치과용 Ni-Cr과 Co-Cr 합금의 부식성과 도재와의 접합 특성

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Using the specimen (L 1.5cm × W 1.0cm × T 0.5cm) of Ni-Cr and Co-Cr
alloys which were fabricated by centrifugal casting, composite samples of
porcelain fused to metal were prepared to examine the interface between metal
and porcelain with the utilization of optical microscope (OM) and scanning
electron microscope (SEM). As compared to porcelain fused to Ni-Cr alloy
having thick layer (~10㎛) of oxide, relatively thin layer (less than 5㎛) was
formed in porcelain fused to Co-Cr alloy indicating that the interface of Co-Cr
alloy and porcelain is strong enough, and that it could have a better adhesion
strength than that of Ni-Cr alloy and porcelain, to be used as a dental
prosthesis. The oxide layer was examined and analyzed to be mainly Al2O3 and
Cr2O3 by EDX.
The corrosion rates are determined from the polarization curves based on the
Tafel extrapolation method. The corrosion rate of Co-Cr alloy (1.61×10-6A/㎠)
was three times lower than that of Ni-Cr alloy (4.83×10-6A/㎠) indicating that
corrosion resistance of Co-Cr alloy is better.
A composite of porcelain fused to Ni-Cr alloy extracted from a patient after
about four years of usage was examined to show its resistance to corrosion.
The composite was made up with two parts; one being metal covered with
porcelain and the other being only bare metal exposed to environment. OM and
SEM images for the exposed metal reveal a typical corrosion after the usage of
about four years by a patient. The indication of corrosion means that Ni and its
compounds could be formed when Ni is released and absorbed in a body.
Therefore it is necessary further to do in vivo experiment to evaluate the
hazardousness of Ni and its compounds to human body.
The aim of this research was to suggest a better replacement of Co-Cr over
Ni-Cr alloy as a dental prosthesis for a long term use and to warn the public
about the possibility of carcinogenicity of Ni and its compounds when absorbed
in a human body.
Alternative Title
Corrosion characteristics of Ni-Cr or Co-Cr alloy as a dental prosthesis and its adhesion to porcelain
Alternative Author(s)
Kim, Gi Jung
일반대학원 첨단소재공학과
Table Of Contents
제 1 장 서론 1
제 2 장 이론적 배경 3
제 1 절 치과용 도재의 발달 3
1. 치과 도재학의 역사 3
2. 치과용 합금 분류 9
3. 치과용 도재의 성분 13
4. Ni-Cr 혹은 Co-Cr 합금과 Porcelain의 용착성 연구 18
5. Ni 화합물의 발암성 식약청 자료19
제 3 장 실험방법 21
제 1 절 시편제작 21
1. Ni-Cr 및 Co-Cr 합금 제작 및 관찰 21
2. 도재와 금속간의 용착성 실험을 위한 시편 제작 23
제 2 절 실험 및 관찰방법 25
제 4 장 연구 결과 및 고찰 27
제 1 절 금속과 도재의 계면의 미세조직 27
제 5 장 결론 44
참고문헌 45
부록 46
김기정. (2014). 치과용 Ni-Cr과 Co-Cr 합금의 부식성과 도재와의 접합 특성.
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General Graduate School > 3. Theses(Master)
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