Effect of Corrosion Behavior of Pure Titanium and Titanium Alloy on Fluoride Addition in Acidic Environment by Streptococcus mutans (Corrosion Behavior of Titanium by Fluoride and Streptococcus mutans)

DOI Web Site 被引用文献2件 参考文献29件
  • Matono Yoshinari
    Department of Fixed Prosthodontics, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University
  • Nakagawa Masaharu
    Department of Biomaterials, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University
  • Ishikawa Kunio
    Department of Biomaterials, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University
  • Terada Yoshihiro
    Department of Fixed Prosthodontics, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University

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Purpose: As for commercially pure titanium (CP-Ti) and titanium alloys (Ti-6Al-4V, Ti-6Al-7Nb), when fluoride exists in an acidic environment, it is known to corrode from recent research. However, it is also reported that the corrosion resistance improves when small amount of platinum is added to pure titanium. The purpose of this study is to examine the corrosion behavior of CP-Ti, Ti-6Al-4V, Ti-6Al-7Nb, and high corrosion Ti-0.5Pt alloy when a fluoride added to the acidic environment produced by streptococcus mutans.<BR>Methods: The specimen (CP-Ti, Ti-6Al-4V, Ti-6Al-7Nb, and experimentally produced Ti-0.5Pt alloy) were polished like a mirror. Streptococcus mutans was cultured for 24 hours with brain heart infusion (BHI) medium adding sucrose on the specimen, and then 1000ppm fluoride solution of same medium volume was added (that is, fluoride concentration becomes 500 ppm). After 10 min, all the solutions were removed and new culture for 24 hours started again. These cycles of 3, 5, 7, and 10 times were repeated and the surfaces of the specimens were observed by scanning electron microscope (SEM).<BR>Results: The CP-Ti and Ti-6Al-4V, Ti-6AL-7Nb alloys were observed the typically metallographical structure by adding fluoride solution repeatedly. The surface of Ti-0.5Pt alloy was no change by adding fluoride solution.<BR>Conclusion: When a fluoride with less than 500 ppm concentration was added to the acid biofilm which was produced by Streptococcus mutans, as for CP-Ti, Ti-6Al-4V and Ti-6Al-7Nb alloys the possibility to corrode was suggested. The Ti-0.5Pt alloy had a high corrosion resistance in the same condition.

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