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A Journal on Dentistry and Maxillofacial Surgery
Minerva Stomatologica 2008 January-February;57(1-2):41-6
Influence of storage solution and curing me-thod on a microhybrid composite microhardness
Herbstrith Segundo R. M. 1, Gonçalves Mota E. 1, Balbinot C. E. 2, Lopes Bondan J. 2, Silva Oshima H. M. 2
1 Clinical Department Pontifical University of Rio Grande do Sul, Brazil
2 Department of Prosthodontics Pontifical University of Rio Grande do Sul, Brazil
Aim. The purpose of this study is to evaluate and compare the Vickers microhardness of one microhybrid composite polymerized with different sources and stored in different solutions for up to 14 days.
Methods. Using a bipartite PTFE mould with 6 mm inner diameter and 3 mm high, 30 samples were manufactured with Charisma B1 shade for each polymerization procedures (halogen light, LED and halogen light and postcure cycles) stored in tree types of storage solution.
Results. The postcuring method tended to improve the microhardness, but was not statistically different from halogen or LED curing methods (P>0.05). The storage solutions interfered in surface hardness, with the samples eluted in red wine showing the lowest hardness values (P<0.05). After seven days, the hardness values were higher than the first day, but statistically equal to 14 days (P<0.05).
Conclusion. On accordance with the findings of this study, different storage solutions can change the surface microhardness of a composite resin. An alcoholic solution seems most harmful to the composite. Samples postcured in autoclave had an improved mean value, however, without differing from those of the LED and halogen photo polymerized specimens.