Effect of ammonium hexafluorosilicate application for arresting caries treatment without discoloration

目的：银二胺氟化物[ SDF：Ag（NH_3）_2F]在日本已被用于防龋。SDF由于银沉淀而斯泰内斯牙齿变黑。为克服这一缺点，我们应用六氟硅酸铵[ AHF：（NH_4）_2F_6]，观察了乳牙脱矿釉质和牙本质的颜色和结构变化。结果：AHF处理未引起可见变色。脱矿形成的牙釉质棱柱和牙本质小管被AHF沉积物覆盖。唾液浸泡组可见球形充满膜的结构。EDS分析显示，AHF应用对釉质没有有效的影响，但是，在没有人工唾液浸泡的情况下，在应用AHF的牙本质表面上检测到显著更高的F%和Ca/ P比。结论：AHF治疗显示出不引起牙齿变色的优点，然而，额外的研究来评估AHF治疗防龋的效果。

Objective : Silver diamine fluoride[ SDF : Ag(NH_3)_2F] has been used to arrest caries in Japan. SDF staines the teeth black due to silver precipitation. To overcome this drawback, ammonium hexafluorosilicate[ AHF :(NH_4)_2F_6] was applied and observed the changes on color and structures of demineralized enamel and dentin of primary teeth. Results : AHF treatment did not cause visible discoloration. Enamel prisms and dental tubules appeared by demineralization were covered with precipitates by AHF application. Spherical filled membranous structure was observed in the saliva soaking groups. The EDS analysis showed no effective influence with AHF application on enamel, however, significantly higher F% and Ca/ P ratio were detected on the AHF applied dentin surfaces without artificial saliva soaking. Conclusions : AHF treatment showed the virtue of being not to cause tooth-discoloration, however, additional study to evaluate the efficacy on arresting caries treatment by AHF.