国内外人群患龋齿率很高。目前使用的修复牙体缺损最常用的材料仍为银汞合金,它作为一种永久性修复材料,在口腔内存在几年、几十年至终身。汞是有毒金属,填补龋洞用的银汞合金对人体是否有害,一些报刊杂志文章说法不一。我们说银汞合金补牙无损健康,其理由得从成分、操作和防护谈起。 银汞合金材料的成份,银占总量的40％～60％,是增强银汞合金强度的主要成分,但不易与汞结合,亦无毒性;锡占27％～30％,在银汞合金中形成锡化银,锡与汞的 People at home and abroad suffering from dental caries high rates. Currently used to repair dental defects is the most commonly used material is amalgam, which is used as a permanent repair material in the mouth for several years, decades to life. Mercury is a poisonous metal. It is harmful to the human body to fill the amalgam used in caries holes. Some articles in newspapers and magazines have different opinions. We say that amalgam fillings are non-destructive and justify the ingredients, handling, and protection. Silver amalgam material composition, silver accounts for 40% to 60% of the total, is to enhance the strength of amalgam the main ingredient, but not easy to combine with mercury, nor toxic; tin accounted for 27% to 30%, in the amalgam In the formation of silver silver, tin and mercury