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过硼酸钠常用于牙齿漂白,有报告此药物可引起牙根颈部吸收,这是由于其释放的H_2O_2通过牙本质小管至牙根表面,引起局部pH值改变而造成的。本文作者测定含不同结晶水的过硼酸钠对漂白剂pH值的影响。将单结晶水过硼酸钠(MH)、三结晶水过硼酸钠(TRH)及四个结晶水的过硼酸钠(TH)分别与10％,15％,30％H_2O_2溶液或重蒸馏水混合(粉液比为2g:1 ml)。测定0,1小时,1天,3天,7天5个时间的pH值。结果:MH,TRH,TH与30％H_2O_2混合后pH值分别为8.7,7.0和7.5,随H_2O_2浓度降低,pH值显著上
Sodium perborate is commonly used in tooth bleaching. It has been reported that this drug causes root and neck absorption due to the release of H 2 O 2 from the dentinal tubules to the root surface, causing local pH changes. The authors determined the effect of sodium perborate containing different water of crystallization on the pH of bleach. Monohydrate sodium perchlorate (MH), trihydrate sodium perborate (TRH), and four crystalline water sodium perborate (TH) were mixed with 10%, 15%, 30% H 2 O 2 solution or double distilled water Liquid ratio of 2g: 1 ml). The pH values of 0, 1 hour, 1 day, 3 days, 7 days and 5 days were determined. Results: The pH values of MH, TRH, TH and 30% H 2 O 2 were 8.7, 7.0 and 7.5, respectively. With the decrease of H 2 O 2 concentration, the pH value was significantly