The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)
- Volume 28 Issue 1
- /
- Pages.165-191
- /
- 1990
- /
- 0301-2875(pISSN)
- /
- 2005-3789(eISSN)
INFLUENCE OF COOLING RATE ON THERMAL EXPANSION BEHAVIOR AND FLEXURAL FAILURE OF PFM SYSTEMS
도재 냉각방법의 차이가 금속-도재간 열팽창 양상과 결합력에 미치는 영향
- Lim, Ae-Ran (Department of Prosthodontics, College of Dentistry, Kyung Hee University) ;
- Lim, Ho-Nam (Department of Prosthodontics, College of Dentistry, Kyung Hee University) ;
- Park, Nam-Soo (Department of Prosthodontics, College of Dentistry, Kyung Hee University)
- Published : 1990.06.01
Abstract
Although a number of studies have been performed to assure that residual stress caused by a mismatch of alloy porcelain thermal expansion can contribute to clinical failure of a ceramometal restoration, the interactive influence of cooling rate on the magnitude of thermal expansion difference and on bond strength between them have not been extensively analyzed. The objective of this study was to determine the influence of cooling rate and the number of firing cycles on the expansion mismatch and the flexural failure resistance of metal porcelain strip. Tested alloys included one Pd-Ag alloy, one Ni-Cr-Be alloy with two kinds of porcelain, Vita and Ceramco. Metal specimens were cast into rods with a height of 13mm and a diameter of 5mm. Subsequently, the castings were subjected to scheduled firing cycles without porcelain. And the porcelain specimens after being fired were trimmed into a bar with a final dimension of
Keywords