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  • Research Article
    Light transmittance of CAD/CAM ceramics with different shades and thicknesses and microhardness of the underlying light-cured resin cement
    Zahra Jafari, Homayoon Alaghehmand, Yasaman Samani, Mina Mahdian, Soraya Khafri
    Restor Dent Endod 2018;43(3):e27.   Published online June 4, 2018
    DOI: https://doi.org/10.5395/rde.2018.43.e27
    AbstractAbstract PDFPubReaderePub
    Objectives

    The aim of this in vitro study was to evaluate the effects of the thickness and shade of 3 types of computer-aided design/computer-aided manufacturing (CAD/CAM) materials.

    Materials and Methods

    A total of 120 specimens of 2 shades (A1 and A3) and 2 thicknesses (1 and 2 mm) were fabricated using VITA Mark II (VM; VITA Zahnfabrik), IPS e.max CAD (IE; IvoclarVivadent), and VITA Suprinity (VS; VITA Zahnfabrik) (n = 10 per subgroup). The amount of light transmission through the ceramic specimens was measured by a radiometer (Optilux, Kerr). Light-cured resin cement samples (Choice 2, Bisco) were fabricated in a Teflon mold and activated through the various ceramics with different shades and thicknesses using an LED unit (Bluephase, IvoclarVivadent). In the control group, the resin cement sample was directly light-cured without any ceramic. Vickers microhardness indentations were made on the resin surfaces (KoopaPazhoohesh) after 24 hours of dark storage in a 37°C incubator. Data were analyzed using analysis of variance followed by the Tukey post hoc test (α = 0.05).

    Results

    Ceramic thickness and shade had significant effects on light transmission and the microhardness of all specimens (p < 0.05). The mean values of light transmittance and microhardness of the resin cement in the VM group were significantly higher than those observed in the IE and VS groups. The lowest microhardness was observed in the VS group, due to the lowest level of light transmission (p < 0.05).

    Conclusion

    Greater thickness and darker shades of the 3 types of CAD/CAM ceramics significantly decreased the microhardness of the underlying resin cement.

    Citations

    Citations to this article as recorded by  
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    • Light Polymerization through Glass-ceramics: Influence of Light-polymerizing Unit’s Emitted Power and Restoration Parameters (Shade, Translucency, and Thickness) on Transmitted Radiant Power
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      Dental Research Journal.2024;[Epub]     CrossRef
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      Eduardo Fernandes de Castro, Bruna Marin Fronza, Jorge Soto‐Montero, Marcelo Giannini, Carlos Tadeu dos‐Santos‐Dias, Richard Bengt Price
      Journal of Esthetic and Restorative Dentistry.2023; 35(2): 368.     CrossRef
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      Kejing Meng, Lu Wang, Jintao Wang, Zhuoqun Yan, Bin Zhao, Bing Li
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      Yener Okutan, Banucicek Kandemir, Mustafa Borga Donmez, Munir Tolga Yucel
      European Journal of Oral Sciences.2022;[Epub]     CrossRef
    • Influence of inhomogeneity of the polymerization light beam on the microhardness of resin cement under a CAD-CAM block
      Yu-Ra Go, Kwang-Man Kim, Sung-Ho Park
      The Journal of Prosthetic Dentistry.2022; 127(5): 802.e1.     CrossRef
    • Evaluation of microhardness and water sorption/solubility of dual-cure resin cement through monolithic zirconia in different shades
      Elham Ansarifard, Zahra Panbehzan, Rashin Giti
      The Journal of Indian Prosthodontic Society.2021; 21(1): 50.     CrossRef
    • Comparison between Different Shades of Monolithic Zirconia over Microhardness and Water Solubility and Sorption of Dual-cure Resin Cement
      Sarika Sharma, Soni Kumari, Nikita Raman, Ashish K Srivastava, Gunja LNU, Arunendra S Chauhan
      The Journal of Contemporary Dental Practice.2021; 22(9): 1019.     CrossRef
    • Effect of light intensity, light-curing unit exposure time, and porcelain thickness of ips e.max press and vintage LD press on the hardness of resin cement
      Silvia Naliani, Suzan Elias, Rosalina Tjandrawinata
      Scientific Dental Journal.2020; 4(1): 21.     CrossRef
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