The effect of viscosity and activation mode on biaxial flexure strength and modulus of dual resin cements

Authors

  • Marina Di Francescantonio Graduate Student, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil
  • Frederick Allen Rueggeberg Professor and Section Director, Department of Oral Rehabilitation, School of Dentistry, Georgia Health Sciences University, Augusta, GA, USA
  • César Augusto Galvão Arrais Associate Professor, Department of Operative Dentistry, School of Dentistry, University of Guarulhos, Guarulhos, SP, Brazil
  • Glaucia Maria Bovi Ambrosano Chair and Professor, Department of Social Dentistry, Piracicaba School of Dentistry, Campinas State University, Piracicaba, SP, Brazil
  • Marcelo Giannini Associate Professor, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil

Keywords:

Dual cure resin cement, materials testing, viscosity

Abstract

Purpose: The aim of this study was to evaluate the effects of curing mode and viscosity on the biaxial flexural strength (FS) and modulus (FM) of dual resin cements. Methods: Eight experimental groups were created (n = 12) according to the dual-cured resin cements (Nexus 2/Kerr Corp. and Variolink II/IvoclarVivadent), curing modes (dual or self-cure), and viscosities (low and high). Forty-eight cement discs of each product (0.5 mm thick by 6.0 mm diameter) were fabricated. Half specimens were light - activated for 40 seconds and half were allowed to self-cure. After 10 days, the biaxial flexure test was performed using a universal testing machine (1.27 mm/min, Instron 5844). Data were statistically analyzed by three-way ANOVA and Tukey's test (5%). Results: Light-activation increased FS and FM of resin cements at both viscosities in comparison with self-curing mode. The high viscosity version of light-activated resin cements exhibited higher FS than low viscosity versions. The viscosity of resin and the type of cement did not influence the FM. Light-activation of dual-polymerizing resin cements provided higher FS and FM for both resin cements and viscosities. Conclusion: The use of different resin cements with different viscosities may change the biomechanical behavior of these luting materials.

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Published

2012-06-15

Issue

Vol. 27 No. 2 (2012)

Section

Original Article

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