Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress
We compared polymerization stress in two commercial composites and three experimental composites made using camphorquinone (CQ) and/or phenylpropanedione (PPD) as photoinitiators. The internal surfaces of photoelastic resin discs with cylindrical cavities were roughened and treated with adhesive. Co...
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Sociedade Brasileira de Pesquisa Odontológica
2012-06-01
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Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-83242012000300004 |
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doaj-c9261fcb88a7461583747b5ef9872c752020-11-24T23:33:42ZengSociedade Brasileira de Pesquisa Odontológica Brazilian Oral Research1806-83242012-06-0126320220810.1590/S1806-83242012000300004Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stressKarla Mychellyne Costa OliveiraSimonides ConsaniLuciano Souza GonçalvesWilliam Cunha BrandtRenzo Alberto Ccahuana-VásquezWe compared polymerization stress in two commercial composites and three experimental composites made using camphorquinone (CQ) and/or phenylpropanedione (PPD) as photoinitiators. The internal surfaces of photoelastic resin discs with cylindrical cavities were roughened and treated with adhesive. Composites were divided into five groups: two commercial composites (Filtek Silorane and Filtek Z250) and three experimental composites with CQ/amine, CQ/PPD/amine, and PPD/amine. Composites were photopolymerized inside cavities, and subjected to photoelastic analysis immediately and at 24 hours and 7 days later using a plane polariscope. Stress created by Silorane (3.08 ± 0.09 MPa) was similar to that of Z250 (3.19 ± 0.13 MPa) immediately after photopolymerization (p > 0.05). After 24 hours and 7 days, Z250 (3.53 ± 0.15 and 3.69 ± 0.10 MPa, respectively) showed higher stress than Silorane (3.19 ± 0.10 and 3.16 ± 0.10 MPa, respectively). Qualitative analysis immediately after photopolymerization showed composite/CQ promoted higher stress than PPD, but stress levels at other evaluated times were statistically similar, varying between 3.45 ± 0.11 MPa and 3.92 ± 0.13 MPa. At 24 hours and 7 days, Silorane created the lowest stress. All photoinitiators created comparable tensions during polymerization.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-83242012000300004Composite ResinsPolymerizationPhotoinitiators, DentalDental Stress Analysis |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Karla Mychellyne Costa Oliveira Simonides Consani Luciano Souza Gonçalves William Cunha Brandt Renzo Alberto Ccahuana-Vásquez |
spellingShingle |
Karla Mychellyne Costa Oliveira Simonides Consani Luciano Souza Gonçalves William Cunha Brandt Renzo Alberto Ccahuana-Vásquez Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress Brazilian Oral Research Composite Resins Polymerization Photoinitiators, Dental Dental Stress Analysis |
author_facet |
Karla Mychellyne Costa Oliveira Simonides Consani Luciano Souza Gonçalves William Cunha Brandt Renzo Alberto Ccahuana-Vásquez |
author_sort |
Karla Mychellyne Costa Oliveira |
title |
Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress |
title_short |
Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress |
title_full |
Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress |
title_fullStr |
Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress |
title_full_unstemmed |
Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress |
title_sort |
photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress |
publisher |
Sociedade Brasileira de Pesquisa Odontológica |
series |
Brazilian Oral Research |
issn |
1806-8324 |
publishDate |
2012-06-01 |
description |
We compared polymerization stress in two commercial composites and three experimental composites made using camphorquinone (CQ) and/or phenylpropanedione (PPD) as photoinitiators. The internal surfaces of photoelastic resin discs with cylindrical cavities were roughened and treated with adhesive. Composites were divided into five groups: two commercial composites (Filtek Silorane and Filtek Z250) and three experimental composites with CQ/amine, CQ/PPD/amine, and PPD/amine. Composites were photopolymerized inside cavities, and subjected to photoelastic analysis immediately and at 24 hours and 7 days later using a plane polariscope. Stress created by Silorane (3.08 ± 0.09 MPa) was similar to that of Z250 (3.19 ± 0.13 MPa) immediately after photopolymerization (p > 0.05). After 24 hours and 7 days, Z250 (3.53 ± 0.15 and 3.69 ± 0.10 MPa, respectively) showed higher stress than Silorane (3.19 ± 0.10 and 3.16 ± 0.10 MPa, respectively). Qualitative analysis immediately after photopolymerization showed composite/CQ promoted higher stress than PPD, but stress levels at other evaluated times were statistically similar, varying between 3.45 ± 0.11 MPa and 3.92 ± 0.13 MPa. At 24 hours and 7 days, Silorane created the lowest stress. All photoinitiators created comparable tensions during polymerization. |
topic |
Composite Resins Polymerization Photoinitiators, Dental Dental Stress Analysis |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-83242012000300004 |
work_keys_str_mv |
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