| Project/Area Number |
12671892
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
補綴理工系歯学
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
NAKAGAWA Masaharu Kyushu Unive., Faculty of Dental Science, Research Associate, 歯学研究院, 助手 (80172279)
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| Co-Investigator(Kenkyū-buntansha) |
UDOH Kouichi Kyushu Unive., Faculty of Dental Science, Research Associate, 歯学研究院, 助手 (60145266)
MATSUYA Sigeki Kyushu Unive., Faculty of Dental Science, Associate Professor, 歯学研究院, 助教授 (00108755)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥2,900,000 (Direct Cost: ¥2,900,000)
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| Keywords | Titanium / Titanium alloy / Corrosion / Fluoride / Implant / Dissolved Oxygen |
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| Research Abstract |
The effects of dissolved-oxygen concentration and fluoride concentration on the corrosion behaviors of commercial pure titanium (Ti), Ti-6A1-4V and Ti 6A1-7Nb alloys and experimentally produced Ti-0.2Pd and Ti-0.5Pt alloys were examined by the corrosion potential measurements, dissolved Ti analyses and surface analyses of the specimen. Pure Ti, Ti-6A1-4V and Ti-6A1-7Nb alloys were easily corroded even in a low fluoride concentration in an acidic environment. The corrosion resistance of Ti-0.2Pd and Ti-0.5Pt alloys were greater than those of pure Ti, Ti-6A1-4V and Ti-6A1-7Nb alloys in the wide range of pH and fluoride concentrations. The high corrosion resistance of Ti- 0.2Pd and Ti-0.5Pt alloys were caused by the surface enrichment of Pd or Pt promoting a repassivation of Ti.
Decrease in the dissolved-oxygen concentration tended to have reduced the corrosion resistance of Ti and Ti alloys. Under the low, dissolved-oxygen environment, the corrosion of pure Ti and Ti-6A1-4V and Ti-6A1-7Nb alloys might easily take place in the presence of small amount of fluoride. They were corroded by the half or less fluoride concentration in commercial dentifrices (1OOOppmF). The Ti-0.2Pd and Ti-0.5Pt alloys did not corrode even under the low dissolved-oxygen concentration and fluoride-containing environment. These alloys are expected to be useful as new Ti alloys with high corrosion resistance in dental use.
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