Effect of Pressure, Post-Pressing Time, and Polymerization Cycle on the Degree of Conversion of Thermoactivated Acrylic Resin

Autor: Rafaella de S. Leão, Sandra L. D. de Moraes, Kátia A. da S. Aquino, Cristina P. Isolan, Bruno G. da S. Casado, Marcos A. J. R. Montes
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: International Journal of Dentistry, Vol 2018 (2018)
Druh dokumentu: article
ISSN: 1687-8728
1687-8736
DOI: 10.1155/2018/5743840
Popis: Herein, the effect of different post-pressing times and pressure in two cycles of polymerization on the degree of conversion (DC) of thermally activated acrylic resin (TRRA) is analyzed to optimize the polymerization of this material. After post-pressing for 0, 6, or 12 h, polymerization was performed with or without a pressure of 60 psi (0.41 MPa) in a short (4 h) or a long (11 h) cycle, totaling 12 groups. To determine the DC, PMMA specimens were analyzed by Fourier transform infrared spectroscopy. The influence of each factor alone on the DC was studied by experimental planning. The statistical tests used were three-way ANOVA, t-test, Tukey’s test, and Levene’s test, with a margin of error of 5%. Two groups prepared with post-pressing times of 12 h had the lowest DC (p
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