Itota Toshiyuki, Al-Naimi Omar T, Carrick Thomas E, Yoshiyama Masahiro, McCabe John F
Dental Materials Science Unit, School of Dental Sciences, University of Newcastle upon Tyne, Newcastle upon Tyne, UK.
Dent Mater. 2005 Nov;21(11):1033-8. doi: 10.1016/j.dental.2004.11.008.
The aim of this study was to evaluate the fluoride release from aged resin composites containing different types of fluoridated glass filler into both deionized distilled water and lactic acid solution.
Three resin composites, UniFil S (containing fluoro-alumino-silicate glass filler), Reactmer (containing pre-reacted glass-ionomer filler) and Beautifil (containing both types of fillers) were used. A conventional glass-ionomer cement, Ketac-Fil, was used as a control. Five disk specimens of each material were prepared and aged in water for 10 weeks. After aging, specimens were immersed in deionized distilled water for a further 6 days and then in aqueous lactic acid (pH 4.0) for 2 days. This process was repeated twice more and the specimens were subsequently immersed in water for a further 12 days. Fluoride release was measured every 2 days throughout the post-aging period.
The amount of fluoride release for aged UniFil S and Beautifil markedly increased in acid solution compared with water storage. The difference was not so great for aged Reactmer and Ketac-Fil. UniFil S and Beautifil gave significantly greater fluoride release in water following immersion in acid solution (p<0.05, two-way ANOVA and Scheffe's test), but Reactmer and Ketac-Fil showed no such increase in fluoride release after acid immersion.
These results suggested that the nature of the fluoridated glass filler within a resin composite and the way in which the material interacts with an acidic environment affected the amount of fluoride released.
本研究旨在评估含有不同类型含氟玻璃填料的老化树脂复合材料在去离子蒸馏水中和乳酸溶液中的氟释放情况。
使用了三种树脂复合材料，即UniFil S（含氟铝硅酸盐玻璃填料）、Reactmer（含预反应玻璃离子填料）和Beautifil（含两种填料）。一种传统的玻璃离子水门汀Ketac-Fil用作对照。每种材料制备五个圆盘试样，并在水中老化10周。老化后，试样再在去离子蒸馏水中浸泡6天，然后在pH值为4.0的乳酸水溶液中浸泡2天。此过程再重复两次，随后试样再在水中浸泡12天。在整个老化后阶段，每2天测量一次氟释放量。
与在水中储存相比，老化后的UniFil S和Beautifil在酸性溶液中的氟释放量显著增加。老化后的Reactmer和Ketac-Fil的差异没有那么大。在酸性溶液中浸泡后，UniFil S和Beautifil在水中的氟释放量显著更高（p<0.05，双向方差分析和谢弗检验），但Reactmer和Ketac-Fil在酸性浸泡后氟释放量没有这种增加。
这些结果表明，树脂复合材料中含氟玻璃填料的性质以及材料与酸性环境相互作用的方式会影响氟的释放量。
