The Comparative Study on the Castability to the Frequency of Reuse with Precious Metal Alloys and Base Metal Alloys widely used in the Production of Partial Denture

국부의치(局部義齒) 제작(製作)에 사용(使用)되는 귀금속합금(貴金屬合金)과 비귀금속합금(非貴金屬合金)의 재(再) 사용(使用) 횟수에 따른 주조성(鑄造性) 비교(比較) 연구(硏究)

The purpose of this study is to get the difference of the castability in the production of partial denture between Precious Metal Alloys and Base Metal Alloys accompanied with the frequency of reuse. As materials for an experiment, we selected Baker-444 and Soo-444 and Soo-sung as Precious Metal Alloys, New Crown and Chrome Cobalt as Base Metal Alloys. And we tired to case all of them seven times. The experimental results were as follows : 1) In the probability of segments, Baker-444 showed 100$\pm$0.00%, Soo-sung 97.24$\pm$1.58%, New Crown 95.63$\pm$4.28%, and Chrome Cobalt 91.03$\pm$7.76%. Consequently, Precious Metal Alloys were decidely superior to Base Metal Alloys in the castability. 2) In the view of the acheived result, burn-out temperature and smocking time had greatly affected the castability. 3) After casting, Precious Metal Alloys were much less than Base Metal Alloys in the quantity of consumption. It made much difference from the the compiled stastics(p<0.01)