The Study of Plasma Based Fluorine Ion Implantation into Dental Materials for Inhibition of Bacterial Adhesion

The purposes of the present study were to evaluate the profile and spectra of dental materials modified by plasma based fluorine ion implantation into the surface of dental materials and to evaluate the effects of fluorine ion implantation on the contact angle, surface roughness, fluorine ion release and bacterial adhesion. The dental materials used for evaluation were pure titanium, stainless steel SUS316L and polymethyl methacrylate. Fluorine gases for plasma based ion implantation were Ar+F_2 (95% argon and 5% F_2) and CF_4. The results were as follows: 1. The peak count of fluorine ion implanted into polymethyl methacrylate was significantly lower than titanium and stainless steel. The peak count of fluorine in titanium was higher than stainless steel and polymethyl methacrylate, but the surface of titanium discolored, might be corrosion, after plasma based fluorine ion implantation. 2. The depth of fluorine ion implantation by CF_4 gas into stainless steel was 173.3±144.8nm in SIMS analysis and until second layer (1.0 minute argon gas sputtering) in XPS analysis. 3. XPS spectra of fluorine ion implanted stainless steel showed peaks of fluorine and chromic fluoride. 4. Fluorine ion implantation into stainless steel significantly increased contact angle, but did not change surface roughness. 5. A small amount of fluorine ion released from the surface of the fluorine ion implanted stainless steel until 48 hours immersion in deionized water. Fluorine ion might not release from the inside but from the fluorine ion contaminated surface. 6. Initial 4 hours adhesion of S. mutans on the surface of fluorine ion implanted stainless steel significantly decreased compared with fluorine ion non-implanted control. Long-term 7 days and 21 days adhesion did not change compared with fluorine ion non-implanted control. 7. The fluorine ion implanted stainless steel showed significantly lower number of CFU, i.e., significantly higher antibacterial activity. It was concluded that the plasma based fluorine ion implantation into the dental materials could inhibit bacterial adhesion on the surface of the dental materials.

公開日:2010年1月24日で登録したコンテンツは、国立情報学研究所において電子化したものです。