Restorative Dentistry and Endodontics

  • 제47권1호
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  • Pages.9.1-9.11
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  • 2022
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  • 2234-7658(pISSN)
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  • 2234-7666(eISSN)
대한치과보존학회 (The Korean Academy of Conservative Dentistry)
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Effects of 3 different light-curing units on the physico-mechanical properties of bleach-shade resin composites

  • Azin Farzad (Department of Restorative Dentistry, Faculty of Dentistry, Kashan University of Medical Sciences) ;
  • Shahin Kasraei (Department of Restorative Dentistry, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences) ;
  • Sahebeh Haghi (Department of Restorative Dentistry, Faculty of Dentistry, Arak University of Medical Sciences) ;
  • Mahboubeh Masoumbeigi (Department of Medical Physics and Biomedical Engineering, School of Medicine, Tehran University of Medical Sciences) ;
  • Hassan Torabzadeh (Dental Research Center, Research Institute of Dental Sciences, Dental School, Shahid Beheshti University of Medical Sciences) ;
  • Narges Panahandeh (Department of Restorative Dentistry, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences)
  • 투고 : 2020.12.26
  • 심사 : 2021.05.23
  • 발행 : 2022.02.28
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Objectives: This study investigated the microhardness, flexural strength, and color stability of bleach-shade resin composites cured with 3 different light-curing units. Materials and Methods: In this in vitro experimental study, 270 samples were fabricated of bleach and A2 shades of 3 commercial resin composites (Point 4, G-aenial Anterior, and Estelite Sigma Quick). Samples (n = 5 for each trial) were cured with Bluephase N, Woodpecker LED.D, and Optilux 501 units and underwent Vickers microhardness and flexural strength tests. The samples were tested after 24 hours of storage in distilled water. Color was assessed using a spectrophotometer immediately after preparation and 24 hours after curing. Data were analyzed using 3-way analysis of variance and the Tukey test (p ≤ 0.001). Results: Samples cured with Optilux exhibited the highest and those cured with LED.D exhibited the lowest microhardness (p = 0.023). The bleach shade of Point 4 composite cured with Optilux displayed the highest flexural strength, while the same composite and shade cured with Sigma Quick exhibited the lowest (p ≤ 0.001). The color change after 24 hours was greatest for the bleach shade of G-aenial cured with Bluephase N and least for the A2 shade of Sigma Quick cured with Optilux (p ≤ 0.001). Conclusions: Light curing with polywave light-emitting diode (LED) yielded results between or statistically similar to those of quartz-tungsten-halogen and monowave LED in the microhardness and flexural strength of both A2 and bleach shades of resin composites. However, the brands of light-curing devices showed significant differences in color stability.

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참고문헌

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