Abstract
An amalgam alloy, namely Lumi Alloy was investigated by X-ray microprobe and X-ray diffraction analysis.It was found that there were two different compositions.One was roughly composed of Ag 47wt%, Sn 33wt% and Cu 21wt%.The other was roughly Ag 59wt%, Sn 30wt% and Cu 11wt%.The alloy seemed to consist of γ(Ag3Sn)and Cu3Sn.Quick reaction of this alloy with mercury was observed.Amalgam made from this alloy exhibited a matrix of γ1(Ag2Hg3)with small reaction phase areas of Cu6Sn5.The γ2(Sn7-8Hg)was detected in amalgam an initial period of time.But this phase seemed to disappear as time elapsed.The surface structural changes were not marked after immersion in synthetic saliva.
