The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)
- Volume 26 Issue 1
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- Pages.51-61
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- 1988
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- 0301-2875(pISSN)
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- 2005-3789(eISSN)
A Comparative Study on the Marginal Fit between Castable Ceramic(Dicor) Crowns and Metal-Ceramic Crowns
주조도재관과 도재전장주조관의 치경부 변연적합도에 관한 비교 연구
- Kim, Jeong-Ho (Department of Prosthodontics, College of Dentistry, Seoul National Unviersity) ;
- Yang, Jae-Ho (Department of Prosthodontics, College of Dentistry, Seoul National Unviersity) ;
- Lee, Sun-Hyung (Department of Prosthodontics, College of Dentistry, Seoul National Unviersity)
- Published : 1988.12.01
Abstract
The recently introduced castable glass ceramics incorporate properties characteristic of natural teeth and they are regarded as an ideal material to restore lost tooth structure. The purpose of this study was to compare the marginal fit of castable ceramic crown with that of the metal-ceramic crown in the process of heat treatment. Two master dies for castable ceramic crowns and metal-ceramic crowns were fabricated from being cast with the base metal. Each master die was duplicated with addition silicone and hard stone. Ten castable ceramic crowns were made on each hard stone die and their marginal openings were measured three times first, after casting; second, after ceramming; third, after shading. The other ten metal-ceramic crowns were made on each hard stone die and their marginal openings were measured three times : first, after casting; second, after degassing; third, after porcelain veneering. Each crown was seated on its master die with the constant force delivered by loading jig. And then, marginal openings were measured on four locations by optical projector at X50 magnification. The results were as follows: 1. The mean marginal openings of castable ceramic crowns were
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