Paffenbarger G C, Rupp N W, Patel P R
J Am Dent Assoc. 1979 Sep;99(3):468-71. doi: 10.14219/jada.archive.1979.0331.
Copper-rich amalgams made from alloy mixtures have large expansions in air at 105 +/- 2 weeks that range from 100 to 194 micrometers/cm at 60 C, from 36 to 101 micrometers/cm at 37 C, and from 14 to 44 micrometers/cm at 23 C on unrestricted 8- x 4-mm cylinders (Dispersalloy, Micro II, and Optaloy II). Other copper-rich amalgams made from one alloy usually had a slight shrinkages at the three temperatures with an exception, a slight expansion of 12 micrometers/cm at 60 C (Aristaloy CR, Indilogy non-zinc, Sybraloy, and Tytin). Dimensional changes during hardening ranged,on the average, from -3 to +19 micrometers/cm when measured by ADA Specification methods and from -2 to +25 micrometers/cm when measured by an indirect method. The clinical significance of the foregoing findings is unknown; nor is a relationship known among dimensional change of unrestricted specimens, dimensional change of restricted specimens, creep value, and clinical behavior of amalgams generally. In specific instances, however, a relationship is sometimes shown.
由合金混合物制成的富铜汞合金，在105±2周龄时于空气中会有较大膨胀，在60℃时，8×4毫米无限制圆柱体（Dispersalloy、Micro II和Optaloy II）的膨胀范围为100至194微米/厘米，在37℃时为36至101微米/厘米，在23℃时为14至44微米/厘米。由单一合金制成的其他富铜汞合金在这三个温度下通常有轻微收缩，但有一个例外，即Aristaloy CR、Indilogy无锌、Sybraloy和Tytin在60℃时有12微米/厘米的轻微膨胀。按照ADA规范方法测量，硬化过程中的尺寸变化平均为-3至+19微米/厘米，采用间接方法测量时为-2至+25微米/厘米。上述发现的临床意义尚不清楚；一般而言，无限制试样的尺寸变化、受限试样的尺寸变化、蠕变值和汞合金的临床行为之间的关系也不清楚。然而，在特定情况下，有时会显示出一种关系。
