Nano Biomedicine

Fabrication of Light-curing Type Fluorescent Orthodontic Bonding Materials using Europium-β-diketonate Complex

Shuichi YAMAGATA1, Takaaki YAMAMOTO1, Yoshiaki SATO1, Shigeaki ABE2,
Tsukasa AKASAKA2, and Yasuhiro YOSHIDA1

1Department of Orthodontics, 2Department of Biomedical Materials and Engineering,
Faculty of Dental Medicine and Graduate School of Dental Medicine,
Hokkaido University, Sapporo, Japan

Nano Biomed 2018; 10(2): 53-60, (Dec 30, Nano Biomedicine)

We successfully prepared light-curing type fluorescent resins as orthodontic adhesives doped with tris(1,3-diphenyl-1,3-propanedionato)(1,10-phenanthroline)Eu(III) [Eu(DBM)3Phen] by a photo-induced radical polymerization method. The transparent and almost colorless appearance of the composites under natural light is favorable for an esthetic dental product. The strong luminescence under near-UV light, especially when the content of Eu(DBM)3 Phen is above 0.1 wt%, is promising for safe and complete removal of this adhesive after completing orthodontic treatments. We have also found that concentration quenching may occur around a concentration of 0.2-0.4 wt%. Based on the results obtained, in situ monomer polymerization can be applicable to Eu(DBM)3Phen-containing adhesives. Although we are still investigating this proposed system, we conclude that the Eu(DBM)3 Phen-containing adhesives is a promising candidate for application to fluorescent orthodontic adhesives.

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

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