Fatigue Resistance and Flexural Behaviour of a Fiber-Reinforced Resin Composite for Removable Partial Denture Clasps
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概要
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It is necessary to evaluate the fatigue resistance of fiber-reinforced resin composites (FRCs) subjected to repeated constant deflections corresponding to the undercut when FRCs are applied to removable partial denture clasps. The aim of this study was to evaluate the fatigue resistance of FRC clasps (EG fiber: EG fiber of Estenia C & B) using a constant deflection fatigue test, and to compare it with that of a gold-palladium-silver alloy (Pd alloy). The flexural strength, Young's modulus and fracture behaviour of the EG fiber flexural specimens under three-point bending were also evaluated. A constant deflection fatigue test was carried out in air at room temperature either until 990,000 deflections were completed, or until clasp fracture, or permanent deformation was detected. Repeated constant deflections of either 0.25mm or 0.5mm were administered to the clasps by reciprocating movements of a loading rod. The clasp resistance against these repeated deflections, that is, the clasp fatigue limit, was measured in terms of the number of repeated cycles. For Pd alloy clasps, the mean value of the clasp fatigue limit was 184, 900±66,359 deflections of 0.25mm, and 91,908±6,532 times for 0.5mm, respectively. In these conditions, all Pd alloy clasps were fractured at their clasp fatigue limit. On the other hand, for EG fiber clasps, no permanent deformation was detected even after 990,000 deflections, however, delamination of the glass fiber and a crack expanding horizontally the a longitudinal axis of the clasp were observed on the compression side. The mean values of three-point flexural strength and Young' modulus for the EG fiber were 907.3±35.4MPa and 24.2±1.4GPa, respectively. When the stress was increased to exceed the proportional limit, some decreases in strain due to brittle tensile failure of the glass fibers and matrix transverse splitting were observed in the stress-strain curves. The flexural specimen kept supporting the load, however, and no catastrophic failure was observed until the stress increased to its flexural strength.
- 朝日大学の論文
- 2006-02-20
著者
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WAKAMATSU Nobukazu
Department of Dental Materials Science, Division of Oral Functional Science and Rehabilitation, Asah
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DOI Yutaka
Department of Dental Materials Science, Division of Oral Functional Science and Rehabilitation, Asah
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Iwahori Masatoshi
Department Of Prosthodontics Division Of Oral Functional Science And Rehabilitation Asahi University
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Doi Yutaka
Department Of Dental Material Science Division Of Oral Functional Science And Rehabilitation Asahi U
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TAKITA FUMIKO
Department of Prosthodontics, Division of Oral Functional Science and Rehabilitation Asahi Universit
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MIYAO MOTONOBU
Department of Prosthodontics, Division of Oral Functional Science and Rehabilitation Asahi Universit
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Takita Fumiko
Department Of Prosthodontics Division Of Oral Functional Science And Rehabilitation Asahi University
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Miyao Motonobu
Department Of Prosthodontics Division Of Oral Functional Science And Rehabilitation Asahi University
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Doi Yutaka
Department Of Cardiology
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Wakamatsu Nobukazu
Dep. Of Dental Materials Sci. Div. Of Oral Functional Sci. And Rehabilitation Asahi Univ. School Of
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Wakamatsu Nobukazu
Department Of Dental Material Science Division Of Oral Functional Science And Rehabilitation Asahi U
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