• Comparación in vitro del efecto del tipo de luz led de tercera generación (Valo® - Ultradent©) vs. Luz led de segunda generación (Elipar™ - 3M Espe™) en la resistencia de unión del cemento Relyx® U200 al cerómero SR Adoro® - Ivoclar Vivadent®

      Casas Apayco, Leslie Caroll; Cafferata Montoya, Paola Antonella; Araujo Herrera, Nicoll Antuanette; Behrens Peñaloza, Sebastian (Universidad Peruana de Ciencias Aplicadas (UPC), 2018-01-30)
      Purpose: Make an in vitro comparison of the effect of using a second- and third-generation LED curing light on the bond strength of an indirect resin composite to dental enamel cemented with a self-adhesive resin cement. Materials and methods: 44 SR ADORO® indirect resin composite blocks were cemented on 44 bovine incisors using two LED curing lights: ELIPAR™ - 3M ESPE™ (second-generation, 1150 mW/cm2) and VALO® - ULTRADENT© (third-generation - 1400 mW/cm2) and a self-adhesive resin cement (RELYX® U200). The dental curing units’ light intensities were previously measured with a radiometer (Monitex; DigiRate LM 100 - China). The samples were randomly divided into two groups (n=22): Group 1: polymerization was done using the VALO® - ULTRADENT© dental curing unit, group 2: polymerization was done using the ELIPAR™ - 3M ESPE™ dental curing unit. The indirect resin composite blocks were made in a 4mm x 6mm matrix. The cementation of the indirect composite blocks was done with slight vertical pressure on the center of the buccal surface of the tooth and removing the excess resin cement with a microbrush. The curing light was applied for 20 seconds on four sides of the sample. The shear bond strength test was performed in a universal testing machine (3382 INSTRON®-U.S.A). The results of each group were compared using the Mann-Whitney U test. Results: Group 1 (VALO® - ULTRADENT©) resulted in an average bond strength of 5.84 MPa +-2.04, while group 2 (ELIPAR™ - 3M ESPE™) showed an average of 4.16 MPa +-1.25. Statistically significant differences were found (p= 0.0045). Conclusion: Third-generation LED curing lights generate a higher bond strength compared to second-generation curing lights when used to cement indirect resin composites with self-adhesive resin cements.
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