| Project/Area Number |
03670919
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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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 |
OHTA Michio KYUSHU UNIVERSITY FAC.DENTISTRY PROFESSOR, 歯学部, 教授 (30037824)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAGAWA Masaharu KYUSHU UNIVERSITY FAC.DENTISTRY RESEARCH ASSOCIATE, 歯学部, 助手 (80172279)
SHIRAISHI Takanobu KYUSHU UNIVERSITY FAC.DENTISTRY ASSISTANT PROFESSOR, 歯学部, 講師 (10150468)
MATSUYA Shigeki KYUSHU UNIVERSITY FAC.DENTISTRY ASSOCIATE PROFESSOR, 歯学部, 助教授 (00108755)
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| Project Period (FY) |
1991 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1992: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1991: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | DENTAL GOLD ALLOY / EQUIATOMIC AuCu / LOW TEMPERATURE AGE-HARDENING / AuCu-Ga ALLOY / AuCu-Al ALLOY / AuCu-Ga・合金 / AuCu-Al合金 / AuCuーGa合金 / AuCuーAl合 |
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| Research Abstract |
Dental gold alloys with age-hardenability at intraoral temperature were developed. Either 3 or 6 at% Ga,Al,Zn,In,Ni or Pd were added to the equiatomic AuCu alloy and the effect of additives on the low temperature age-hardenability was examined. Alloys containing Ga,Al or Zn exhibited excellent low temperature age-hardenability. The hardness of an alloy containing 6 at% Ga or 6 at% Al was doubled in one to ten days by aging at 37ﾟC. On the other hand,addition of Ni or Pd decreased the low temperature age-hardenability. Pronounced hardening was not demonstrated in an as-cast alloy,but solution treatment for only a few minutes provided enough age-hardenability. Age-hardening rate at low temperature related closely with the melting temperature of the alloy.
It is concluded that Ga,Al or Zn added AuCu alloy is expected to have enough age-hardenability for clinical use in the oral environment.
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