Journal of Conservative Dentistry
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Year : 2012  |  Volume : 15  |  Issue : 4  |  Page : 333-336

Flexural strength of a composite resin light cured with different exposure modes and immersed in ethanol or distilled water media

1 Department of Restorative Dentistry, Dental School of Três Corações, Vale do Rio Verde University, UNINCOR, Três Corações, Brazil
2 Department of Dentistry, Federal University of Vales do Jequitinhonha e Mucuri, UFVJM, Diamantina, MG, Brazil

Correspondence Address:
Marcos Ribeiro Moysés
Departament of Restorative Dentistry, UNINCOR, Campus Três Corações, Av. Castelo Branco, 82 - Chácara das Rosas, Três Corações- Minas Gerais, CEP: 37410-000
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Source of Support: This in vitro study was partially supported by Foundation of Support to Research of the State of Minas Gerais (FAPEMIG), Conflict of Interest: None

DOI: 10.4103/0972-0707.101891

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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.

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