Polymerization shrinkage of microfilled composites determined by laser beam scanning.
Biomaterials
; 18(6): 467-70, 1997 Mar.
Article
em En
| MEDLINE
| ID: mdl-9111949
ABSTRACT
An He-Ne scanning laser beam was used to measure for the first time the linear shrinkage of light-cured microfilled composites. A low-power beam, which has a wavelength (632.8 nm) different from the polymerization wavelength (approximately 450 nm), was used. In these conditions no shrinkage is induced by the laser light. This method of measurement makes it possible to analyse small samples with a very low error (1.1 microns). Five different materials were tested using 10-20 mg specimens, and the shrinkage process was examined in detail over 2 days. All these materials showed shrinkage of more than 50% of their original length after 1 min of irradiation and approximately 99% of the total shrinkage occurred 4 h after irradiation.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Materiais Biocompatíveis
/
Resinas Compostas
/
Materiais Dentários
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
Biomaterials
Ano de publicação:
1997
Tipo de documento:
Article