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Flexural strength of a composite resin light cured with different exposure modes and immersed in ethanol or distilled
Saulo Galvão Dos Santos1, Marcos Ribeiro Moysés, Carlos Eduardo Pinto Alcântara
1Department of Restorative Dentistry, Dental School of Três Corações, Vale do Rio Verde University, UNINCOR, Três Corações, Brazil.
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 And Methods:
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.
