FLEXURAL STRENGTH OF ACRYLIC RESINS POLYMERIZED BY DIFFERENT CYCLES

Despite the large number of studies addressing the effect of microwave polymerization on the properties of acrylic resin, this method has received limited clinical acceptance. This study evaluated the influence of microwave polymerization on the flexural strength of a denture base resin. A conventio...

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Main Authors:	Barbosa, Débora Barros, de Souza, Raphael Freitas, Pero, Ana Carolina, Marra, Juliê, Compagnoni, Marco Antonio
Format:	Online
Language:	English
Published:	Faculdade de Odontologia de Bauru da Universidade de São Paulo 2007
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4327264/

id	pubmed-4327264
recordtype	oai_dc
spelling	pubmed-43272642015-04-24 FLEXURAL STRENGTH OF ACRYLIC RESINS POLYMERIZED BY DIFFERENT CYCLES Barbosa, Débora Barros de Souza, Raphael Freitas Pero, Ana Carolina Marra, Juliê Compagnoni, Marco Antonio Original Article Despite the large number of studies addressing the effect of microwave polymerization on the properties of acrylic resin, this method has received limited clinical acceptance. This study evaluated the influence of microwave polymerization on the flexural strength of a denture base resin. A conventional heat-polymerized (Clássico), a microwave-polymerized (Onda-Cryl) and a autopolymerizing acrylic (Jet) resins were used. Five groups were established, according to polymerization cycles: A, B and C (Onda-Cryl, short cycle – 500W/3 min, long – 90W/13 min + 500W/90 sec, and manufacturing microwave cycle - 320W/ 3 min + 0W/3 min + 720W/3 min); T (Clássico, water bath cycle – 74°C/9h) and Q (Jet, press chamber cycle – 50°C/15 min at 2 bar). Ten specimens (65 x 10 x 3.3mm) were prepared for each cycle. The flexural strength of the five groups was measured using a three-point bending test at a cross-head speed of 5 mm/min. Flexural strength values were analyzed by one-way ANOVA and the Tukey's test was performed to identify the groups that were significantly different at 5% level. The microwave-polymerized groups showed the highest means (p<0.05) for flexural strength (MPa) (A = 106.97 ± 5.31; B = 107.57 ± 3.99; C = 109.63 ± 5.19), and there were no significant differences among them. The heat-polymerized group (T) showed the lowest flexural strength means (84.40 ± 1.68), and differ significantly from all groups. The specimens of a microwavable denture base resin could be polymerized by different microwave cycles without risk of decreasing the flexural strength. Faculdade de Odontologia de Bauru da Universidade de São Paulo 2007-10 /pmc/articles/PMC4327264/ /pubmed/19089173 http://dx.doi.org/10.1590/S1678-77572007000500010 Text en http://creativecommons.org/licenses/by-nc/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Barbosa, Débora Barros de Souza, Raphael Freitas Pero, Ana Carolina Marra, Juliê Compagnoni, Marco Antonio
spellingShingle	Barbosa, Débora Barros de Souza, Raphael Freitas Pero, Ana Carolina Marra, Juliê Compagnoni, Marco Antonio FLEXURAL STRENGTH OF ACRYLIC RESINS POLYMERIZED BY DIFFERENT CYCLES
author_facet	Barbosa, Débora Barros de Souza, Raphael Freitas Pero, Ana Carolina Marra, Juliê Compagnoni, Marco Antonio
author_sort	Barbosa, Débora Barros
title	FLEXURAL STRENGTH OF ACRYLIC RESINS POLYMERIZED BY DIFFERENT CYCLES
title_short	FLEXURAL STRENGTH OF ACRYLIC RESINS POLYMERIZED BY DIFFERENT CYCLES
title_full	FLEXURAL STRENGTH OF ACRYLIC RESINS POLYMERIZED BY DIFFERENT CYCLES
title_fullStr	FLEXURAL STRENGTH OF ACRYLIC RESINS POLYMERIZED BY DIFFERENT CYCLES
title_full_unstemmed	FLEXURAL STRENGTH OF ACRYLIC RESINS POLYMERIZED BY DIFFERENT CYCLES
title_sort	flexural strength of acrylic resins polymerized by different cycles
description	Despite the large number of studies addressing the effect of microwave polymerization on the properties of acrylic resin, this method has received limited clinical acceptance. This study evaluated the influence of microwave polymerization on the flexural strength of a denture base resin. A conventional heat-polymerized (Clássico), a microwave-polymerized (Onda-Cryl) and a autopolymerizing acrylic (Jet) resins were used. Five groups were established, according to polymerization cycles: A, B and C (Onda-Cryl, short cycle – 500W/3 min, long – 90W/13 min + 500W/90 sec, and manufacturing microwave cycle - 320W/ 3 min + 0W/3 min + 720W/3 min); T (Clássico, water bath cycle – 74°C/9h) and Q (Jet, press chamber cycle – 50°C/15 min at 2 bar). Ten specimens (65 x 10 x 3.3mm) were prepared for each cycle. The flexural strength of the five groups was measured using a three-point bending test at a cross-head speed of 5 mm/min. Flexural strength values were analyzed by one-way ANOVA and the Tukey's test was performed to identify the groups that were significantly different at 5% level. The microwave-polymerized groups showed the highest means (p<0.05) for flexural strength (MPa) (A = 106.97 ± 5.31; B = 107.57 ± 3.99; C = 109.63 ± 5.19), and there were no significant differences among them. The heat-polymerized group (T) showed the lowest flexural strength means (84.40 ± 1.68), and differ significantly from all groups. The specimens of a microwavable denture base resin could be polymerized by different microwave cycles without risk of decreasing the flexural strength.
publisher	Faculdade de Odontologia de Bauru da Universidade de São Paulo
publishDate	2007
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4327264/
_version_	1613187703763894272

FLEXURAL STRENGTH OF ACRYLIC RESINS POLYMERIZED BY DIFFERENT CYCLES

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