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Crystalline properties and morphology of bulk-fill dental resin composites as function of light-cure protocol and composition

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Abstract

It is very important to characterize the crystalline and amorphous phases of resin composites because they are associated with the material’s mechanical behavior. Therefore, this study aimed to determine the inorganic elemental composition (by EDXRF), crystalline and amorphous phases, crystallinity index, crystallite size, average distance between scattering centers (by XRD) and morphology (by SEM) of three bulk-fill resin composites with different flowability submitted to different light-cure protocols. Samples (N = 3) of Tetric N-Ceram bulk-fill (TNC), Opus bulk-fill (OBF), and Filtek bulk-fill Flow (FBFF) resins were submitted to the following light-cure protocols: control (P0)—not irradiated; standard (P1)—irradiance of 1000 mW/cm2 for 20 s; and Xtra (P2)—irradiance of 3200 mW/cm2 for 6 s. The composite’s crystallinity showed to be dependent on the type of filler loads and not dependent of the light-cure protocol. The TNC and FBFF resins were identified as semi-crystalline materials, while OBF presented only an amorphous halo. Although the light-cure protocol did not influence the composite’s crystalline properties, the polymeric particles observed on composite’s surface presented smaller average particle size and were more homogeneous when samples were irradiated with higher potency (P2). Only YbF3 (found in TNC and FBFF) and ZrO2 (found in FBFF) compounds contribute to the crystalline phase of the BFRCs tested, besides being the only particles detected in the nanometric scale.

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Authors and Affiliations

  1. Laboratório de Ressonância Paramagnética Eletrônica (LARPE), Departamento de Física, Universidade Estadual de Londrina, C. P. 6014, Londrina, PR, 86051-990, Brazil

    Daina Dayana Arenas Buelvas, Bruno Luiz Santana Vicentin & Eduardo Di Mauro

  2. Laboratório de Filmes Finos e Materiais (FILMAT), Departamento de Física, Universidade Estadual de Londrina, Londrina, PR, Brazil

    Alexandre Urbano

  3. Departamento de Odontologia Restauradora, Universidade Estadual de Londrina, Londrina, PR, Brazil

    João Felipe Besegato & Márcio Grama Hoeppner

  4. Laboratório de Física Nuclear Aplicada (LFNA), Departamento de Física, Universidade Estadual de Londrina, Londrina, PR, Brazil

    Tiago Dutra Galvão & Paulo Sérgio Parreira

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  1. Daina Dayana Arenas Buelvas
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Correspondence to Bruno Luiz Santana Vicentin.

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Buelvas, D.D.A., Vicentin, B.L.S., Urbano, A. et al. Crystalline properties and morphology of bulk-fill dental resin composites as function of light-cure protocol and composition. Polym. Bull. 80, 2349–2366 (2023). https://doi.org/10.1007/s00289-022-04163-9

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  • DOI: https://doi.org/10.1007/s00289-022-04163-9

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