Introduction of Rare-Earth-Element- Containing ZnO Nanoparticles into          Orthodontic Adhesives

Shuichi YAMAGATA; Yusuke HAMBA; Ko NAKANISHI; Shigeaki ABE; Tsukasa AKASAKA; Natsumi USHIJIMA; Motohiro UO; Junichiro IIDA; Fumio WATARI

doi:10.11344/nano.4.11

ORIGINAL ARTICLES

Introduction of Rare-Earth-Element- Containing ZnO Nanoparticles into Orthodontic Adhesives

Shuichi YAMAGATA, Yusuke HAMBA, Ko NAKANISHI, Shigeaki ABE, Tsukasa AKASAKA, Natsumi USHIJIMA, Motohiro UO, Junichiro IIDA, Fumio WATARI

Author information

Shuichi YAMAGATA
Department of Orthodontics, Graduate School of Dental Medicine,
Yusuke HAMBA
Department of Orthodontics, Graduate School of Dental Medicine,
Ko NAKANISHI
Department of Orthodontics, Graduate School of Dental Medicine,
Shigeaki ABE
Department of Biomedical Materials and Engineering, Graduate School of Dental Medicine,
Tsukasa AKASAKA
Department of Biomedical Materials and Engineering, Graduate School of Dental Medicine,
Natsumi USHIJIMA
Support Section for Education and Research, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
Motohiro UO
Advanced Biomaterials, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
Junichiro IIDA
Department of Orthodontics, Graduate School of Dental Medicine,
Fumio WATARI
Department of Biomedical Materials and Engineering, Graduate School of Dental Medicine,

Keywords: fluorescence, photoluminescence, europium, zinc oxide, orthodontic adhesive

JOURNAL FREE ACCESS

2012 Volume 4 Issue 1 Pages 11-17

DOI https://doi.org/10.11344/nano.4.11

Details

Abstract

To make orthodontic adhesives visible as needed is valuable for safer and complete removal of them after orthodontic treatments. An attempt was made on doping trivalent europium ions into lattices of zinc oxides to make orthodontic adhesives visible by irradiation with purple or near ultraviolet light. The primary crystals of the synthesized products exhibited various sizes. However, overall, their diameters were on the nanoscale. The XRD patterns of them were in good agreement with those of hexagonal ZnO. However, the patterns also indicated the existence of another crystalline substance that could be indexed as Eu₂O₃. These results lead to the conclusion that ZnO:Eu³⁺ nanoparticles were suitably synthesized via a homogeneous precipitation method. As for the polymer adhesives containing the ZnO:Eu³⁺ nanoparticles, the photoluminescent spectra exhibited characteristic excitation and emission peaks corresponding to the intrinsic intra-4f transitions of Eu³⁺. In addition, the yielding loads of the composite specimens did not deteriorate, regardless of the concentration of the ZnO:Eu³⁺ nanoparticles within the proportion of 1–3 wt%. The results obtained in this study suggest that the introduction of Eu³⁺-doped ZnO nanoparticles into orthodontic adhesives is feasible.

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