Nano Biomedicine
ORIGINAL ARTICLE

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

Aiko MATSUMOTO1, Shuichi YAMAGATA1, Shigeaki ABE2, Tsukasa AKASAKA2, Yasuhiro YOSHIDA2, and Junichiro IIDA1

 1Department of Orthodontics, Faculty of Dental Medicine and Graduate School of
Dental Medicine, Hokkaido University, Sapporo, Japan
2Department of Biomedical Materials and Engineering, Faculty of Dental Medicine and
Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
Nano Biomed 2018; 10(1): 3-8, (Jun 30, Nano Biomedicine)
Synopsis
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.

Key words: orthodontic adhesive, europium complex, photoluminescence, chromaticity

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J-Stage https://www.jstage.jst.go.jp/browse/nano/10/1/_contents/-char/en

DOI https://doi.org/10.11344/nano.10.3