The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
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A STUDY ON THE DISTORTION OF ETCHED BRIDGE DURING THE FIRING CYCLE

도재소성주기에 따른 식각가공의치의 변형에 관한 연구

  • Park, Hui-Un (Department of Prosthodontics, College of Dentistry, Seoul Nationl University) ;
  • Yang, Jae-Ho (Department of Prosthodontics, College of Dentistry, Seoul Nationl University) ;
  • Lee, Sun-Hyung (Department of Prosthodontics, College of Dentistry, Seoul Nationl University) ;
  • Chang, Wan-Shik (Department of Prosthodontics, College of Dentistry, Seoul Nationl University)
  • 박희운 (서울대학교 치과대학 보철학교실) ;
  • 양재호 (서울대학교 치과대학 보철학교실) ;
  • 이선형 (서울대학교 치과대학 보철학교실) ;
  • 장완식 (서울대학교 치과대학 보철학교실)
  • Published : 1986.12.01
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Abstract

The purpose of this study was to evaluate the distortion of 6-unit etched bridge during the firing cycle. Thirty frameworks were constructed. Twenty of the frameworks received a normal application of porcelain and firing sequence ; ten served as controls and subjected to the same firing sequence without the porcelain application. The results were as follows ; 1. Distortion did occur in the body of curved, long-span etched bridge frameworks during the porcelain firing cycle. 2. This distortion was a result of changes in the metal as well as the contraction of fired porcelain. 3. The greatest distortional changes occurred during the degassing stage and final glaze stage of the porcelain firing cycle. 4. Distortion incurred by the application and firing of the porcelain was reversible. When the porcelain was chemically removed from the frameworks, there was an elastic rebound. 5. Distortion was clinically important.

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