| Project/Area Number |
06454561
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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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 | TSURUMI UNIVERSITY |
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Principal Investigator |
HIRANO Susumu Tsurumi University School of Dental Medicine, Associate Professor, 歯学部, 助教授 (00089400)
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| Co-Investigator(Kenkyū-buntansha) |
NOMOTO Rie Tsurumi University, School of Dental Medicine, Instructer, 歯学部, 助手 (20180789)
HIRASAWA Tadashi Tsurumi University, School of Dental Medicine, Professor, 歯学部, 教授 (80064335)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 1995: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1994: ¥4,900,000 (Direct Cost: ¥4,900,000)
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| Keywords | Dental resin composite / Magnetic attachment / Metal filler / Attraction force / Stainless steel |
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| Research Abstract |
This new experimental composite has a good shelf life and can be easily handled during restoration.
The maxmal flexural strength and the Knoop hardness value of this compositewere 7.7kgf/mm^2 and 64 respectively, when the filler was treated with 1.5g gamma MPTS in 70% ethanol solution per 100g of stainless steel filler. However mechanical properties of the composite require improvement for clinical application.
After immersion in 1% lactic acid solution at 37ﾟC for 7 days, the total amount of metal eluted from the composite was 0.7mg/cm^2. This value is under the Japanese apporval specifications for dental casting Ni-Cr alloys (1mg/cm^2).
The attraction force measurement using mandibular model showed a 25% decrease in attraction force of the magnet/composite system compared to that the magnet/keeper system.
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