Nano Biomedicine

Evaluation of Fluorescent Orthodontic Adhesives Containing Y2O3:Eu3+ Particles

Shuichi YAMAGATA1, Yoshiaki SATO1, Takaaki YAMAMOTO1, Shigeaki ABE2, Tsukasa AKASAKA2, Yasuhiro YOSHIDA2, and Junichiro IIDA1
1Department of Orthodontics, Graduate School of Dental Medicine,
Hokkaido University, Sapporo, Japan
2Department of Biomedical Materials and Engineering,
Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan

Nano Biomed 2016;8(1): 35-40, (June 30, Nano Biomedicine)

Orthodontic adhesives are usually colorless and transparent for aesthetic purposes. However, making such adhesives fluorescent is one of the most effective solutions to make them visible to ensure safe and complete removal after orthodontic treatments. Trivalent europium ions were doped into yttrium oxides by a homogeneous precipitation method. The particles were synthesized via a homogeneous precipitation method and had a narrow size distribution (200-300 nm) and showed sharp crystallinity independent of the starting concentration of Eu3+. The strongest emission and absorption peaks were identified at 611 nm and 396 nm, respectively. In this study, 8 mol% was confirmed to be the optimum doping concentration. The emission intensity of phosphor containing PMMA adhesives was appreciably weak even when the concentration of phosphors was 10 wt%. It may be attributed to the clustering of the particles or a multiphonon relaxation process owing to organic groups in the polymer. We conclude that the crystalline Y2O3:Eu3+particles could be applicable for the development of fluorescent orthodontic adhesives.

Key words: fluorescence, quenching, orthodontic adhesives, europium, yttrium oxide

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