Examinando por Autor "Nuñez Linares, Merly"

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    Comparative analysis of surface microhardness of nanohybrid and bulk fill resins using two polishing systems. In vitro study. Lima, Peru 2021
    (Universidad Privada Norbert Wiener, 2022-09-30) Nuñez Linares, Merly; Guevara Sotomayor, Juan César
    Objective: To compare the surface microhardness of Nanohybrid and Bulk Fill resins using two polishing systems. In vitro study. Lima, Peru, 2021. Methodology: The dental resins Filtek Z350 XT and Filtek Bulk Fill were molded into discs with a height of 5 mm and a diameter of 4 mm, using increments of 2 mm for Filtek Z350 XT and 4 mm for Filtek Bulk Fill. The resin discs were divided into two groups and polished using Sof-Lex discs and rubber cups. The sample size was determined through sample calculation, with 14 resin discs of each type, which were evaluated using a Vickers hardness machine (Durometer), producing indentations on the surface of the resin discs to determine the microhardness of each polished resin. Data were processed using SPSS software and the Student's t-test was applied for statistical analysis. Results: The surface microhardness of the Nanohybrid resin, Filtek Z350 XT, using the Sof-Lex disc polishing system was 67.81 ± 1.93 Hv, while using the rubber cup polishing system, it was 69.16 ± 3.57 Hv. The surface microhardness of the Bulk Fill resin, Filtek Bulk Fill, using the Sof-Lex disc polishing system was 51.59 ± 3.75 Hv, while using the rubber cup polishing system, it was 50.68 ± 1.90 Hv.