眾鑄造時為了保證完整性，需要投入比實際使用量更多的合金，但為了降低復物製作成本，鑄道及底座處殘留的貴金屬或半貴金屬一般會被再利用。本研究目的在比較不同鎔鑄次數的Pd-Ag合金表面金相結構及元素組成。將Pd-Ag合金（Pors-on 4,德國, DeGuDent）依廠商說明進行四次鎔鑄，按照鎔鑄次數分為四組。用SEM/EDS分析樣本表面Pd、Ag、Sn、In、Zn元素的相對含量。在金相顯微鏡下觀察合金表面金相結構。 In元素在第四代合金中顯著減少，Zn元素在第三代合金中顯著減少。金相顯微鏡下，四代合金間未見明顯表面微結構改變。

For cast reasons it has become daily practice for dental technicians to mix already cast material with new alloy and to use that to perform dental work. The aim of this study is to evaluate the influence of recasting on compositional stability of a palladium-silver alloy. A commercial Pd-Ag alloy was cast and three times recast. An elemental analysis was performed with X-ray energy dispersive spectroscopy. The microstructure of the recast alloys was observed with a metalloscope. The concentration of In and Zn decreased slightly with recasting.