Metal ion elution, including Cr and Ni from dental orthodontic stainless steel, accounts for some allergies. In this study, a self-assembled monolayer (SAM) on a wire surface is proposed for suppressing such elution. This method involves modifying the stainless steel surface using phosphonic acid containing a long alkyl chain. The uncoated and coated wires are immersed in different acidic solutions, and the supernatant is analyzed by inductively coupled plasma mass spectrometry after 1-4 weeks. The results reveal that Cr and Ni ion elution is significantly suppressed by SAM modification. These findings will help in minimizing potential allergens from dental orthodontics.
緒言As alkali increase in the seawater resulted from dissolved free CaO of the steelmaking slag, its rate proceeded at the constant rate. When slag diameter was too small, alkali elution rate decreased because the penetration of the seawater in the lower part of slag layer was insufficient, whereas when slag diameter was too large, it also decreased due to the decrease in interfacial area of reaction. Alkali elution rate increased according to 1/3 power of liquid circumferential velocity, increased with free CaO content in steelmaking slag within about 2 % and decreased with an increase in ratio of dredged soil.
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