| Project/Area Number |
18592154
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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 | Asahi University |
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Principal Investigator |
IWAHORI Masatoshi Asahi University, School of Dentistry, Lecturer (00247553)
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| Co-Investigator(Kenkyū-buntansha) |
MIYAO Motonobu Asahi Univ., School of Dentistry, Professor (90190735)
WAKAMATSU Nobukazu Asahi Univ., School of Dentistry, Assitant Professor (00158594)
TAKITA Fumiko Asahi Univ., School of Dentistry, Assitant Professor (10434507)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥4,040,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥540,000)
Fiscal Year 2007: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2006: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | GFRC / glass fiber-reinforcement type composite resin / clasp / four-point flexural strength / constant fatigue test / FRC |
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| Research Abstract |
We examined the clinical application of the clasps using glass fiber-reinforced resin composite (GlektC) and carried out a constant fatigue test of the straight model clasps, and also evaluated the four-point flexural strength. From the results of those tests, the GFRC specimens were found to have a superior fatigue resistance in comparison to the Pd alloy, but they demonstrated exfoliation of both glass fibers and the matrix resin, and some cracks. In this study, to improve the esthetics of such GFRC clasps, and also to prevent the exfoliation of both glass fibers and the matrix resin, the fatigue resistance of the GFRC clasps with resin coating was evaluated by both thermal cycling and cyclic fatigue tests.
After the thermal cycling and cyclic fatigue test for 3 months of oral usage, exfoliation and cracks were observed on the coating. However the loading which needed to displace the retention arm 0.25mm did not change. After a 3 month recall, clasps which have cracks and exfoliation should be re-coated with resin. Therefore, GFRC clasps with a resin coating may be used for the clinical application in combination with careful follow-up examinations to identify any cracking and exfolia-tion.
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