Examinando por Materia "Polishing"

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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
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.