Effect of Cristobalite and Quartz on the Properties of Gypsum Bonded Investment

材料科学技术（英文）, 2008, 24(1): 143-144.

^1, , ^2, , ^3, , ^4, , ^5, , ^6, , ^7, , ^8,

1.Korea Institute of Geoscience and Mineral Resources (KIGAM), Gajeong-dong 30, Yuseong-ku, Daejeon 305-350,Korea

2.Korea Institute of Geoscience and Mineral Resources (KIGAM), Gajeong-dong 30, Yuseong-ku, Daejeon 305-350,Korea

3.Korea Institute of Geoscience and Mineral Resources (KIGAM), Gajeong-dong 30, Yuseong-ku, Daejeon 305-350,Korea

4.Department of Materials Engineering, Graduate School, Paichai University, Daejeon 302-735, Korea

5.Department of Materials Engineering, Graduate School, Paichai University, Daejeon 302-735, Korea

6.Dept. of Dental Laboratory Technology, Daejeon Health Science College, Korea

7.Department of Materials Engineering, Graduate School, Paichai University, Daejeon 302-735, Korea

8.Korea Institute of Geoscience and Mineral Resources (KIGAM), Gajeong-dong 30, Yuseong-ku, Daejeon 305-350,Korea

Effect of Cristobalite and Quartz on the Properties of Gypsum Bonded Investment

Yun-Jong Kim ^1, , Sang-Bae Kim ^2, , Hyun-Hye Park ^3, , Myeong-Deok Seo ^4, , Byoung-Cheon Lee ^5, , Man-So Han ^6, , Taik-Nam Kim ^7, , Sung-Baek Cho ^8,

1.Korea Institute of Geoscience and Mineral Resources (KIGAM), Gajeong-dong 30, Yuseong-ku, Daejeon 305-350,Korea

2.Korea Institute of Geoscience and Mineral Resources (KIGAM), Gajeong-dong 30, Yuseong-ku, Daejeon 305-350,Korea

3.Korea Institute of Geoscience and Mineral Resources (KIGAM), Gajeong-dong 30, Yuseong-ku, Daejeon 305-350,Korea

4.Department of Materials Engineering, Graduate School, Paichai University, Daejeon 302-735, Korea

5.Department of Materials Engineering, Graduate School, Paichai University, Daejeon 302-735, Korea

6.Dept. of Dental Laboratory Technology, Daejeon Health Science College, Korea

7.Department of Materials Engineering, Graduate School, Paichai University, Daejeon 302-735, Korea

8.Korea Institute of Geoscience and Mineral Resources (KIGAM), Gajeong-dong 30, Yuseong-ku, Daejeon 305-350,Korea

Keywords： Investment

Generally the gold investment material consists of cristobalite, quartz and plaster. The physical property of gold investment materials depends on its thermal expansion coefficients, compressive strength, and particles size distribution. Since the thermal expansion coefficient of cristobalite and quartz are 2.6×10-6/℃ and 2.32×10-6/℃ respectively, the composition ratio of each components influence the thermal and physical properties of gold investment materials. For the clinical applications, it is necessary to improve the properties of gold investment materials such as homogeneous size distribution and thermal expansion coefficients. In the present study, effect of inorganic fillers such as cristobalite and quartz on gold alloy investment was investigated to improve the properties of it. The compressive strength and thermal expansion coefficients of the specimens were evaluated. The results showed that cristobalite and quartz were homogeneously distributed by milling.The optimum compressive strength was obtained at the ratio of 42:22 cristobalite and quartz, respectively.

参考文献

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[2]	Y M Ko;K N Kim.Science of Dental Materials[M].Koonja Publishing Inc,Korea,1998:385.
[3]	S W Yang;I D Yeo;D S Lim .[J].Journal of Korean Forestry Society,1999,19(02):116.
[4]	J HAhn;J N Lee .[J].Journal of Korean Forestry Society,1985,5(02):85.
[5]	J H Sunwoo;J N Lee .[J].Journal of Korean Forestry Society,1985,5(02):97.

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