Examinando por Materia "Variación volumétrica"

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    Volumetric variation of two silicones by condensation SPEEDEX and ZETAPLUS when polymerizing over time
    (Universidad Privada Norbert Wiener, 2021-10-21) Dominguez Ruiz, Yamyr; Llerena Meza De Pastor, Verónica
    Objective: To compare in vitro the volumetric differences of two condensation silicones (Speedex and Zetaplus) at 5 and 30 minutes, 1, 24, and 48 hours. Materials and Methods: A total of 24 samples were obtained from two brands of heavy condensation silicones (Speedex and Zetaplus) in a 5cc³ matrix. The materials were activated and subsequently weighed on a sensitive digital scale at different times following activation. The volumes of the samples were calculated from the weights obtained and then compared. Results: Non-parametric Friedman's test and Student's t-test for independent groups were performed. The mean volumetric variation in the Zetaplus group was -0.00012 with a standard deviation of 0.00001, while the Speedex group showed a mean of -0.00009 with a standard deviation of 0.00002. Statistically significant differences were found between the two groups (p<0.05). At 30 minutes, volumetric variations were smaller but still significantly different between the silicones. Conclusions: Speedex heavy silicone exhibited significantly lower volumetric variation than Zetaplus silicone at 5 and 30 minutes, but not at later times. Both condensation silicones, Speedex and Zetaplus, showed significant volumetric variations at 5 and 30 minutes, 1 hour, 24 hours, and 48 hours.