An alternative specimen preparation technique for 3-point bending tests on dual-cured dental resin cements

Authors

  • Ana Carla Assunção Oliveira Department of Dentistry, Federal University of Sergipe, Aracaju, SE, Brazil.
  • Christiane Marques Tavares Barreto Department of Dentistry, Federal University of Sergipe, Aracaju, SE, Brazil.
  • Luiz Alves Oliveira-Neto Department of Dentistry, Federal University of Sergipe, Aracaju, SE, Brazil.
  • Rafael Ratto Moraes Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil.
  • André Luis Faria-e-Silva Department of Dentistry, Federal University of Sergipe, Aracaju, SE, Brazil.

DOI:

https://doi.org/10.14393/BJ-v32n3a2016-31056

Keywords:

compressive strength, polymerization, resin cements

Abstract

The proper mechanical properties of resin cements are essential to the longevity of indirect restoration, whereas the 3-point bending test is recommended for measuring the flexural strength. The ISO 4049 specification requires light-curing of specimens in three consecutive points; however, this approach cannot be used for dual-cured resin cements. The aim of this study was to investigate the effect of two different specimen preparation techniques on the flexural strength and elastic modulus of experimental dual-cured resin cements immediately or 5 after minutes light curing. Experimental dual-cured resin cements were formulated, and the specimens of these cements were confectioned with the dimension of ISO 4049 specification. Light-activation was performed at one or three points immediately or 5 minutes after the insertion of cement into the matrix (n=7), resulting in four experimental conditions (2 methods × 2 moments of light-activation). The three-point bending test was performed and the values of the flexural strength and elastic modulus were recorded. Data were individually analyzed using 2-way ANOVA followed by the Tukey's post hoc test (P<0.05). Regardless of the points of light-activation, the specimens that were light-cured at 3 points showed the highest values of flexural strength. Only for light-activation at 1 point did the time before the light-activation affect the elastic modulus, whereas delayed light-activation had the highest values. In conclusion, the number of light-curing points on specimen preparation for the 3-point bending test seems to affect the mechanical properties of dual-cured resin cements. 

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Published

2016-06-01

How to Cite

OLIVEIRA, A.C.A., BARRETO, C.M.T., OLIVEIRA-NETO, L.A., MORAES, R.R. and FARIA-E-SILVA, A.L., 2016. An alternative specimen preparation technique for 3-point bending tests on dual-cured dental resin cements . Bioscience Journal [online], vol. 32, no. 3. [Accessed17 May 2022]. DOI 10.14393/BJ-v32n3a2016-31056. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/31056.

Issue

Section

Health Sciences