汞合金作为牙科充填材料历来占有很大的比例,最近Waterstrat等人对不含汞的镓合金进行了很多研究。认为镓—钯—锡合金很有希望作为充填材料。镓合金的物理性能比汞合金优良,而且镓有显著的湿润性以及粘接性,能与牙齿边缘密合,大大减少了继发龋的产生率。著者的实验也证明镓合金充填硬化后仍然具有粘结力,其边缘渗漏也比汞合金少。关于镓合金的生物、化学性能Waters-trat和Swans等人在室温蒸馏水中作过浸泡实验,证明镓合金表面既没有变色也没有发生腐蚀,而且用鼠和狗的牙齿作了充填,结果相同,用人的牙齿作充填2个月后也未发现上述变化。Lyon在鼠的皮下作了组织包埋, Amalgams have historically accounted for a large proportion of dental fill materials and most recently Waterstrat et al. Have done much research on mercury-free gallium alloys. Gallium-palladium-tin alloys are promising as filling materials. The physical properties of gallium alloy better than the amalgam, gallium and have significant wettability and adhesion, close to the edge of the teeth, greatly reducing the incidence of secondary caries. The author's experiments also proved that the gallium alloy still has adhesive strength after filling and hardening, and the edge leaks less than the amalgam. About biological and chemical properties of gallium alloys Waters-trat and Swans et al. Conducted immersion experiments in distilled water at room temperature, demonstrating that the surface of the gallium alloy was neither discolored nor corroded, but also filled with the teeth of rats and dogs and the result was the same. After filling with human teeth for 2 months did not find the above changes. Lyon was tissue-embedded in the mouse's skin,