| Project/Area Number |
18592090
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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 |
Conservative dentistry
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| Research Institution | Hiroshima University |
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Principal Investigator |
SHIRAI Kenichi Hiroshima University, Graduate School of Biomedical Sciences, Assistant Professor (20325179)
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| Co-Investigator(Kenkyū-buntansha) |
ARAKAWA Makoto Hiroshima Univeraity, Hospital, Assistant Professor (60379881)
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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 |
¥3,900,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2006: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | silane coupling agent / XPS / silanol group / filler |
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| Research Abstract |
Dental composite contains three different phases, matrix, silane coupling and filler, Their structures and mechanical properties of each phase mainly have an impact on transformation and destructive behavior. We have established pre-silanization decontamination method at previous year that increased adsorption of silane coupling agent on filler surface. The aim of this study is to determine experimental composites produced following pre-silanization decontamination of filler using a Vickers hardness method and a diametral tensile strength after thermo-cycling.
Measurement of the diametral tensile strength revealed that the immediate (no thermo-cycling) diametral tensile strength of the filler-decontaminated composite (43.1 ± 4.2 MPa) was not significantly different (p<0.05) from that of the control composite (40.9 ± 6.2 MPa). However, thermo-cycling for 10,000 cycles resulted in diametral tensile strength of 38.5 ± 4.2 MPa for the experimental composite, which were significantly higher than those of the thermo-cycled control material, being 28.8 ± 4.0 MPa.
This presilanization decontamination methodology improved directly the physico-mechanical properties of composites thanks to improved and more hydrolysis-resistant filler-matrix coupling.
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