Thermal-induced polymerization shrinkage in silorane versus methacrylate based resin composite

  • Wagner Baseggio Paranaense Univeristy
  • Flavia Pardo Salata Nahsan Federal University of Sergipe
  • Luciana Fávaro Francisconi-Dos-Rios University of São Paulo.
  • Marta Daniele Lima Menezes Alves Federal School of Dentistry of Sergipe.
  • Eduardo Batista Franco Bauru School of Dentistry, São Paulo University.
Keywords: Power density, Shrinkage, Silorane based resin.

Abstract

Shrinkage is a limitation of resin composite, compromising the clinical longevity of the restorative procedure. In an attempt to reduce their harmful effects, researchers have studied monomers with lower values of contraction. As a result, low-shrinkage composites were developed. This study evaluated quantitatively the shrinkage as a function of power density increase based on methacrylates, comparing them with silorane based resin, and qualitatively regarding gap formation between the adhesive interface as function of tooth substrate. Resin Filtek P90 and Filtek Z250 were polymerized with the device Blue Star 3 with 200, 400, 600, 800 and 1000 mW/cm2 keeping volume constant in 12 mm3. For qualitative analysis of restorative interface, class V cavity preparations in bovine incisors were restored in (2x2x2 mm3), photoactivated with the same values of irradiance, and analyzed by scanning electron microscopy at the interface of the wall surrounding enamel, dentin and axial. The quantitative results of the polymerization shrinkage were analyzed by two-way ANOVA and Tukey's test (p<0.05), while qualitative data were submitedd to Mann-Whitney's, Kruskal-Wallis' and Miller's tests. The progressive increase in power density directly influenced the polymerization shrinkage of the materials studied, although the silorane based resin demonstrated significantly lower values. The marginal integrity was influenced by the dental substrate and the power density used.

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Author Biographies

Wagner Baseggio, Paranaense Univeristy
Professor in Dentistry
Flavia Pardo Salata Nahsan, Federal University of Sergipe
Professor, Program in Dentistry
Luciana Fávaro Francisconi-Dos-Rios, University of São Paulo.


Professor, Department of Operative Dentistry School of Dentistry

Marta Daniele Lima Menezes Alves, Federal School of Dentistry of Sergipe.


Msc Student, Program in Dentistry

Eduardo Batista Franco, Bauru School of Dentistry, São Paulo University.

 

Professor,  Department of Operative Dentistry, Endodontics and Dental Materials. 

Published
2017-03-30
How to Cite
Baseggio, W., Nahsan, F. P. S., Francisconi-Dos-Rios, L. F., Alves, M. D. L. M., & Franco, E. B. (2017). Thermal-induced polymerization shrinkage in silorane versus methacrylate based resin composite . Bioscience Journal, 33(2). https://doi.org/10.14393/BJ-v33n2-35767
Section
Health Sciences