Nano Biomedicine
Preparation and Properties of Fluorescent Orthodontic Adhesives Containing Y2O3:Eu3+ Particles

Yusuke HAMBA1, Shuichi YAMAGATA1, Tsukasa AKASAKA2, Motohiro UO3, Junichiro IIDA1, and Fumio WATARI2

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
3Advanced Biomaterials, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan

Nano Biomedicine 2013;5(2): 75-84, (Dec 30)

Orthodontic adhesives are typically colorless and transparent for aesthetic purposes. The utilization of fluorescence is one of the most effective solutions to make the adhesives visible for safe and complete removal after orthodontic treatments. Eu3+ ions were doped into yttrium oxides (Y2O3) using a homogeneous precipitation method. The crystals synthesized in this study exhibited submicron sizes and a very narrow size distribution. The X-ray diffraction (XRD) patterns agreed well with the known diffraction patterns of Y2O3, and indicated an absence of any other crystalline substances. Therefore, it was determined that the crystals synthesized in this study were in fact Y2O3:Eu3+. The spectra of the poly(methyl methacrylate) (PMMA) adhesives containing Y2O3:Eu3+ particles exhibited characteristic excitation and emission peaks corresponding to the 4f-4f transitions of Eu3+, despite the photoluminescence intensity being relatively low. The yielding loads of the Y2O3:Eu3+ particles contained in the PMMA specimens did not deteriorate by a significant amount. We conclude that it is feasible to add the Eu3+-doped Y2O3 crystalline particles into orthodontic adhesives.

Key words: fluorescence, lanthanide, europium, yttria oxide, orthodontic adhesive

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