Nano Biomedicine
ORIGINAL ARTICLE

Morphology and Fluorescence of Y2O3:Eu3+ Nanophosphors and Dispersibility in Adhesives Resins

Shuichi YAMAGATA1, Takaaki YAMAMOTO1,
Yoshiaki SATO1, Natsumi USHIJIMA2, Tsukasa AKASAKA3,
and Yasuhiro YOSHIDA3

 1Department of Orthodontics, Faculty of Dental Medicine and
Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
2Support Section for Education and Research, Faculty of Dental Medicine and
Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
3Department of Biomedical Materials and Engineering, Faculty of Dental Medicine and
Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
Nano Biomed 2019; 11(2): 57-64, (Dec 30, Nano Biomedicine)
Synopsis
After orthodontic treatment has been completed, we consider fluorescent imaging to be one of the most effective solutions for secure removal of colorless residual adhesives from tooth surfaces using cutting instruments. Nanoscale Y2O3:Eu3+ particles were synthesized using the homogeneous precipitation method with two different starting concentrations of urea aqueous solutions, followed by firing at 1000°C. These particles exhibited narrow size distribution (approx. 200-300 nm) and sharp crystallinity regardless of the urea concentration. Moreover, their photoluminescence peak corresponded well with the typical 4f-4f transitions of Eu3+. The Y2O3:Eu3+ particles were almost uniformly dispersed and retained in the monomer blends and polymerized bulk bodies. Photoluminescence measurement is a valid detection method and can be useful for future studies on dispersion control. We conclude that the crystalline Y2O3:Eu3+ particles could be applicable for further development of fluorescent orthodontic adhesives.

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

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DOI https://doi.org/10.11344/nano.11.57