Abstract
The purpose of this study was to investigate the clinical applicability of the combined cast restorations made by connecting the different types of dental alloys by using a new technique:the technique for connecting different types of alloys without soldering.In this technique the different types of alloys were cast into the mold separated by platinum foil simultaneously.The image of structures around the connected area was observed under the LM and SEM.In cases when 20K gold alloy or platinum gold alloy were used, their contact to platinum foil was observed to be readily fused without segregation.In case of Au-Ag-Pd alloy the connection was observed to be also excellent.In this case, however, the structural image observed under the LM and SEM showed that diffusions of some elements occurred between the platinum foil and the alloy.In all cases, porocities, oxide membrane or any other structural image which indicates the weakness of the connection were not observed.In addition this technique is very simple, therefore, this technique may be recommended for clinical applications.
