Study of Resin-bonded Calcia Investment : Part 1. Setting Time and Compressive Strength
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概要
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This study was carried out to develop a new titanium casting investment consisting of calcia as the refractory material and a cold-curing resin system as the binder. The setting time of the investment was investigated under different N, N-dimethyl-p-toluidine(DMPT) contents in methyl methacrylate monomer(MMA) and benzoyl peroxide(BPO) contents in calcia without any sintering agent. The effects of the sintering agents, which were calcium fluoride(CaF_2) and calcium chloride(CaCl_2), on the compressive strength of the investments were investigated at room temperature before and after heating to two different temperatures. The shortest setting time(68 minutes)of the investment was obtained at 0.37 DMPT/BPO(1.5 vol%/1.0 mass%)ratio by mass. The highest strength(16.5 MPa)was obtained from the investment which contained 2 mass% CaF_2 and was heated to 1,100℃. It was found that the developed calcia investment containing 2 mass% CaF_2 has a possibility for use titanium castings.
著者
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Nakai Akira
日本歯科大学新潟歯学部 歯科理工学講座
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NAKAI Akira
Department of Dental Materials Science, School of Dentistry at Niigata, The Nippon Dental University
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Nakai A.
Dept. Of Dent. Mater. Sci. Sch. Sch. Of Dentistry At Niigata The Nippon Dental Univ.
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Nakai A
Department Of Dental Materials Science School Of Dentistry At Niigata The Nippon Dental University
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Nakai Akira
Department Of Biochemistry And Molecular Biology Yamaguchi University Graduate School Of Medicine
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Nakai Akira
Department Of Dental Materials Science School Of Dentistry At Niigata The Nippon Dental University
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