OBJECTIVE To determine the effect of storage temperature and the presence of sodium chloride in solution on the fluoride uptake and release of glass-ionomer cements. METHODS Several commercial brands were used, and stored at either room temperature (21-23°C) or 37°C, in KF solution at a concentration of 1000ppm F- with and without 0.9% NaCl present. Fluoride levels in the storage solutions after 24h were measured using a fluoride-ion selective electrode. Specimens were then stored in water, and fluoride release after 24h was determined. Studies were also carried out to determine chloride levels when specimens were stored in 0.9% NaCl, with or without 1000 ppm fluoride, again using an ion selective electrode. RESULTS All glass-ionomer specimens took up fluoride, and most of the fluoride was retained over the next 24 h when the specimens were stored in water. There was a slight variation in the amount of fluoride taken up with storage temperature and with the presence of sodium chloride. All specimens also took up chloride, with greater uptake at higher temperatures, but little or no effect when KF was also present in solution. SIGNIFICANCE The substantial retention of fluoride after 24h in deionised water confirms previous findings and suggests that an insoluble species, possibly SrF2, forms in situ. Chloride uptake has not been reported previously, and its significance requires further investigation. Fluoride and chloride uptake were apparently independent of each other, which suggests that the ions are taken up at different sites in the cement. This may relate to differences in the respective sizes and hydration states of F- and Cl- ions.

中文翻译：

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温度和离子溶质对玻璃离聚物水泥中氟化物释放和补给的影响。

目的确定储存温度和溶液中氯化钠的存在对氟离子对玻璃离聚物粘固剂吸收和释放的影响。方法使用了几种商品品牌，并在1000 F / F的浓度（无和0.9％NaCl的存在）下于KF溶液中于室温（21-23°C）或37°C下储存。使用氟化物离子选择电极测量24小时后储存溶液中的氟化物水平。然后将样品储存在水中，并测定24小时后的氟化物释放量。再次使用离子选择电极，将样品保存在0.9％NaCl中（含或不含1000 ppm氟化物）时，还进行了测定氯含量的研究。结果所有玻璃离聚物样品都吸收了氟化物，当将标本存放在水中时，大部分氟化物会在接下来的24小时内保留下来。在储存温度和存在氯化钠的情况下，氟化物的吸收量略有变化。所有标本也吸收了氯化物，在较高的温度下吸收量更大，但是当溶液中也存在KF时，其吸收作用很小或没有。意义在去离子水中24小时后，氟化物的大量保留证实了先前的发现，并表明不溶性物质（可能是SrF2）在原位形成。以前没有关于氯离子吸收的报道，其重要性需要进一步研究。氟离子和氯离子的吸收显然是相互独立的，这表明离子在水泥中的不同位置吸收。