This study was made to compare the physical and chemical properties of amalgam with those of
gallium alloy in which the invented liquid
alloy containing the three fundamental components of Ga-Sn-In or Ga-Sn-In-Ag were used instead of
mercury. Experiment 1. The physical and chemical properties were investigated after the liquid
gallium alloy and high
copper amalgam
powder were mixed. The following results were obtained; 1) The invented
gallium alloy group showed expansion in dimensional changes immediately after mixing. This
alloy group showed the same compressive and diametral tensile strength as those in amalgam after 7 days. 2) This
alloy group showed slightly more corrosion
weight loss in 0.05% HCl and 1%
lactic acid solutions than that in amalgam, but this
alloy group showed the same corrosion
weight loss in 1% NaCl
solution and
artificial saliva as in amalgam. Also this
alloy group showed more discoloration (delta E, NBS) in 0.1%
Na2S solution than that in amalgam, but this showed the same degree of discoloration in
artificial saliva. Experiment 2. The physical and chemical properties were investigated after the same liquid
gallium alloy and Ag-Pd-Sn-Cu-Zn
alloy powder were mixed. The following results were obtained; 1) The invented
gallium alloy group showed expansion in dimensional changes immediately after mixing. This showed superior quality in compressive and diametral tensile strength as compared with those of amalgam. 2) The invented
gallium alloy showed slightly more corrosion
weight loss in 0.05% HCl and 1%
lactic acid solutions than that in amalgam, but this
alloy group showed the same corrosion
weight loss in 1% NaCl
solution and
artificial saliva as in amalgam. Also this
alloy group showed more discoloration (delta E, NBS) in 0.1%
solution than that in amalgam, but it was the same in
artificial saliva.