Photoelastic evaluation of the effect of composite formulation on polymerization shrinkage stress
Braz. oral res
;
26(3): 202-208, May-June 2012. ilus, tab
Artigo
em Inglês
| LILACS
| ID: lil-622934
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.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Cânfora
/
Resinas Compostas
/
Fotoiniciadores Dentários
/
Polimerização
Tipo de estudo:
Estudos de avaliação
/
Pesquisa qualitativa
Limite:
Humanos
Idioma:
Inglês
Revista:
Braz. oral res
Assunto da revista:
Odontologia
Ano de publicação:
2012
Tipo de documento:
Artigo
País de afiliação:
Brasil
/
Estados Unidos
Instituição/País de afiliação:
State University of Campinas/BR
/
University of Taubaté/BR
/
University of Texas Health Science Center/US
/
University of Uberaba/BR
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