Abstract
The purpose of this study was to establish an effective connecting method between wrought wire clasps and cast rests.
In this study, straight Co-Cr alloy wire samples connected by three different methods were evaluated with the tensile test and the bending test. The first method was the hightemperature (800°C) fusing method with Co-Cr alloy, the second one was the conventional soldering method using Ag alloy and the third was the newly developed room temperature fusing method using Co-Cr alloy.
Following results were obtained:
1) On room temperature fused samples about 80% of original wire strength were measured, while values of other were relatively small.
2) The deflection under the unit bending load was slightly smaller in room temperature fused samples and slightly larger in soldered samples than original clasp wires. High-temperature fused samples did not endure the bending stress and broke easily.
3) Mechanical properties of wrought wires hardly changed in the process of the room temperature fusing method.
From above mentioned results, the newly developed room temperature fusing method have great potentialities for clinical usage.
