Czarnecka Beata, Nicholson John W
Department of Biomaterials and Experimental Dentistry, Poznan University of Medical Sciences, Poznan, Poland.
J Dent. 2006 Sep;34(8):539-43. doi: 10.1016/j.jdent.2005.08.007. Epub 2006 Feb 28.
This study was undertaken to gain a fuller picture of the interaction of resin-modified glass-ionomers with aqueous solutions in terms of water sorption, solution buffering and ion-release.
Two commercial materials were employed (Fuji II LC, GC; Photac Fil Quick, 3M ESPE). Light-cured cylindrical specimens (6mm highx4mm diameter) were prepared and stored for up to 6 weeks in either water (pH 5.3) or aqueous lactic acid (2.7), six specimens of each materials per storage medium. Solutions were changed at weekly intervals. Specimens were weighed at weeks 1, 2, 4 and 6; solution pH values measured, and Na, Ca, Sr, Al, P and Si ion release determined using ICP-OES. Results were analysed by ANOVA.
Materials altered solution pH, and gained mass under all conditions. However, the net mass gain in lactic acid declined with time, suggesting that water sorption was partly offset by erosion under acid conditions. Na, Ca, Sr, Al, P and Si were detected in all solutions, with greater amounts in lactic acid than in water. Phosphorus release was much lower than found previously for conventional glass-ionomers.
Like their conventional counterparts, resin-modified glass-ionomers have been found to buffer their storage media and release ions. Hence the resin phase does not significantly alter these aspects of the interaction with aqueous solutions.
本研究旨在从吸水、溶液缓冲和离子释放方面更全面地了解树脂改性玻璃离子水门汀与水溶液的相互作用。
使用两种市售材料（富士II LC，GC公司；Photac Fil Quick，3M ESPE公司）。制备光固化圆柱形试件（高6mm×直径4mm），并在水（pH 5.3）或乳酸水溶液（2.7）中储存长达6周，每种材料每种储存介质制备6个试件。溶液每周更换一次。在第1、2、4和6周对试件称重；测量溶液pH值，并使用电感耦合等离子体发射光谱仪（ICP-OES）测定钠、钙、锶、铝、磷和硅离子的释放量。结果采用方差分析进行分析。
材料改变了溶液pH值，且在所有条件下均增加了质量。然而，在乳酸中的净质量增加随时间下降，这表明在酸性条件下，吸水部分被侵蚀抵消。在所有溶液中均检测到钠、钙、锶、铝、磷和硅，乳酸中的含量高于水中。磷的释放量远低于先前对传统玻璃离子水门汀的研究结果。
与传统玻璃离子水门汀一样，树脂改性玻璃离子水门汀已被发现可缓冲其储存介质并释放离子。因此，树脂相不会显著改变与水溶液相互作用的这些方面。
