Abstract
A Cr-Co-Ni series of alloys, with additives of other elements, were formulated, and their mechanical properties were obtained. The major improvement, for dental purposes, was obtained by decreasing both the molybdenum and the carbon contents. When compared with regular alloys, the new alloys possessed a high elongation value, and the ultimate tensile strengths remained high. However, the hardness was lower. The benefits of these alloys may be summarized as follows: 1. Partial denture clasps could last longer. 2. The reduced hardness eases the grinding and, combined with higher elongation, facilitates adjustment of the partial dentures. This in turn will shorten the chair time of the dentist at the time of delivery. 3. The wear on natural teeth caused by contact with this alloy may be reduced.
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