Effects of radiant exposure and wavelength spectrum of light-curing units on chemical and physical properties of resin cements
Lima Adriano Fonseca, Formaggio Stephanie Ellen Ferreira, Zambelli Ligia Franca Aires, Palialol Alan Rodrigo Muniz, Marchi Giselle Maria, Saraceni Cintia Helena Coury, de Oliveira Marcelo Tavares,
소속 상세정보
( Lima Adriano Fonseca ) - Paulista University School of Dentistry Dental Research Division
( Formaggio Stephanie Ellen Ferreira ) - Nove de Julho University
( Zambelli Ligia Franca Aires ) - Nove de Julho University
( Palialol Alan Rodrigo Muniz ) - University of Campinas Piracicaba Dental School Department of Restorative Dentistry
( Marchi Giselle Maria ) - University of Campinas Piracicaba Dental School Department of Restorative Dentistry
( Saraceni Cintia Helena Coury ) - Paulista University School of Dentistry Dental Research Division
( de Oliveira Marcelo Tavares ) - Nove de Julho University Department of Restorative Dentistry
KMID : 1034420160410040271
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.
키워드
Degree of conversion; Light-curing unit; Mechanical properties; Resin cements
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