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골내 고정 장치용 초내식성 오스테나이트 및 듀플렉스  

스테인리스강 가공재의 특성



1연세대학교 치과대학 치과생체재료공학 연구소, 2연세대학교 치과대학 교정과학 교실

3연세대학교 공과대학 금속시스템공학과


오근택1 강국진2 박용수3 김경남1

Abstract



Properties of Wrought Super Austenitic and Duplex Stainless Steels for
Skeletal Anchorage System


Keun-Taek Oh1, Kook-Jin Kang2, Yong-Soo Park3, and Kyoung-Nam Kim1


1Department of Dental Biomaterials and Bioengineering, College of Dentistry, Yonsei University, Seoul 120-752, Korea

2Department of Orthodontics, College of Dentistry, Yonsei University, Seoul 120-752, Korea

3Department of Metallurgical Engineering, Yonsei University, Seoul 120-752, Korea



  Received May 10, 2003 ; Accepted May 20, 2003

  Nickel is one of the most common causes of allergic contact dermatitis and hypersensitivity. In case of stainless steel as biomaterials, the higher the corrosion resistance and the lower the nickel content, the better it is for the human body.
 
However, because nickel plays an essential role in the stabilization of the austenitic phase and the corrosion resistance of stainless steel, it is difficult to remove the nickel from the constituents of stainless steels completely.
 
Therefore, the purpose of this study was to investigate corrosion resistance, cytotoxicity, and mechanical property of super stainless steels, which had high corrosion resistance by synergistic effect of Mo(or W) and N, with respect to nickel content and to evaluate their potential for orthodontic applications. Super austentic stainless steel(SR-50A) had high nickel content of 22% and super duplex stainless steels nickel contents of 6~10%. Super austentic and duplex stainless steels had nitrogen contents of above 0.2%. Also, these steels had high Mo or W contents which were able to increase the localized corrosion resistance.
 
In terms of hardness, super stainless steels, which had Vickers hardness values of 374~400 Hv in cold-rolled state and 186~285 Hv in annealed state, exhibited higher values than 316L S.S.. Duplex stainless steels exhibited higher mechanical properties than austenitic stainless steels. In terms of corrosion resistance, super stainless steels exhibited lower passive current density(2.3~3.8 ㎂/cm2) than pure Ti(6.6 ㎂/cm2) in the body-simulated solution and similar potentiodynamic polarization behaviors. Pitting corrosion occurred in 316L S.S. but not in the others.
 
Thus these steels were considered to have high corrosion resistance in the human body.
In terms of cytotoxicity, SR-50A and SAF2507 exhibited none cytotoxicity and the others slight. This results indicated that the cytotoxicity of alloys containing nickel had no relation with nickel content because SR-50A with the highest nickel content exhibited none cytotoxicity.
In conclusion, it is considered that super stainless steels with high corrosion resistance and good biocompatibility can be used for orthodontic applications because of the enhanced passive film by high addition of Mo, W, N, etc.


Key Words : super stainless steels, nickel content, passive film, cytotoxicity

J Korean Res Soc Dent Mater 30(3):241-253, 2003

주소 : 서울시 서대문구 신촌동 134 우편번호 120-752
         연세대학교 치과대학 치과생체재료공학 연구소. 김경남

ISSN: 1225-1631


* 이 논문은 2003년도 두뇌한국 21 사업 연세대학교 의과학 사업단. 기초의과학 연구센터 및 국가지정
 
연구실 사업에 의하여 지원되었음.



 

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