도재소부전장주조관(陶材燒付前裝鑄造冠)에 사용(使用)되는 각종(各種) 합금(合金)의 주조성(鑄造性)에 관(關)한 비교연구(比較硏究)

COMPARATIVE STUDY ON THE CASTABILITY OF VARIOUS ALLOYS FOR PORCELAIN-FUSED-TO-METAL CROWN

To compare the castability of various alloys popularly used in Korea for porcelain-fused-to-metal restorations, author selected Degudent G as precious alloy, J.P. 92 as semiprecious alloy and Vera Bond, Rexillium III, Unit Bond, Fine Bond as non precious alloys. With nylon lines and gauge waxes, author made the wax patterns for the castability comparison test. In the same conditions, wax patterns were invested, burned out and cast. Author obtained the following results from this study. 1. The castability of Degudent G as precious alloy for porcelain-fused-to-metal crown and bridge was the best of all. 2. The castability of nonprecious alloys was less than Degudent G as precious alloy, but their differences were not large. 3. The castability of Rexillium III is the best of all nonprecious alloys and that of Vera Bond, Unit Bond had nearly the same results. 4. Semiprecious alloy (J.P. 92) was less castable than nonprecious alloys.