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Journal of Prosthetic Dentistry

Impact of postpolymerization devices and locations on the color, translucency, and mechanical properties of 3D-printed interim resin materials

  • Juhea Chang
    Affiliations
    Clinical Professor, National Dental Care Center for Persons with Special Needs, Seoul National University Dental Hospital, Seoul, Republic of Korea
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  • Yukyung Choi
    Affiliations
    Graduate Student, Department of Dental Biomaterials Science, School of Dentistry, Seoul National University, Seoul, Republic of Korea
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  • Wonjoon Moon
    Affiliations
    Researcher, Department of Dental Biomaterials Science, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea; Research Fellow, Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Mass and Research Fellow, Harvard Medical School, Boston, Mass
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  • Shin Hye Chung
    Correspondence
    Corresponding author: Dr Shin Hye Chung, Department of Dental Biomaterials Science, Dental Research Institute, School of Dentistry, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul 03080, REPUBLIC OF KOREA
    Affiliations
    Associate Professor, Department of Dental Biomaterials Science, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea
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Published:September 27, 2022DOI:https://doi.org/10.1016/j.prosdent.2022.08.018

      Abstract

      Statement of problem

      How postpolymerization conditions affect the color and mechanical properties of 3-dimensional (3D)-printed prostheses is unclear.

      Purpose

      The purpose of this in vitro study was to evaluate the color, microhardness, and flexural strength of 3D-printed interim resin materials and to assess the effect of postpolymerization devices, polymerizing locations, and thermocycling on those properties.

      Material and methods

      A total of 270 disk-shaped specimens and 180 bar-shaped specimens were designed and 3D-printed with interim resin material (NextDent C&B). The specimens were postpolymerized in 1 of 3 devices (Group ND; NextDent, Group CR; Carima, and Group FL; Formlabs). Each group was divided into 3 circular zones of the polymerizing plate (central, medial, and lateral). Half of the specimens were subjected to 10 000 thermocycles. Color measurement, Vickers microhardness test, and 3-point flexural strength test were performed. Data were statistically analyzed by using the Kruskal-Wallis and Mann-Whitney tests (α=.05).

      Results

      The L∗a∗b∗ color coordinates exhibited significant differences among the 3 zones (P<.05). The color and translucency differences according to CIELab and CIEDE among the zones exceeded the clinically perceptible levels in group CR. ΔE and ΔTP between with and without thermocycling were significantly different among the devices (P<.05). Microhardness and flexural strength were significantly different among the zones for those affected by thermocycling (P<.05).

      Conclusions

      Different locations in postpolymerization devices influenced the color, translucency, and mechanical properties of 3D-printed interim resin materials. Thermocycling induced color and translucency changes and the mechanical weakening of postpolymerized resins, and the impact differed according to the device type.
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