| ORIGINAL ARTICLE |
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| Year : 2012 | Volume
: 15
| Issue : 4 | Page : 333-336 |
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Flexural strength of a composite resin light cured with different exposure modes and immersed in ethanol or distilled water media
Saulo Galvão dos Santos1, Marcos Ribeiro Moysés1, Carlos Eduardo Pinto Alcântara2, José Carlos Rabelo Ribeiro1, João Gustavo Rabelo Ribeiro1
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
Brazil
 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  | Check |
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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