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Influence of the light-curing unit, storage time and shade of a dental composite resin on the fluorescence

Queiroz, R. ; Bandéca, M. ; Calixto, L. ; Gaiao, U. ; Cuin, A. ; Porto-Neto, S.

Laser Physics, 2010, Vol.20(7), pp.1647-1653 [Periódico revisado por pares]

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  • Título:
    Influence of the light-curing unit, storage time and shade of a dental composite resin on the fluorescence
  • Autor: Queiroz, R. ; Bandéca, M. ; Calixto, L. ; Gaiao, U. ; Cuin, A. ; Porto-Neto, S.
  • Assuntos: Physics ; Laser Technology, Photonics ; Physics
  • É parte de: Laser Physics, 2010, Vol.20(7), pp.1647-1653
  • Descrição: The aim of this study was to determine the influence of three light-curing units, storage times and colors of the dental composite resin on the fluorescence. The specimens (diameter 10.0 ± 0.1 mm, thickness 1.0 ± 0.1 mm) were made using a stainless steel mold. The mold was filled with the microhybrid composite resin and a polyethylene film covered each side of the mold. After this, a glass slide was placed on the top of the mold. To standardize the top surface of the specimens a circular weight (1 kg) with an orifice to pass the light tip of the LCU was placed on the top surface and photo-activated during 40 s. Five specimens were made for each group. The groups were divided into 9 groups following the LCUs (one QTH and two LEDs), storage times (immediately after curing, 24 hours, 7 and 30 days) and colors (shades: A 2 E, A 2 D, and TC) of the composite resin. After photo-activation, the specimens were storage in artificial saliva during the storage times proposed to each group at 37°C and 100% humidity. The analysis of variance (ANOVA) and Tukey’s posthoc tests showed no significant difference between storage times (immediately, 24 hours and 30 days) ( P > 0.05). The means of fluorescence had difference significant to color and light-curing unit used to all period of storage ( P < 0.05). The colors had difference significant between them (shades: A 2 D < A 2 E < TC) ( P < 0.05). The Ultraled (LED) and Ultralux (QTH) when used the TC shade showed higher than Radii (LED), however to A 2 E shade and A 2 D shade any difference were found ( P > 0.05).
  • Idioma: Inglês

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