Polymerization time for a microwave-cured acrylic resin with multiple flasks
This study aimed at establishing the polymerization time of a microwave-cured acrylic resin (AcronTM MC), simultaneously processing 2, 4, and 6 flasks. Required time was measured according to the parameters: monomer release in water, Knoop hardness, and porosity. Samples were made with AcronTM MC in different shapes: rectangular (32 x 10 x 2.5 mm) for monomer release and porosity; and half-disc (30 mm in diameter x 4 mm in height) for Knoop hardness. There were four experimental groups (n = 24 per group): G1) one flask (control); G2) two flasks; G3) four flasks, and G4) six flasks. At first, polymerization protocol was similar for all groups (3 min/450 W). Time was then adjusted for G2, G3, and G4, based on monomer release evaluation in the control group, obtained by spectrophotometer Beckman DU-70, with emitting wave of 206 nm. Knoop hardness test was performed using a Shimadzu HMV 2000 hardness tester, and 10 indentations were performed on each specimen's surface. Porosity was assessed after specimens were immersed in black ink and the pores counted in a microscope. Results showed that the complete polymerization of the resin occurred in 4.5 min for two flasks (G2); 8.5 min for four flasks (G3); and 13 min for six flasks (G4), all with 450 W. Statistical analysis revealed that the number of flasks does not interfere with polymerization, Knoop hardness, and porosity of the resin. Results showed that polymerization of microwave-curing resin with more than one flask is a viable procedure, as long as polymerization time is adjusted.
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Sociedade Brasileira de Pesquisa Odontológica - SBPqO
2004
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oai:scielo:S1806-832420040001000052004-09-29Polymerization time for a microwave-cured acrylic resin with multiple flasksBotega,Daniela MaffeiMachado,Tatiana de SouzaMello,José Antônio Nunes deGarcia,Renata Cunha Matheus RodriguesDel Bel Cury,Altair Antoninha Acrylic resins Microwaves Polymers Porosity This study aimed at establishing the polymerization time of a microwave-cured acrylic resin (AcronTM MC), simultaneously processing 2, 4, and 6 flasks. Required time was measured according to the parameters: monomer release in water, Knoop hardness, and porosity. Samples were made with AcronTM MC in different shapes: rectangular (32 x 10 x 2.5 mm) for monomer release and porosity; and half-disc (30 mm in diameter x 4 mm in height) for Knoop hardness. There were four experimental groups (n = 24 per group): G1) one flask (control); G2) two flasks; G3) four flasks, and G4) six flasks. At first, polymerization protocol was similar for all groups (3 min/450 W). Time was then adjusted for G2, G3, and G4, based on monomer release evaluation in the control group, obtained by spectrophotometer Beckman DU-70, with emitting wave of 206 nm. Knoop hardness test was performed using a Shimadzu HMV 2000 hardness tester, and 10 indentations were performed on each specimen's surface. Porosity was assessed after specimens were immersed in black ink and the pores counted in a microscope. Results showed that the complete polymerization of the resin occurred in 4.5 min for two flasks (G2); 8.5 min for four flasks (G3); and 13 min for six flasks (G4), all with 450 W. Statistical analysis revealed that the number of flasks does not interfere with polymerization, Knoop hardness, and porosity of the resin. Results showed that polymerization of microwave-curing resin with more than one flask is a viable procedure, as long as polymerization time is adjusted.info:eu-repo/semantics/openAccessSociedade Brasileira de Pesquisa Odontológica - SBPqOBrazilian Oral Research v.18 n.1 20042004-03-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1806-83242004000100005en10.1590/S1806-83242004000100005 |
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Botega,Daniela Maffei Machado,Tatiana de Souza Mello,José Antônio Nunes de Garcia,Renata Cunha Matheus Rodrigues Del Bel Cury,Altair Antoninha |
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Botega,Daniela Maffei Machado,Tatiana de Souza Mello,José Antônio Nunes de Garcia,Renata Cunha Matheus Rodrigues Del Bel Cury,Altair Antoninha Polymerization time for a microwave-cured acrylic resin with multiple flasks |
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Botega,Daniela Maffei Machado,Tatiana de Souza Mello,José Antônio Nunes de Garcia,Renata Cunha Matheus Rodrigues Del Bel Cury,Altair Antoninha |
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Botega,Daniela Maffei |
title |
Polymerization time for a microwave-cured acrylic resin with multiple flasks |
title_short |
Polymerization time for a microwave-cured acrylic resin with multiple flasks |
title_full |
Polymerization time for a microwave-cured acrylic resin with multiple flasks |
title_fullStr |
Polymerization time for a microwave-cured acrylic resin with multiple flasks |
title_full_unstemmed |
Polymerization time for a microwave-cured acrylic resin with multiple flasks |
title_sort |
polymerization time for a microwave-cured acrylic resin with multiple flasks |
description |
This study aimed at establishing the polymerization time of a microwave-cured acrylic resin (AcronTM MC), simultaneously processing 2, 4, and 6 flasks. Required time was measured according to the parameters: monomer release in water, Knoop hardness, and porosity. Samples were made with AcronTM MC in different shapes: rectangular (32 x 10 x 2.5 mm) for monomer release and porosity; and half-disc (30 mm in diameter x 4 mm in height) for Knoop hardness. There were four experimental groups (n = 24 per group): G1) one flask (control); G2) two flasks; G3) four flasks, and G4) six flasks. At first, polymerization protocol was similar for all groups (3 min/450 W). Time was then adjusted for G2, G3, and G4, based on monomer release evaluation in the control group, obtained by spectrophotometer Beckman DU-70, with emitting wave of 206 nm. Knoop hardness test was performed using a Shimadzu HMV 2000 hardness tester, and 10 indentations were performed on each specimen's surface. Porosity was assessed after specimens were immersed in black ink and the pores counted in a microscope. Results showed that the complete polymerization of the resin occurred in 4.5 min for two flasks (G2); 8.5 min for four flasks (G3); and 13 min for six flasks (G4), all with 450 W. Statistical analysis revealed that the number of flasks does not interfere with polymerization, Knoop hardness, and porosity of the resin. Results showed that polymerization of microwave-curing resin with more than one flask is a viable procedure, as long as polymerization time is adjusted. |
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Sociedade Brasileira de Pesquisa Odontológica - SBPqO |
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2004 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1806-83242004000100005 |
work_keys_str_mv |
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