过氧化氢和过氧化脲是常用的牙齿漂白药物,局部应用相对安全,对全身副作用不大。近年来,有学者发现它能使牙科汞合金表面汞水平升高,而在漂白溶液中不存在汞。本研究目的是测定和比较10％过氧化脲对4种牙科汞合金汞释放的作用能力。 材料和方法 4种商业用牙科汞合金:Megaloy、Megat、Nongama 2、Valiant Pb.D,各取16个样本调拌后压缩至带有10mm×5mm×3mm洞腔的硅酸盐印模中,60min后,生理盐水冲洗。16个样本随机 Hydrogen peroxide and urea peroxide are commonly used tooth bleaching drugs, which are relatively safe for topical application and have little side effect on whole body. In recent years, some scholars have found that it can make the level of mercury on the dental amalgam surface increased, but there is no mercury in the bleaching solution. The purpose of this study was to determine and compare the ability of 10% urea peroxide to release mercury from four dental amalgams. MATERIALS AND METHODS Four commercial dental amalgams, Megaloy, Megat, Nongama 2, and Valiant Pb.D, were each 16 samples mixed and compressed into a silicate impression with a 10 mm x 5 mm x 3 mm cavity. After 60 minutes, wash with saline. 16 samples are random