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.

Author Biography

Marcelo Giannini, Associate Professor, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil

Departamento de Odontoogia Restauradora - Área de Dentística

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Published

2012-06-15

Issue

Vol. 27 No. 2 (2012)

Section

Original Article

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