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  • Title: Copper-free amalgams: dimensional change after approximately five years at 60, 37, and 23 degrees C.
    Author: Paffenbarger GC, Rupp NW, Patel PR.
    Journal: J Dent Res; 1982 Jun; 61(6):811-3. PubMed ID: 6953120.
    Abstract:
    Two copper-free amalgams expanded excessively after storage in air at 60 degrees C for about five yr. One expanded significantly at 37 degrees C and slightly at 23 degrees C. High silver content, absence of copper, and presence of small amounts of zinc, or all three, seemed to promote very high expansions at 60 degrees C.
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