Restor Dent Endod.  2016 Nov;41(4):271-277. 10.5395/rde.2016.41.4.271.

Effects of radiant exposure and wavelength spectrum of light-curing units on chemical and physical properties of resin cements

• Lima AF
• Formaggio
• Zambelli L
• Palialol A
• Marchi GM
• Saraceni C
• de Oliveira MT

• KMID: 2356003
• DOI: http://doi.org/10.5395/rde.2016.41.4.271

Abstract

OBJECTIVES
In this study, we evaluated the influence of different radiant exposures provided by single-peak and polywave light-curing units (LCUs) on the degree of conversion (DC) and the mechanical properties of resin cements.
MATERIALS AND METHODS
Six experimental groups were established for each cement (RelyX ARC, 3M ESPE; LuxaCore Dual, Ivoclar Vivadent; Variolink, DMG), according to the different radiant exposures (5, 10, and 20 J/cm²) and two LCUs (single-peak and polywave). The specimens were made (7 mm in length × 2 mm in width × 1 mm in height) using silicone molds. After 24 hours of preparation, DC measurement was performed using Fourier transform infrared spectrometry. The same specimens were used for the evaluation of mechanical properties (flexural strength, FS; elastic modulus, E) by a three-point bending test. Data were assessed for normality, after which two-way analysis of variance (ANOVA) and post hoc Tukey's test were performed.
RESULTS
No properties of the Variolink cement were influenced by any of the considered experimental conditions. In the case of the RelyX ARC cement, DC was higher when polywave LCU was used; FS and E were not influenced by the conditions evaluated. The LuxaCore cement showed greater sensitivity to the different protocols.
CONCLUSIONS
On the basis of these results, both the spectrum of light emitted and the radiant exposure used could affect the properties of resin cements. However, the influence was material-dependent.

Keyword

Degree of conversion; Light-curing unit; Mechanical properties; Resin cements

MeSH Terms

Elastic Modulus
Fourier Analysis
Fungi
Resin Cements*
Silicon
Silicones
Spectrum Analysis
Resin Cements
Silicon
Silicones

Figure

• 

  Figure 1 Distribution of wavelengths emitted by the two light-emitting diode sources evaluated in the present study.

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  Figure 2 Elastic modulus (E, GPa) of the specimens, according to the experimental groups. Capital letters and lines indicate the difference between the light-curing units irrespective of the radiant exposure used (two-way analysis of variance [ANOVA] and Tukey's test, α = 0.05). Distinct letters indicate the statistically significant differences. *The resin cements were not compared.

• 

  Figure 3 Flexural strength (MPa) of the specimens, in accordance with the light-curing unit and the energy density evaluated. Capital letters and lines indicate the difference between the light-curing units irrespective of the radiant exposure used (two-way analysis of variance [ANOVA] and Tukey's test, α = 0.05). Distinct letters indicate the statistically significant differences. *The resin cements were not compared.

• 

  Figure 4 Degree of conversion (%) of the specimens, according to the light-curing unit and the energy density evaluated. Capital letters and lines indicate the difference between the light-curing units irrespective of the radiant exposure used (two-way analysis of variance [ANOVA] and Tukey's test, α = 0.05). Lower-case letters compare the radiant exposures. Distinct letters indicate the statistically significant differences. *The resin cements were not compared.

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