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Effect of Pressure, Post-Pressing Time, and Polymerization Cycle on the Degree of Conversion of Thermoactivated Acrylic Resin
Joint Authors
Leão, Rafaella de S.
Moraes, Sandra L. D. de
Aquino, Kátia A. da S.
Isolan, Cristina P.
Casado, Bruno G. da S.
Montes, Marcos A. J. R.
Source
International Journal of Dentistry
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-6, 6 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-08-15
Country of Publication
Egypt
No. of Pages
6
Main Subjects
Abstract EN
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.
American Psychological Association (APA)
Leão, Rafaella de S.& Moraes, Sandra L. D. de& Aquino, Kátia A. da S.& Isolan, Cristina P.& Casado, Bruno G. da S.& Montes, Marcos A. J. R.. 2018. Effect of Pressure, Post-Pressing Time, and Polymerization Cycle on the Degree of Conversion of Thermoactivated Acrylic Resin. International Journal of Dentistry،Vol. 2018, no. 2018, pp.1-6.
https://search.emarefa.net/detail/BIM-1170566
Modern Language Association (MLA)
Leão, Rafaella de S.…[et al.]. Effect of Pressure, Post-Pressing Time, and Polymerization Cycle on the Degree of Conversion of Thermoactivated Acrylic Resin. International Journal of Dentistry No. 2018 (2018), pp.1-6.
https://search.emarefa.net/detail/BIM-1170566
American Medical Association (AMA)
Leão, Rafaella de S.& Moraes, Sandra L. D. de& Aquino, Kátia A. da S.& Isolan, Cristina P.& Casado, Bruno G. da S.& Montes, Marcos A. J. R.. Effect of Pressure, Post-Pressing Time, and Polymerization Cycle on the Degree of Conversion of Thermoactivated Acrylic Resin. International Journal of Dentistry. 2018. Vol. 2018, no. 2018, pp.1-6.
https://search.emarefa.net/detail/BIM-1170566
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1170566