Abstract
The accuracy of silver-plated dies as compared with that of stone dies was investigated using a silicone impression material, Xantopren, and a polysulfide material, Permlastic. A revised method of metallizing the surface of the Xantopren was used which yielded dies with a satisfactory plating of silver. The following conclusions were made from the results of this investigation. 1. Primary stone dies from Xantopren impressions are more accurate than primary or backup silver-plated dies from Xantopren impressions. 2. There is no significant difference in accuracy between primary stone dies and primary silver-plated dies from Permlastic impressions. 3. Secondary silver-plated dies are less accurate than primary stone dies or primary silver-plated dies from Permlastic impressions.
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