Examinando por Materia "Nanopartículas de circonio"

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    Mechanical surface microhardness of a thermo-curing acrylic resin associated with zirconium nanoparticles
    (Universidad Privada Norbert Wiener, 2023-10-23) Apomayta Hinojosa, Michael; Vilchez Bellido, Dina
    Objective: To determine the mechanical surface microhardness of a thermocured acrylic resin associated with zirconium nanoparticles, Lima - Peru. Materials and Methods: This research is an in-vitro experimental study, cross-sectional, and prospective. The sample consisted of 03 study groups, which were further divided into 06 subgroups, measured at 24 and 48 hours, and met the inclusion and exclusion criteria. The equipment used for the measurement of mechanical surface microhardness was the Vickers microhardness tester, and the data was recorded on a data collection form. Statistical analysis was conducted using the Shapiro-Wilk test, and for bivariate analysis of the mechanical surface microhardness values between the materials, the ANOVA-Tukey test (24 hours) and Kruskal-Wallis with post hoc Dwass-Steel-Critchlow-Fligner pairwise comparisons (48 hours) were used. Comparisons between the 24-hour and 48-hour results were made using the Mann-Whitney U test and Student's T-test. All tests were analyzed with a 95% confidence level. Results: The acrylic resin associated with 3% zirconium nanoparticles showed the highest bond strength value (p < 0.05), followed by the acrylic resin.