Optical and Chromatic Evaluation of Fluorescent Orthodontic Bonding Materials Doped with a Europium β-diketonate Complex

DOI
  • MATSUMOTO Aiko
    Department of Orthodontics, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
  • YAMAGATA Shuichi
    Department of Orthodontics, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
  • ABE Shigeaki
    Department of Biomedical Materials and Engineering, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
  • AKASAKA Tsukasa
    Department of Biomedical Materials and Engineering, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
  • YOSHIDA Yasuhiro
    Department of Biomedical Materials and Engineering, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
  • IIDA Junichiro
    Department of Orthodontics, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan

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Abstract

<p>We have the purpose of evaluating fluorescent imaging for orthodontic bonding materials doped with a europium β-diketonate complex. Tris(1,3-diphenyl-1,3-propanedionato) (1,10-phenanthroline)Eu(III) [Eu(DBM)3Phen]–doped poly(methyl methacrylate) (PMMA) adhesives were prepared by two kinds of radical in situ polymerization methods at room temperature, a benzoyl peroxide/tertiary amine (BPO/amine) redox method, and radical generation by oxygen coordination to partially oxidized tri-n-butyl borane (TBBO) method. However, the photoluminescence of the composites obtained by the latter system was inadequate. The reason for this phenomenon is speculated to be steric hindrance of DBM by TBBO. In contrast, fluorescent Eu(DBM)3Phen/PMMA composites were successfully prepared by the BPO/amine redox method. The transparent and almost colorless appearance of these composites under natural light is favorable for application as an esthetic dental product. Strong emission of Eu3+ at 613 nm was observed to gradually increase as the concentration of the complex increased. Based on the results obtained, we can conclude that this Eu(DBM)3Phen/PMMA adhesive can be used for developing photoluminescent orthodontic bonding materials.</p>

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