1 - 4 de 4

Acceso abierto
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 in polished and unpolished nano-hybrid resins from 2 different brands, immersed in pigment solutions
(Universidad Privada Norbert Wiener, 2024-06-14) Castillo Tasayco, José Luis; Llerena Meza De Pastor, Verónica
The objective of this study was to determine the chromatic stability in nano-hybrid resins with and without polishing from two different brands, immersed in pigmenting solutions. The methodology used was inductive, with a quantitative, experimental, longitudinal, and prospective approach. Two pigmented beverages were used: a carbonated beverage and purple corn drink. A total of 80 resin discs were used, divided into 10 discs of each brand, with polishing and without polishing (3M Z350 XT and Tetric N-Ceram). These resin discs, with a diameter of 10mm and a thickness of 2mm, were immersed for 10 days in containers with the carbonated beverage and purple corn drink. The Sof-Lex disc system (3M) was used for polishing the resin discs. All measurements were taken using a Chromascop colorimeter, and the data collection instrument was validated by experts. The results showed that polished resin discs of the 3M Z350 XT and Tetric N-Ceram brands, immersed in carbonated beverage, underwent a color change of 2 shades, while non-polished resin discs of the same brands experienced a color change of 5 shades. This study concluded that the chromatic stability of both 3M Z350 XT and Tetric N-Ceram resins, whether polished or not, changes when exposed to pigmented beverages. It was also concluded that polishing the 3M Z350 XT and Tetric N-Ceram resins is a crucial factor in maintaining better chromatic stability.
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
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.