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 Y2
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 Y2
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 Y2
particles could be applicable for further development of fluorescent orthodontic adhesives.
Key words: fluorescence, orthodontic adhesives, europium, yttrium oxide, dispersion
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