易熔合金简称硬铅,在使用中易受空气中的粉尘及其它杂质污染,同时当温度过高时会产生一些氧化物。不纯净的易熔合金在翻制模型时常出现一些夹杂、裂隙或气泡,而直接影响模型的精度和冲压强度,使锤造冠或修复体变形,报废。通常均把这些氧化物余渣清除,但这些被清除的余渣含易熔合金约78.58％,长年抛弃将会避成不小浪费。我们利用口腔科常用碎蜡来去除这些余渣。其方法是:将上述含有余渣的易熔合金置于熔金锅里,加入适量碎蜡(以熔化的蜡油刚湿 Fusible alloy, referred to as hard lead, is easily contaminated with dust and other impurities in the air during use. At the same time, some oxides are produced when the temperature is too high. Incomplete fusible alloys often have some inclusions, fissures or bubbles in the turning model, which directly affect the precision and stamping strength of the model so that the hammer crown or prosthesis can be deformed and discarded. These oxides are usually removed residue, but these are cleared residue containing fusible alloy about 78.58%, long-term abandon will avoid a lot of waste. We use the commonly used dental paraffin broken wax to remove these residues. The method is: the above residue containing fusible alloy placed in the melting pot, adding an appropriate amount of broken wax (melted wax just wet