Examinando por Materia "Composite resin"

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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
Degree of pigmentation of resin and composite resin teeth acrylic in vitro tests and the influence of carbonated drinks Lima-2021
(Universidad Privada Norbert Wiener, 2023-04-13) Loayza Cáceres, Yessenia Leonor; Marroquín García, Lorenzo Enrique
The degree of pigmentation of teeth with composite resin and acrylic resin was determined in in vitro tests influenced by carbonated beverages. The total sample consisted of 32 teeth, divided into two groups of 16 elements, made of composite resins and acrylic resins. The study was longitudinal and experimental, comparing the degree of pigmentation due to exposure to carbonated beverages at 30 and 60 minutes. Statistical analysis was performed using Pearson's statistical test. The variations showed an initial average color value of composite resin and Coca-Cola of 92.3375, for Fanta® 92.4000; acrylic resin with Fanta® 79.9875, Coca-Cola® 81.6000. After 30 minutes of exposure, composite resin with Coca-Cola® had a value of 87.8125, Fanta® 91.5125; acrylic resin with Fanta® 85.5750, acrylic resin with Coca-Cola® 91.0125. After 60 minutes, composite resin with Coca-Cola® had a mean value of 80.4750, with Fanta® 81.8500, acrylic resin with Fanta® 81.4875, acrylic resin with Coca-Cola® 82.6000. Conclusion: Carbonated beverages influence the degree of pigmentation of teeth with composite and acrylic resins.
Acceso abierto
Effect of three beverages on the micro-strength of a composite resin: in vitro study
(Universidad Privada Norbert Wiener, 2019-08-15) Gómez Vásquez, Katty; Vilchez Bellido, Dina
The objective of this research was to compare the effect of three beverages on the microhardness of a composite resin in an in vitro study. The study was experimental, longitudinal, comparative, and prospective, with a comparative level, consisting of a sample of 10 composite resin discs per group, which were immersed in four immersion liquids, totaling 40 (n=40). The beverages used were an energy drink (Volt), a carbonated drink (Guaraná), a hydration drink (Gatorade), and as a control group, physiological serum. The results showed that the composite resin subjected to the energy drink Volt had an initial microhardness of 76.27 ± 4.74 Kg/mm² and a final microhardness of 70.04 ± 3.92 Kg/mm²; the composite resin subjected to the carbonated drink Guaraná had an initial microhardness of 77.04 ± 2.69 Kg/mm² and a final microhardness of 73.32 ± 3.59 Kg/mm²; the composite resin subjected to the hydration drink Gatorade had an initial microhardness of 78.48 ± 5.33 Kg/mm² and a final microhardness of 70.96 ± 2.18 Kg/mm²; while the composite resin subjected to physiological serum had an initial microhardness of 80.06 ± 3.48 Kg/mm² and a final microhardness of 70.15 ± 2.60 Kg/mm². A statistically significant difference was found between the initial and final microhardness of the composite resin subjected to the energy drink Volt, hydration drink Gatorade, and carbonated drink Guaraná (p<0.05). Conclusion: A variation between the initial and final microhardness of the composite resin was observed when subjected to the different beverages studied.
Acceso abierto
Effectiveness in the adhesion of three types of composite resins as an alternative for the repair of porcelain in fixed prostheses: a comparative in vitro study, Lima 2019
(Universidad Privada Norbert Wiener, 2019-11-06) Guzmán Lavado, Ivan Erasmo; Girano Castaños, Jorge Alberto
Oral rehabilitation in fixed prosthesis treatments with metal-ceramic materials is widely used today, but these materials can fracture due to multiple factors. However, this situation does not always lead to replacement. Repairing porcelain with composite resin is an alternative with advantages such as easy handling and low cost. The main objective of this thesis was to determine the effectiveness of adhesion of three types of composite resins used as alternatives for repairing porcelain in fixed prostheses in Lima, 2019. This study was experimental, analytical, prospective, and cross-sectional. Feldspathic ceramic IPS CLASSIC V was used as the base material to evaluate the adhesion of three types of composite resins: Master Fill resin, Tetric N-Ceram resin, and Filtek Z350 XT resin. The microtensile bond strength (μTBS) was evaluated using a digital universal testing machine CMT-5L, LG, at a speed of 0.5 mm/min. The results showed that Filtek Z350 XT resin had the highest average adhesion level with 11.32% Mpa, Tetric N-Ceram resin achieved a regular level of 10.17%, and Master Fill resin showed the lowest level with 8.32% Mpa.
Acceso abierto
Influence of polishing on dental composite resins on chromatic differentiation compared to a pigmenting drink. Lima 2021 in vitro study
(Universidad Privada Norbert Wiener, 2022-08-26) Sencebe Marcaval, Paola Gina; Garavito Chang, Enna Lucila
Objective: To compare the influence of polishing on dental composite resins in color differentiation when exposed to a staining beverage. Methodology: Two dental resins used for anterior restorations (Z350XT and Tetric N-Ceram) were employed. These resins were molded into discs with a diameter of 10 mm and a thickness of 2 mm using an acrylic mold, adding layers of 2 mm resin until the desired dimensions were achieved. Additionally, three polishing systems (Sof-Lex discs, rubber cups, and Astrobrush) were used to generate a smooth and polished finish on the resin discs. The initial color of these discs was identified using a digital colorimeter (Vita Easyshade V), and the data were recorded in the data collection sheet. Subsequently, the resin discs were immersed in Coca-Cola for 15 days, after which they were removed from the containers, rinsed, and dried. The color was measured again using the digital colorimeter. The data were tabulated and processed using statistical analysis with Student's t-test and ANOVA. Results: The influence of polishing on Filtek Z350XT resin was 4.6 when polished with Sof-Lex discs, 7 with rubber cups, and Astrobrush. On the other hand, the influence of polishing on Tetric N-Ceram resin was 5.2 with Sof-Lex discs, 5.6 with rubber cups, and 6.4 with Astrobrush. Conclusion: The least influence of polishing was observed with the rubber cup and Astrobrush on Filtek Z350XT composite resin, while the greatest influence of polishing was observed with the Sof-Lex disc on Filtek Z350XT composite resin.