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首页> 外文期刊>Journal of oral rehabilitation >The release of ions by compomers under neutral and acidic conditions.
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The release of ions by compomers under neutral and acidic conditions.

机译：复合物在中性和酸性条件下释放离子。

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摘要

Three commercial compomers have been studied for their interaction with aqueous solutions (i.e. water at pH 5.9 and lactic acid at pH 2.7). Light-cured discs of these materials (12.8 diameter x 1 mm depth; Dyract AP, Compoglass F and F2000) were prepared and stored in 5 cm(3) of either water or lactic acid at pH 2.7. After 1 week, mass changes, pH changes and ion-release were determined. For the specimens stored in water, the effect of maturation under neutral conditions was studied by continuing storage for 3 months, followed by storage in lactic acid for a further week after which ion release and pH change were determined. Student's t-test was used to determine statistical significance of any changes observed. All three cured compomers absorbed water and altered the pH of the solutions, though this was statistically significant only in lactic acid. They were found to release Na, Ca, Sr, Al, Si, P and F ions, with greater amounts being released in acidic conditions than neutral ones. More fluoride wasreleased in acid than in water, but the proportion of free (uncomplexed) fluoride to bound (complexed) fluoride was much lower than in neutral conditions. This was attributed to the formation of strong complexes with aluminium. Maturing specimens for 3 months made very little difference to their interaction with the acid solution, except for the total release of fluoride, which was some two to three greater than from the immature specimens.
机译：已经研究了三种商业化的共聚体与水溶液（即pH 5.9的水和pH 2.7的乳酸）的相互作用。准备了这些材料的光固化光盘（直径12.8毫米x 1毫米深度; Dyract AP，Compoglass F和F2000），并将其存储在pH值为2.7的5 cm（3）的水或乳酸中。 1周后，测定质量变化，pH变化和离子释放。对于储存在水中的标本，通过连续储存3个月，然后在乳酸中储存另外一周，研究了中性条件下的成熟效果，然后测定了离子释放和pH值变化。学生t检验用于确定观察到的任何变化的统计显着性。所有三种固化的共聚体均吸收水并改变溶液的pH值，尽管这仅在乳酸中具有统计学意义。发现它们会释放Na，Ca，Sr，Al，Si，P和F离子，在酸性条件下会比中性离子释放更多的离子。酸释放出的氟化物比水中释放的更多，但是游离（未络合）的氟化物与结合（络合）的氟化物的比例远低于中性条件。这归因于与铝形成强络合物。 3个月的标本熟化对它们与酸溶液的相互作用影响不大，只是氟化物的总释放量比未成熟的标本大两到三倍。

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