Effect of different light sources and reinforcement fibers on the hardness of dual resin cements activated through an indirect composite resin

Gabriela dos Santos Kummer, Marcos Kenzo Takahashi, Luci Regina Panka Archegas, Rodrigo Nunes Rached, Evelise Machado de Souza


Objective: The aim of this study was to determine the hardness of dual-cured resin cements irradiated with quartz-tungsten-halogen (QTH) or light-emitting diode (LED) curing units through a dental composite reinforced with different types of fibers. Material and methods: Discs made with a laboratory composite were used to simulate indirect restorations reinforced with unidirectional and bidirectional glass fibers and triaxial woven and biaxial braid ultra-high-molecular-weight polyethylene fiber ribbons. Specimens were made in a teflon mold with dual-cured resin cements (Bifix QM, RelyX ARC, RelyX Unicem, and Variolink II) and cured through a non-reinforced (control) or fiber-reinforced (Ribbond, Vectris, Fibrex-Lab, and Connect) composite discs with QTH or LED curing unit for 40 sec. The specimens were stored under 100% humidity at 37°C for 24 h. The microhardness Knoop test was carried out under a 50 g load for 15 sec, with five indentations per specimen. Data were analyzed with three-way analysis of variance (ANOVA) and Games-Howell test (p≤0.05). Results: Bifix QM showed significantly higher hardness values, despite the fiber type used in the composite reinforcement (p<0.05). Ribbond reinforcement resulted in significantly higher hardness of the resin cements, with the exception of RelyX Unicem. Resin cements activated by a LED curing unit showed statistically higher values of hardness. Conclusion: The triaxial woven polyethylene fiber reinforcement allowed better curing of most of the dual-cured resin cements. The use of a LED curing unit with higher irradiance increased the hardness of the resin cements evaluated in this study.


Fiber reinforcement; Hardness; Resin Cement; Light Curing Unit

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DOI: https://doi.org/10.7213/archivesoforalresearch.09.003.AO06


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