치과용 합금의 주조방법에 따른 주조결함 및 내식성에 관한 연구

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Alloyed based on cobalt or nickel and containing a substantial amount of chromium are suitable for the construction of partial denture frameworks. The defects of partial denture frameworks are mainly shrinkage porosity, inclusions, micro-crack, particles from investment, and dendritic structure. In order to investigate a good casting condition of partial denture frameworks, the three casting alloy and casting method were used and detected casting defects using the radiographic testing and electrochemical methods. Three casting alloys(PDS:63Co-27Cr-5.5Mo, Ticonium:63Ni-16Cr, Wironit:63Co-30Cr-5Mo) were prepared for fabricating partial denture frameworks with various casting methods; centrifugal casting(Kerr,USA), high frequency induction casting(Jelenko Eagle,USA), vacuum pressure casting(Bego,Germany). The casting temperature was 1380℃ (PDS and Ticonium) and 1420℃(Wironit). The casting morphologies were analyzed using FE-SEM, EDX, and OM. The detection of casting defects was carried out using radiographic tester(Smart2000E, Denmark) with 40, 80, 120sec. exposure time, tube current(4.5mA) and voltage( 80Kvp). The corrosion test of the dendritic structure was examined through potentiodynamic method in 0.9% NaCl solutions at 36.5° ± 1℃ and corrosion surface was observed using SEM. The defects of partial denture frameworks improved in the order of centrifugal casting, high frequency induction casting, and vacuum pressure casting method, especially, pore defects were found at part of clasp in the case of centrifugal casting method. The structure of casting showed dendritic structure for three casting alloy. In the PDS and Wironit, α-Co and ε-Co were appeared at matrix and γ'-Ni_(2)Cr second phase showed in Ticonium. Also, the corrosion resistance of casted structure increased in the order of vacuum pressure casting, high frequency induction casting, and centrifugal casting method.
It was concluded that the defects of clasps increased or decreased with various casting methods and casting condition, such as dried or wetted investment.
Alternative Title
AStudy on corrosion resistance and cast defects of dental alloys with various casting methods
조선대학교 대학원
일반대학원 치의학과
Awarded Date
Table Of Contents
목차 = i
영문초록 = v
Ⅰ. 서론 = 1
Ⅱ. 연구재료 및 방법 = 3
Ⅲ. 연구 성적 = 5
Ⅳ. 총괄 및 고안 = 7
Ⅴ. 결론 = 10
참고문헌 = 11
유철. (2004). 치과용 합금의 주조방법에 따른 주조결함 및 내식성에 관한 연구.
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General Graduate School > 3. Theses(Master)
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