| Project/Area Number |
12671894
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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 | Nagasaki University |
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Principal Investigator |
TAKUMA Yasuko Nagasaki University, Dept. Dental Materials Science, Research Fellow, 歯学部, 教務職員 (60160074)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Yasuhiro Nagasaki University, Dept. Dental Materials Science, Instructor, 歯学部, 助手 (10217086)
SHIRAISHI Takanobu Nagasaki University Dept. Dental Materials Science, Associate Professor, 歯学部, 助教授 (10150468)
HISATSUNE Kunihiro Nagasaki University, Dept. Dental Materials Science, Professor, 歯学部, 教授 (20037526)
MIURA Eri Nagasaki University, Dept. Dental Materials Science, Instructor, 歯学部, 助手 (70315258)
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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 |
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | dental alloy / morphology / fractal analysis / wuantification / grain boundary reaction / fractal dimension / 歯科材料 / 結晶粒微細化 |
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| Research Abstract |
Fractal theory was applied to the quantification of the morphological characteristics of grain boundary reaction in dental alloys. The optical microstructure images of a gold alloy for porcelain fusing and a Ag-Pd-Cu-Au alloy were transformed into black-and white images by using a threshold method with a given threshold value. The binary images of each sample clearly showed the growth of grain boundary precipitates with increasing aging time or temperature. Fractal dimension value of the binary images which was computed by fractal dimension calculation program apparently increase with the progress of grain boundary precipitation.
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