Effect of Pressure, Post-Pressing Time, and Polymerization Cycle on the Degree of Conversion of Thermoactivated Acrylic Resin
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 perform...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | International Journal of Dentistry |
| Online Access: | http://dx.doi.org/10.1155/2018/5743840 |
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| author | 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 |
| author_facet | 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 |
| author_sort | Rafaella de S. Leão |
| collection | DOAJ |
| description | 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<0.001). Post-pressing times of 0 and 6 h did not yield statistically different results. Pressure increased the DC in only one group (long cycle +12 h, p=0.001). The short cycle resulted in a higher DC than the long cycle in 2 groups (with pressure +0 h, p=0.002; without pressure +6 h, p=0.015), while the long cycle yielded a statistically higher DC in only one group (with pressure +12 h, p<0.001). The polymerization showed satisfactory DC in all 12 groups. Small differences found among the specimens indicate that the pressure, post-pressing time, and polymerization cycles herein were not influential factors for the DC of PMMA. |
| format | Article |
| id | doaj-art-7e8be5b6f52f422ba8c234e7ae9a8329 |
| institution | Kabale University |
| issn | 1687-8728 1687-8736 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Dentistry |
| spelling | doaj-art-7e8be5b6f52f422ba8c234e7ae9a83292025-02-03T06:05:56ZengWileyInternational Journal of Dentistry1687-87281687-87362018-01-01201810.1155/2018/57438405743840Effect of Pressure, Post-Pressing Time, and Polymerization Cycle on the Degree of Conversion of Thermoactivated Acrylic ResinRafaella de S. Leão0Sandra L. D. de Moraes1Kátia A. da S. Aquino2Cristina P. Isolan3Bruno G. da S. Casado4Marcos A. J. R. Montes5Department of Restorative Dentistry, Faculty of Dentistry, University of Pernambuco-FOP/UPE, Av. Gal. Newton Cavalcanti 1650, 54753-020 Camaragibe, PE, BrazilDepartment of Prosthodontics, Faculty of Dentistry, University of Pernambuco-FOP/UPE, Av. Gal. Newton Cavalcanti 1650, 54753-020 Camaragibe, PE, BrazilDepartment of Nuclear Engineering, Federal University of Pernambuco (UFPE), Av. Prof. Moraes Rego, 1235-Cidade Universitária, 50670-901 Recife, PE, BrazilDepartment of Restorative Dentistry, Faculty of Dentistry, Federal University of Pelotas (UFPel), R. Gonçalves Chaves, 457-Centro, 96015-560 Pelotas, RS, BrazilDepartment of Restorative Dentistry, Faculty of Dentistry, University of Pernambuco-FOP/UPE, Av. Gal. Newton Cavalcanti 1650, 54753-020 Camaragibe, PE, BrazilDepartment of Restorative Dentistry, Faculty of Dentistry, University of Pernambuco-FOP/UPE, Av. Gal. Newton Cavalcanti 1650, 54753-020 Camaragibe, PE, BrazilHerein, 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<0.001). Post-pressing times of 0 and 6 h did not yield statistically different results. Pressure increased the DC in only one group (long cycle +12 h, p=0.001). The short cycle resulted in a higher DC than the long cycle in 2 groups (with pressure +0 h, p=0.002; without pressure +6 h, p=0.015), while the long cycle yielded a statistically higher DC in only one group (with pressure +12 h, p<0.001). The polymerization showed satisfactory DC in all 12 groups. Small differences found among the specimens indicate that the pressure, post-pressing time, and polymerization cycles herein were not influential factors for the DC of PMMA.http://dx.doi.org/10.1155/2018/5743840 |
| spellingShingle | 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 Effect of Pressure, Post-Pressing Time, and Polymerization Cycle on the Degree of Conversion of Thermoactivated Acrylic Resin International Journal of Dentistry |
| title | Effect of Pressure, Post-Pressing Time, and Polymerization Cycle on the Degree of Conversion of Thermoactivated Acrylic Resin |
| title_full | Effect of Pressure, Post-Pressing Time, and Polymerization Cycle on the Degree of Conversion of Thermoactivated Acrylic Resin |
| title_fullStr | Effect of Pressure, Post-Pressing Time, and Polymerization Cycle on the Degree of Conversion of Thermoactivated Acrylic Resin |
| title_full_unstemmed | Effect of Pressure, Post-Pressing Time, and Polymerization Cycle on the Degree of Conversion of Thermoactivated Acrylic Resin |
| title_short | Effect of Pressure, Post-Pressing Time, and Polymerization Cycle on the Degree of Conversion of Thermoactivated Acrylic Resin |
| title_sort | effect of pressure post pressing time and polymerization cycle on the degree of conversion of thermoactivated acrylic resin |
| url | http://dx.doi.org/10.1155/2018/5743840 |
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