Espevik S
Acta Odontol Scand. 1977;35(5):251-5. doi: 10.3109/00016357709019800.
The dimensional changes of dental amalgams during setting was evaluated using different methods of specimen production, and measurement procedures. Amalgam specimens were prepared from 10 commercially available dental amalgam alloys by mechanical condensation. Dimensional change was measured on microcators with a measuring load of 1 g. The variation in dimensional change with trituration was substantial, and similar to the difference between various brands of alloys at the same trituration time. Porosity seems to vary between 0.1 and 0.6% independent of severity of trituration except for two alloys in which increased trituration time seemed to reduce porosity. It was therefore pointed out that even though trituration in most cases can be altered to make an amalgam expand, such procedures should not be followed since optimal values of other clinically significant properties may not be maintained.
使用不同的标本制作方法和测量程序，对牙科汞合金凝固过程中的尺寸变化进行了评估。通过机械压实从10种市售牙科汞合金中制备汞合金标本。在测量负荷为1克的测微仪上测量尺寸变化。研磨引起的尺寸变化差异很大，与相同研磨时间下不同品牌合金之间的差异相似。除了两种合金，研磨时间增加似乎会降低孔隙率外，孔隙率似乎在0.1%至0.6%之间变化，与研磨程度无关。因此指出，尽管在大多数情况下可以改变研磨方式以使汞合金膨胀，但不应采用这种程序，因为可能无法维持其他临床显著特性的最佳值。
