Journal of Technologic Dentistry (대한치과기공학회지)

Korean Academy of Dental Technology (대한치과기공학회)
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Comparison of internal porosity of dental titanium castings with different casting machines

주조방식에 따른 티타늄 주조체의 내부결함 비교

  • Lee, Kyung-Eun (Dept. of Dental Lab. Science, Graduate School of Health Science, Catholic University of Pusan) ;
  • Kim, Bu-Sob (Dept. of Dental Lab Science, Catholic University of Pusan) ;
  • Chung, In-Sung (Dept. of Dental Lab Science, Catholic University of Pusan)
  • 이경은 (부산가톨릭대학교 보건과학 대학원) ;
  • 김부섭 (부산가톨릭대학교 보건과학대학 치기공학과) ;
  • 정인성 (부산가톨릭대학교 보건과학대학 치기공학과)
  • Published : 2007.12.01
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Abstract

The purpose of this study was to evaluate the titanium castability (internal porosity) between pressure type casting machine & centrifugal casting machine with air-vent or not. Internal porosity is a well-known problem in dental titanium casting, resulting in inferior mechanical properties of dental restorations. To evaluate the castability, the square plate was chosen. 40 plate patterns($20{\times}20{\times}1.8mm$)were attached to funnel-shaped sprue. Then 20 plate patterns were attached air-vent. They were invested in titanium investment material and cast in a pressure type casting machine(20castings) and centrifugal casting machine(20castings). Each group were divided with air-vent(10castings) or not(10castings). The titanium castings were evaluated by radiographic photograph for the location of the internal porosities. The percentage porosity of each specimen was determined using standardized digital radiographs. The results were analyzed with analysis of variance and t-test for paired comparison between two groups.

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