Composite depth of cure using four polymerization techniques
J. appl. oral sci
; 17(5): 446-450, Sept.-Oct. 2009. ilus, tab
Artigo
em Inglês
| LILACS
| ID: lil-531395
Biblioteca responsável:
BR1.1
ABSTRACT
The light-curing technique is relevant to reduce the degree of polymerization shrinkage, improving clinical and esthetic success of composite resin restorations. OBJECTIVE:
To evaluate in vitro the effect of four light-curing techniques on depth of cure of a composite resin. MATERIAL ANDMETHODS:
Ten specimens of a composite resin were made in cylindrical cavities prepared in PVC plates (3.0 X 7.0 mm) for each light-curing technique. Four photoactivation methods were investigated stepped, ramped, pulse-delay and traditional. Specimens were longitudinally sectioned and polished for microhardness measurements (kg/mm²), which were made at 0.1, 1.0, 2.0 and 4.0 mm from the irradiated surface. Data were subjected to ANOVA and Tukey's test.RESULTS:
The effect of factors studied (curing method and distance from the surface) and the interaction of these factors was statistically significant (p<0.05). The traditional method of cure provided higher microhardness values (69.6 ± 2.5) than the stepped (63.5 ± 3.1) and pulsed (63.9 ± 3.2) methods at all depths evaluated, but it did not differ from the ramped method (66.7± 4.4) at 0.1 and 1.0 mm of depth.CONCLUSION:
All techniques employed provided satisfactory cure of the composite resin up to the depth of 2.0 mm from the irradiated surface.
Texto completo:
Disponível
Coleções:
Bases de dados internacionais
Base de dados:
LILACS
Assunto principal:
Resinas Compostas
/
Materiais Dentários
Limite:
Humanos
Idioma:
Inglês
Revista:
J. appl. oral sci
Assunto da revista:
Odontologia
Ano de publicação:
2009
Tipo de documento:
Artigo
/
Documento de projeto
País de afiliação:
Brasil
Instituição/País de afiliação:
University of Campinas/BR
/
University of Maringa/BR
/
University of São Paulo/BR