Department of Dental Physical Sciences, Barts and London School of Medicine and Dentistry, Francis Bancroft Building, Queen Mary University of London, Mile End, London, E1 4NS, UK.
J Mater Sci Mater Med. 2010 Feb;21(2):589-95. doi: 10.1007/s10856-009-3901-3. Epub 2009 Oct 23.
To compare the effect of ultrasonic setting with self curing on fluoride release from conventional and experimental dental glass ionomer cements. To compare hand mixed and capsule mixing and the effect of replacing some of the reactive glass with zirconia. In a novel material which advocated using radiant heat to cure it, to compare the effect of this with ultrasound. To evaluate the effect of ultrasound on a glass ionomer with fluoride in the water but not in the glass. 10 samples of each cement were ultrasonically set for 55 s; 10 controls self cured for 6 min. Each was placed in 10 ml of deionised water which was changed at 1, 3, 7, 14, 21, 28 days. The solution fluoride content was measured using a selective ion electrode. All ultrasound samples released more fluoride than the controls. Release patterns were similar; after a few days, cumulative fluoride was linear with respect to t(1/2). Slope and intercept of linear regression plots increased with ultrasound. With radiant heat the cement released less fluoride than controls. The effect of ultrasound on cement with F in water increased only slope not intercept. Zirconia addition enhances fluoride release although the cement fluorine content is reduced. Comparison of capsule and hand mixing showed no consistent effect on fluoride release. Ultrasound enhances fluoride release from GICs. As heat has an opposite effect the heat from ultrasound is not its only action. The lesser effect on cement with fluoride only in the water indicates that of ultrasound enhances fluoride release from glass.
比较超声调拌与自凝在常规和实验性牙科玻璃离子水门汀氟释放上的效果。比较手动混合和胶囊混合以及用氧化锆替代部分反应性玻璃的效果。在提倡使用辐射热固化的新型材料中，比较其与超声的效果。评估超声对含有氟但不含玻璃的玻璃离子水门汀的影响。将每种水门汀的 10 个样本进行超声调拌 55 秒；10 个对照样本自凝 6 分钟。将每个样本放入 10ml 去离子水中，分别在第 1、3、7、14、21、28 天更换溶液。采用选择性离子电极测量溶液中的氟含量。所有超声样本的氟释放量均高于对照样本。释放模式相似；几天后，累积氟与 t(1/2)呈线性关系。线性回归图的斜率和截距随超声而增加。使用辐射热，水门汀的氟释放量低于对照样本。超声对水中含 F 的水门汀的影响仅增加斜率，而不增加截距。氧化锆的添加虽然降低了水门汀的氟含量，但能增强氟释放。胶囊混合和手动混合的比较没有显示出对氟释放的一致影响。超声增强玻璃离子水门汀的氟释放。由于热有相反的效果，超声的热不是其唯一作用。对仅含水中氟的水门汀的影响较小表明，超声增强了玻璃中的氟释放。
