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metadata.dc.type: | Artigo de Periódico |
Title: | Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress |
Authors: | Oliveira, Karla Mychellyne Costa Consani, Simonides Gonçalves, Luciano Souza Brandt, William Cunha Ccahuana-Vásquez, Renzo Alberto |
Abstract: | 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. |
metadata.dc.language: | Inglês |
metadata.dc.publisher.country: | Brasil |
Publisher: | Sociedade Brasileira de Pesquisa Odontológica - SBPqO |
metadata.dc.rights: | Acesso Aberto |
metadata.dc.rights.uri: | https://creativecommons.org/licenses/by-nc-nd/4.0 |
metadata.dc.identifier.doi: | 10.1590/S1806-83242012000300004 |
URI: | http://repositorio.unitau.br/jspui/handle/20.500.11874/1823 |
Issue Date: | 2012 |
Appears in Collections: | Artigos de Periódicos |
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