Flexural strength of a composite resin light cured with different exposure modes and immersed in ethanol or distilled water media.
J Conserv Dent
; 15(4): 333-6, 2012 Oct.
Article
em En
| MEDLINE
| ID: mdl-23112479
ABSTRACT
AIM:
The aim of this in vitro study was to evaluate the flexural strength of a composite resin polymerized with three different modes of light exposure. MATERIALS ANDMETHODS:
The three different modes of light exposure were conventional, 600 mW/cm2/40s; soft start, 300 mW/cm2/10s + 600 mW/cm2/30s; pulse delay, 600 mW/cm2/1s + 60 s of waiting time + 600 mW/cm2/39s). Twenty samples were prepared for each polymerization method. Flexural strength (FS) tests were carried out with a 2 kN load at a speed of 0.5 mm/ min. All tested groups were submitted to analysis of variance (one-way-ANOVA) and Tukey's test (P < 0.05).RESULTS:
When stored in water, conventional and pulse delay groups presented higher FS values which were statistically different from the soft start group. When stored in 100% ethanol, conventional and soft start groups presented higher FS values which were statistically different from the pulse delay group.CONCLUSION:
Different polymerization modes and immersion media can affect the physical properties (flexural strength) of composite resin.
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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article