The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
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A STUDY ON THE COLOR CHANCE OF CERAMIC BY Pd-Ag ALLOY AND MECHANISM

팔라디움-은합금에 의한 도재의 색조변화 및 변색작용에 관한 연구

  • Youn, Soo-Sun (Department of Prosthodontics, School of Dentistry, Seoul National University) ;
  • Lee, Sun-Hyung (Department of Prosthodontics, School of Dentistry, Seoul National University) ;
  • Yang, Jae-Ho (Department of Prosthodontics, School of Dentistry, Seoul National University) ;
  • Chong, Hun-Young (Department of Prosthodontics, School of Dentistry, Seoul National University)
  • 윤수선 (서울대학교 치과대학 치과 보철학교실) ;
  • 이선형 (서울대학교 치과대학 치과 보철학교실) ;
  • 양재호 (서울대학교 치과대학 치과 보철학교실) ;
  • 정헌영 (서울대학교 치과대학 치과 보철학교실)
  • Published : 1989.06.01
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Abstract

The purpose of this study was to investigate the tendency of color change of ceramic, and its mechanism un der the influence of Pd-Ag alloy. The specimens were made by firing porcelain on tile metal plates cast with Au-Pt alloy, Pd-Cu alloy and Pd-Ag alloy. In the case of Pd-Ag alloy, specimens were fired under three different conditions as follows, 1) without protection, 2) protection with ceramic metal conditioner, 3) protection with carbon block. For the specimens of element analysis, a barrier was constructed with platinum foil between metal plate and ceramic. Color change was measured with colorimeter and elemental changes in ceramic were calculated with DC argon plasma emission spectrophotometer. The results were as follows : 1. Color change of ceramic by Pd-Ag alloy was negligible in hue, but decreased in value and increased in chroma (yellow discoloration). 2. Color change of ceramic by Pd-Ag alloy was appeared through vapor transport mechanism. 3. As the protection method for the color change of ceramic by Pd-Ag alloy, application of ceramic metal conditioner was superior to utilization of carbon block.

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