The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
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CORROSION CHARACTERISTICS BETWEEN IMPLANT FIXTURE AND ABUTMENT SCREW

임플랜트 고정체와 지대나사간의 부식특성에 관한 연구

  • Kee, Su-Jin (Department of Prosthodontics, College of Dentistry, Chosun University) ;
  • Kweon, Hyeog-Sin (Department of Prosthodontics, College of Dentistry, Chosun University) ;
  • Choe, Han-Cheol (Department of Iron-manufacture and metallogical engineering, Kwang-Yang University)
  • 기수진 (조선대학교 치과대학 치과보철학교실) ;
  • 권혁신 (조선대학교 치과대학 치과보철학교실) ;
  • 최한철 (광양대학교 제철금속학과)
  • Published : 2000.02.01
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Abstract

The purpose of this study was to compare the corrosion characteristics between implant fixture and two types of abutment screw ; gold screw, titanium screw. The anodic polarization behavior, the galvanic corrosion behavior, and the crevice corrosion behavior of prepared samples were investigated using potentiostat and scanning electron microscope. The results were as follows: 1. Anodic polarization behavior of samples; The primary passivation potential of implant fixture was -420mV, implant abutment was -560mV. titanium screw was -370mV and gold screw was -230mV. All samples were shown to have a high corrosion potential and good formation of passive film. The critical passive current density of gold screw was higher than that of other samples and the sample of gold screw showed a unstable passive film formation at passive region. 2. Galvanic corrosion behavior of samples; Contact current density between implant fixture and titanium screw showed $8.023{\times}10^{-5}C/cm^2$. Contact current density between implant fixture and gold screw showed $5.142{\times}10^{-5}C/cm^2$. 3. Crevice corrosion behavior of samples; The crevice corrosion resistance of sample using titanium screw was higher than that of sample using gold screw, and a severe corrosion morphologies were observed at the fixture-screw interface by the scanning electron microscope.

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